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Voitto Haukisalmi - One of the best experts on this subject based on the ideXlab platform.
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molecular taxonomy and subgeneric classification of tapeworms of the genus moniezia blanchard 1891 cestoda Anoplocephalidae in northern cervids alces and rangifer
Parasitology International, 2018Co-Authors: Voitto Haukisalmi, Sauli Laaksonen, Antti Oksanen, Kimberlee B Beckmen, Ali Halajian, Tetsuya Yanagida, Minoru NakaoAbstract:Abstract Phylogenetic relationships of tapeworms of the genus Moniezia Blanchard, 1891 (Cestoda, Anoplocephalidae) parasitizing the Eurasian elk Alces alces, the moose A. americanus and the reindeer/caribou Rangifer tarandus (Cervidae) were studied using DNA sequences of two mitochondrial genes (cox1 and nad1). Several isolates from domestic ruminants, representing Moniezia expansa (Rudolphi, 1810) sensu lato and M. benedeni (Moniez, 1879) sensu lato, and one unidentified isolate from an African antelope, were also included in the analysis. Both genes identified the same six species of Moniezia, but interspecific phylogenetic relationships were better resolved by the nad1 data. The six species of Moniezia comprised two main clades: clade 1 that originates in bovids, with subsequent colonization of northern cervids in Eurasia, and clade 2 that originates in northern cervids, with subsequent specific divergence within these hosts. Clade 2 has a Holarctic distribution. None of the Moniezia specimens in Alces and Rangifer was conspecific with the species in domestic ruminants, suggesting that the custom of identifying Moniezia spp. in northern cervids either as M. expansa or M. benedeni is incorrect. At least two of the species parasitizing Alces and Rangifer have not been previously recognized. These findings challenge the results of all previous studies concerning the diversity and ecology of Moniezia spp. in northern cervids. The traditional classification into three subgenera (Moniezia Blanchard, 1891, Blanchariezia Skrjabin & Schultz, 1937 and Baeriezia Skrjabin & Schultz, 1937), based on the presence and type of interproglottidal glands, conflicts with the currently observed molecular phylogenetic relationships within the genus Moniezia.
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phylogenetic relationships and taxonomic revision of paranoplocephala luhe 1910 sensu lato cestoda cyclophyllidea Anoplocephalidae
Zootaxa, 2014Co-Authors: Voitto Haukisalmi, Eric P Hoberg, Lotta M Hardman, Heikki HenttonenAbstract:An extensive phylogenetic analysis and genus-level taxonomic revision of Paranoplocephala Luhe, 1910-like cestodes (Cyclophyllidea, Anoplocephalidae) are presented. The phylogenetic analysis is based on DNA sequences of two partial mitochondrial genes, i.e. cytochrome c oxidase subunit 1 ( cox1 ) and NADH dehydrogenase subunit 1 ( nad1 ), and includes 51 cestode isolates. The revision concerns all 34 Paranoplocephala -like species considered valid, of which 21 species could be included in the molecular phylogenetic analysis. Based on the phylogenetic relationships and main morphological features, with emphasis on the structure of the scolex, suckers and neck, length of the vagina (relative to the cirrus sac) and distribution of testes, 12 new genera are proposed for cestodes traditionally assigned to Paranoplocephala s. l. This results in 23 new combinations. The new genera are: Gulyaevia n. g., Chionocestus n. g., Microticola n. g., Beringitaenia n. g., Arctocestus n. g., Rauschoides n. g., Eurotaenia n. g., Douthittia n. g., Lemminia n. g., Tenoraia n. g., Rodentocestus n. g. and Cookiella n. g. In addition, Paranoplocephala (s. s.) and Parandrya Gulyaev & Chechulin, 1996 are redescribed; the latter genus is considered valid, although it has been earlier synonymized with Paranoplocephala . A new species ( Beringitaenia nanushukensis n. sp.) from Microtus miurus is described. Based on the DNA sequence data, several additional lineages probably representing independent species are identified, but not described as new taxa because of lack of good-quality specimens or absence of reliable morphological differences. The study also presents the first evidence for the phylogenetic position of the monotypic genus Gallegoides Tenora & Mas-Coma, 1978 based on DNA sequence data. A key for the Paranoplocephala -like genera is presented. The patterns of diversity and zoogeography of cestodes representing the “arvicoline clade” (72 species) are complex, involving mechanisms of dispersal, geographic colonization and host switching linking faunas across Eurasia and North America.
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afrojoyeuxia gen n and hunkeleriella gen n two new genera of cestodes cyclophyllidea Anoplocephalidae from african rodents
Folia Parasitologica, 2013Co-Authors: Voitto HaukisalmiAbstract:Abstract: Based on the study of type material, two new genera of cestodes (Cyclophyllidea: Anoplocephalidae) are proposed for Paranoplocephala Luhe, 1910 sensu lato species from African rodents. Afrojoyeuxia gen. n., proposed for A. gundii (Joyeux, 1923) comb. n. from Ctenodactylus gundi (Rothmann) (Hystricomorpha: Ctenodactylidae), is characterized by a high length/width ratio of mature proglottids, longitudinally extensive testicular field positioned anterior to the female glands, an ovoid or subspherical cirrus-sac and a thick, conical cirrus. Hunkeleriella gen. n., proposed for H. dasymidis (Hunkeler, 1972) comb. n. from Dasymys incomtus (Sundevall) (Myomorpha: Muridae), differs from related genera mainly by its short (10-20 mm) and wide strobila and neck, unilateral genital pores (exceptionally with a few changes per strobila), the position of the genital pores (slightly anterior to the middle of proglottid margin) and initially tube-like early uterus (later reticulated). Parandrya Gulyaev et Chechulin, 1996, earlier suggested to be a junior synonym of Paranoplocephala, is considered to be a valid, independent genus. Evidence of non-monophyly and need for a taxonomic revision of Paranoplocephala sensu lato, as well as the phylogenetic position of A. gundii and H. dasymidis are discussed.
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systematic relationships of mosgovoyia spasskii 1951 cestoda Anoplocephalidae and related genera inferred from mitochondrial and nuclear sequence data
Systematic Parasitology, 2010Co-Authors: Voitto Haukisalmi, Carlos Feliu, Lotta M Hardman, Pilar Foronda, Heikki HenttonenAbstract:The present study evaluates the phylogenetic position and systematic relationships of two species of Mosgovoyia Spasskii, 1951 and related genera (Cestoda: Anoplocephalidae) based on sequences of 28S ribosomal RNA and mitochondrial NADH dehydrogenase subunit 1 (Nad1) genes. Both molecular data-sets show that M. pectinata (Goeze, 1782) and Schizorchis caballeroi Rausch, 1960 are sister species and that they are phylogenetically independent from M. ctenoides (Railliet, 1890). This shows unambiguously that Mosgovoyia [sensu Beveridge (1978)] is a non-monophyletic assemblage, supporting the validity of Neoctenotaenia Tenora, 1976, erected for M. ctenoides. The results also show that the morphologically related Ctenotaenia marmotae (Frohlich, 1802) is the sister species of Andrya rhopalocephala (Riehm, 1881) and therefore represents a more derived lineage. Modified diagnoses are provided for Mosgovoyia and Neoctenotaenia.
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molecular systematics and morphometrics of anoplocephaloides dentata cestoda Anoplocephalidae and related species in voles and lemmings
Zoologica Scripta, 2009Co-Authors: Voitto Haukisalmi, Heikki Henttonen, Lotta M Hardman, Juha Laakkonen, Jukka Niemimaa, Michael Hardman, András GubányiAbstract:This study presents extensive molecular phylogenetic and morphometric data for Anoplocephaloides dentata (Galli-Valerio, 1905)-like cestodes (Anoplocephalidae) and related species parasitizing arvicoline rodents (voles and lemmings) in the Holarctic region. The molecular phylogeny is based on nucleotide sequences of cytochrome oxidase I (mtDNA) and 28S ribosomal RNA. Anoplocephaloides dentata-like cestodes included three main clades, two in western Eurasia and one in the Holarctic region (excluding western Eurasia). Three well-supported sublineages were included in the southern European clade, one of which represents the true A. dentata from Chionomys nivalis and sympatric Microtus arvalis and Dinaromys bogdanovi. These clades generally had non-overlapping distributions and showed a preference for certain host species. Multivariate analysis of morphometric data failed to discriminate unambiguously the various A. dentata-like lineages recovered in the molecular phylogeny, although two to three of the (sub)lineages were morphologically divergent. The overall evidence suggests, however, that instead of a single host-generalist species there are at least five more or less host-specific species of A. dentata-like cestodes. Colonization of new host lineages seems to have been the predominant mode of diversification, suggested by the considerable incongruence between host and parasite phylogenies at multiple taxonomic levels. Based on the results of the molecular survey, a redescription and neotype designation are provided for A. dentata.
Heikki Henttonen - One of the best experts on this subject based on the ideXlab platform.
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phylogenetic relationships and taxonomic revision of paranoplocephala luhe 1910 sensu lato cestoda cyclophyllidea Anoplocephalidae
Zootaxa, 2014Co-Authors: Voitto Haukisalmi, Eric P Hoberg, Lotta M Hardman, Heikki HenttonenAbstract:An extensive phylogenetic analysis and genus-level taxonomic revision of Paranoplocephala Luhe, 1910-like cestodes (Cyclophyllidea, Anoplocephalidae) are presented. The phylogenetic analysis is based on DNA sequences of two partial mitochondrial genes, i.e. cytochrome c oxidase subunit 1 ( cox1 ) and NADH dehydrogenase subunit 1 ( nad1 ), and includes 51 cestode isolates. The revision concerns all 34 Paranoplocephala -like species considered valid, of which 21 species could be included in the molecular phylogenetic analysis. Based on the phylogenetic relationships and main morphological features, with emphasis on the structure of the scolex, suckers and neck, length of the vagina (relative to the cirrus sac) and distribution of testes, 12 new genera are proposed for cestodes traditionally assigned to Paranoplocephala s. l. This results in 23 new combinations. The new genera are: Gulyaevia n. g., Chionocestus n. g., Microticola n. g., Beringitaenia n. g., Arctocestus n. g., Rauschoides n. g., Eurotaenia n. g., Douthittia n. g., Lemminia n. g., Tenoraia n. g., Rodentocestus n. g. and Cookiella n. g. In addition, Paranoplocephala (s. s.) and Parandrya Gulyaev & Chechulin, 1996 are redescribed; the latter genus is considered valid, although it has been earlier synonymized with Paranoplocephala . A new species ( Beringitaenia nanushukensis n. sp.) from Microtus miurus is described. Based on the DNA sequence data, several additional lineages probably representing independent species are identified, but not described as new taxa because of lack of good-quality specimens or absence of reliable morphological differences. The study also presents the first evidence for the phylogenetic position of the monotypic genus Gallegoides Tenora & Mas-Coma, 1978 based on DNA sequence data. A key for the Paranoplocephala -like genera is presented. The patterns of diversity and zoogeography of cestodes representing the “arvicoline clade” (72 species) are complex, involving mechanisms of dispersal, geographic colonization and host switching linking faunas across Eurasia and North America.
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systematic relationships of mosgovoyia spasskii 1951 cestoda Anoplocephalidae and related genera inferred from mitochondrial and nuclear sequence data
Systematic Parasitology, 2010Co-Authors: Voitto Haukisalmi, Carlos Feliu, Lotta M Hardman, Pilar Foronda, Heikki HenttonenAbstract:The present study evaluates the phylogenetic position and systematic relationships of two species of Mosgovoyia Spasskii, 1951 and related genera (Cestoda: Anoplocephalidae) based on sequences of 28S ribosomal RNA and mitochondrial NADH dehydrogenase subunit 1 (Nad1) genes. Both molecular data-sets show that M. pectinata (Goeze, 1782) and Schizorchis caballeroi Rausch, 1960 are sister species and that they are phylogenetically independent from M. ctenoides (Railliet, 1890). This shows unambiguously that Mosgovoyia [sensu Beveridge (1978)] is a non-monophyletic assemblage, supporting the validity of Neoctenotaenia Tenora, 1976, erected for M. ctenoides. The results also show that the morphologically related Ctenotaenia marmotae (Frohlich, 1802) is the sister species of Andrya rhopalocephala (Riehm, 1881) and therefore represents a more derived lineage. Modified diagnoses are provided for Mosgovoyia and Neoctenotaenia.
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molecular systematics and morphometrics of anoplocephaloides dentata cestoda Anoplocephalidae and related species in voles and lemmings
Zoologica Scripta, 2009Co-Authors: Voitto Haukisalmi, Heikki Henttonen, Lotta M Hardman, Juha Laakkonen, Jukka Niemimaa, Michael Hardman, András GubányiAbstract:This study presents extensive molecular phylogenetic and morphometric data for Anoplocephaloides dentata (Galli-Valerio, 1905)-like cestodes (Anoplocephalidae) and related species parasitizing arvicoline rodents (voles and lemmings) in the Holarctic region. The molecular phylogeny is based on nucleotide sequences of cytochrome oxidase I (mtDNA) and 28S ribosomal RNA. Anoplocephaloides dentata-like cestodes included three main clades, two in western Eurasia and one in the Holarctic region (excluding western Eurasia). Three well-supported sublineages were included in the southern European clade, one of which represents the true A. dentata from Chionomys nivalis and sympatric Microtus arvalis and Dinaromys bogdanovi. These clades generally had non-overlapping distributions and showed a preference for certain host species. Multivariate analysis of morphometric data failed to discriminate unambiguously the various A. dentata-like lineages recovered in the molecular phylogeny, although two to three of the (sub)lineages were morphologically divergent. The overall evidence suggests, however, that instead of a single host-generalist species there are at least five more or less host-specific species of A. dentata-like cestodes. Colonization of new host lineages seems to have been the predominant mode of diversification, suggested by the considerable incongruence between host and parasite phylogenies at multiple taxonomic levels. Based on the results of the molecular survey, a redescription and neotype designation are provided for A. dentata.
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Molecular systematics of the Holarctic Anoplocephaloides variabilis (Douthitt, 1915) complex, with the proposal of Microcephaloides n. g. (Cestoda: Anoplocephalidae)
Systematic Parasitology, 2008Co-Authors: Voitto Haukisalmi, Robert L Rausch, Lotta M Hardman, Michael Hardman, Heikki HenttonenAbstract:Phylograms based on mitochondrial cytochrome oxidase I gene sequences show that the Anoplocephaloides variabilis (Douthitt, 1915 )-like cestodes (Cestoda: Anoplocephalidae) from voles ( Microtus spp.) and Paranoplocephala krebsi Haukisalmi, Wickström, Hantula & Henttonen, 2001 from collared lemmings ( Dicrostonyx spp.) comprise a monophyletic group within the anoplocephaline cestodes. The patterns of phylogenetic, biological and/or biogeographical distinction suggest six or seven species of A. variabilis -like cestodes, including P. krebsi . However, at this time we decline to describe them as a series of new species as no straightforward morphological differences were found between the A. variabilis -like cestodes. A new genus, Microcephaloides n. g., is proposed for the cestodes earlier assigned to A. variabilis , A. cf. variabilis , A. tenoramuraiae Genov & Georgiev, 1988 and P. krebsi . A redescription is provided for the type-species, M. variabilis n. comb., from pocket gophers ( Geomys spp. and Thomomys spp.). In addition to Anoplocephaloides Baer, 1927 ( sensu stricto ) and Microcephaloides , Paranoplocephaloides Gulyaev, 1996 , Flabelloskrjabinia Spasskii, 1951 and Leporidotaenia Genov, Murai, Georgiev & Harris, 1990 are considered valid genera among cestodes previously assigned to Anoplocephaloides ( sensu Rausch, 1976 ). The host spectrum and present phylogenetic data suggest that Microcephaloides has been primarily associated with voles ( Microtus spp.) and its basal lineage now occurs in M. guentheri (Danford & Alston) in Turkey. Although the distribution and current host of the basal lineage suggest a western Palaearctic origin, subsequent diversification has probably occurred in eastern Beringia, because most of the more derived lineages occur partly or exclusively in Alaska.
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a taxonomic revision of the paranoplocephala primordialis douthitt complex cestoda Anoplocephalidae in voles and squirrels
Zootaxa, 2007Co-Authors: Voitto Haukisalmi, Heikki HenttonenAbstract:This study redescribes Paranoplocephala primordialis (Douthitt) in the red squirrel, Tamiasciurus hudsonicus , describes two new, related species of Paranoplocephala Luhe from Microtus and Myodes (syn. Clethrionomys ) voles, and summarizes the patterns of their host specificity and geographic distribution, particularly in Alaska and adjacent regions in Canada and north-eastern Siberia. Paranoplocephala nearctica n. sp. and Paranoplocephala alaskensis n. sp. are shown to be slightly, but consistently differentiated host-specific parasites of Myodes rutilus and Myodes gapperi, and Microtus miurus , respectively. The related Paranoplocephala sp. from Microtus oeconomus is also suspected to be specifically distinct, but the available material does not allow a description of a new species. Paranoplocephala primordialis -like cestodes occur widely in rodents in North America, ranging from California to Labrador and Alaska, but also in north-eastern Siberia. The specific identity of the few Eurasian specimens could not, however, be confirmed. Paranoplocephala primordialis -like species seem to be rare in all host species and regions, maximum prevalences being 8%, 3%, 6.5% and 5% for P. primordialis , P. nearctica n. sp., P. alaskensis n. sp. and Paranoplocephala sp., respectively.
Jordi Miquel - One of the best experts on this subject based on the ideXlab platform.
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MOSGOVOYIA CTENOIDES (CYCLOPHYLLIDEA: Anoplocephalidae), AN INTESTINAL PARASITE OF ORYCTOLAGUS CUNICULUS (LAGOMORPHA: LEPORIDAE)
2020Co-Authors: Catarina Eira, Jordi Miquel, Jose Vingadaf, Jordi TorresAbstract:Ultrastructural characters in spermiogenesis and spermatozoa are considered important tools to elucidate the phylo- genetic relationships within the Platyhelminthes. In the Anoplocephalidae, ultrastructural data refer to the spermatozoon of 14 species, whereas data on spermiogenesis refer to only 7 species. The present study focused on the spermiogenesis and sperma- tozoon of the anoplocephalid cestode Mosgovoyia ctenoides, as revealed by transmission electron microscopy. Type IV spermio- genesis was detected, beginning with the formation of a differentiation zone containing 2 centrioles, with a centriolar adjunct and vestigial striated rootlets. Different forms of the latter character have been described in other anoplocephalids. This study supports spermiogenesis of type IV as the most frequent in the Anoplocephalidae and confirms the presence of a centriolar adjunct in yet another type IV spermiogenesis species. The spermatozoon of M. ctenoides possesses 1 axoneme of the 9+T trepaxonematan type, 2 crestlike bodies, dense plates, and granules of electron-dense cytoplasmic material, nucleus, and twisted cortical microtubules. It was again confirmed that the presence of granular material and the absence of both a periaxonemal sheath and intracytoplasmic walls are constant characters in the spermatozoa of all the Anoplocephalinae. The complexity of the phylogenetic systematics of the Ces- toda has been previously emphasized (Brooks et al., 1991; Jus- tine, 1991; Mariaux, 1996). With respect to the Eucestoda, Hob- erg et al. (1997) used morphological and also spermatological characters to produce what was considered a robust hypothesis for interordinal relationships, which was largely corroborated by molecular methods (Mariaux, 1998). In several other studies, spermatological ultrastructure characters were considered to be important tools to elucidate the phylogenetic relationships with-
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spermatozoon ultrastructure of thysanotaenia congolensis cyclophyllidea Anoplocephalidae inermicapsiferinae phylogenetic implications
Parasitology Research, 2016Co-Authors: Jordi Miquel, Zdzislaw świderski, Carlos FeliuAbstract:The mature spermatozoon of Thysanotaenia congolensis, an intestinal parasite of black rat Rattus rattus from Cape Verde, is described by means of transmission electron microscopy. The ultrastructural organization of the sperm cell of T. congolensis follows Levron et al.’s type VII of the Eucestoda. It corresponds to a uniflagellate spermatozoon that presents crested bodies, periaxonemal sheath and intracytoplasmic walls, spiralled cortical microtubules and nucleus spiralled around the axoneme. These characteristics are also present in the spermatozoa of other inermicapsiferines and differ from the characters found in species belonging to the remaining subfamilies of anoplocephalids, namely Anoplocephalinae, Linstowiinae and Thysanosomatinae. Several authors consider the family Anoplocephalidae as a polyphyletic group, and its relationships with the Davaineidae are a matter of controversy. The phylogenetic implications of spermatological ultrastructural features present in inermicapsiferines and in the remaining anoplocephalids are discussed, and the available data on anoplocephalids are compared to similar results in davaineids in order to contribute to a better knowledge of relationships between these cyclophyllidean families.
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functional ultrastructure of the parenchymatic capsules of the cestode thysanotaenia congolensis cyclophyllidea Anoplocephalidae inermicapsiferinae
Parasitology Research, 2015Co-Authors: Zdzislaw świderski, Jordi Miquel, Carlos Feliu, David Bruce ConnAbstract:Proglottids from adult Thysanotaenia congolensis from naturally infected black rats Rattus rattus from Santiago Island, Cape Verde, were examined by transmission electron microscopy (TEM). The uterus in mature proglottids is composed of an ephemeral transverse tube or sac that breaks down, releasing eggs into the parenchyma where they are sequestered in groups and encapsulated by parenchymatous layers. In gravid proglottids, eggs accumulate in groups of 6–12 at the distal end of sac-like uterine ducts. As eggs accumulate, the end of the uterine ducts expands until it pinches off, releasing groups of eggs into the parenchyma surrounded by remnants of uterine epithelium. These epithelium-bound groups of eggs remain in the parenchyma until they are encapsulated with several parenchymatous layers, forming parenchymatic egg capsules, typical for mature and gravid proglottids of Inermicapsiferinae. The parenchymatic capsules originate from the medullary parenchyma of immature proglottids, which undergoes differentiation into the three layers of gravid proglottids: (1) an outer connective tissue layer composed of long delicate filaments of unknown chemical nature embedded in a granular extracellular matrix; (2) a middle layer appearing as an accumulation of large closely packed PAS-positive mucous goblets that are intensely metachromatic after toluidine blue staining and (3) an inner compact layer composed of lipid-containing cells, muscle cells with elongated muscle fibres and cells of various sizes and shapes forming or containing calcareous corpuscles. The mature hexacanths of T. congolensis are surrounded by reduced oncospheral envelopes consisting of remnants of a very thin membranous layer of degenerating embryophore with long, irregularly shaped cytoplasmic processes and by remnants of uterine epithelium extending as numerous apical microlamellae into the parenchymatic capsule lumen.
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Ultrastructure of spermiogenesis and mature spermatozoon of Angularella beema (Clerc, 1906) (Cestoda, Cyclophyllidea, Dilepididae)
Acta Parasitologica, 2006Co-Authors: Aneta Yoneva, Jordi Miquel, Zdzisław Świderski, Katia Georgieva, Yana Mizinska, Boyko B. GeorgievAbstract:The ultrastructure of the spermiogenesis of a dilepidid cestode species is described for the first time. The spermiogenesis of Angularella beema is characterised by absence of both flagellar rotation and proximodistal fusion. The differentiation zone is surrounded by cortical microtubules and is delimited by a ring of arching membranes. It contains two centrioles, one of which develops the axoneme that grows directly into the elongating cytoplasmic protrusion. This pattern of spermiogenesis was described as the Type IV spermiogenesis of cestodes. Among cestodes, similar pattern of spermiogenesis is known in the family Hymenolepididae and in some representatives of the family Anoplocephalidae. The mature spermatozoon of A. beema consists of five regions differing in their ultrastructural characteristics. It is characterised by the presence of cortical microtubules (spirally arranged at angle of 30–40° to the spermatozoon axis) and a single crested body. There is a periaxonemal sheath in certain parts of the spermatozoon as well as glycogen-like granules between the periaxonemal sheath and the cortical microtubules. The comparisons of the mature spermatozoon of A. beema with those of other two dilepidid species ( Dilepis undula and Molluscotaenia crassiscolex ) demonstrate some variation within the family: presence of periaxonemal sheath in A. beema and D. undula and its absence in M. crassiscolex ; presence of electron-dense rods in D. undula and their absence in A. beema .
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cellular organization of the oncosphere of mosgovoyia ctenoides cestoda Anoplocephalidae
Journal of Parasitology, 2006Co-Authors: Daniel Mlocicki, Jordi Miquel, Zdzislaw świderski, Catarina Eira, David Bruce ConnAbstract:The ultrastructure of the infective oncosphere of the cestode Mosgovoyia ctenoides (Anoplocephalidae) is described. The surface of the infective oncosphere is covered by a thin cytoplasmic layer of tegument connected by a narrow cytoplasmic process with the binucleate subtegumental cell, situated deeper in the body. Below the basal matrix of the cytoplasmic layer of the tegument are situated wide bands of the peripheral, somatic musculature responsible for body movements. The 3 pairs of hooks and their muscles form a complex hook muscle system, responsible for coordinated hook action. Five major types of cells have been distinguished: (1) a binucleate subtegumental cell, (2) a binucleate penetration gland, (3) 2 nerve cells, (4) numerous somatic cells, and (5) about 6 germinative cells. The approximate number of cells is 24 (26 nuclei, including 2 syncytial structures). The results of this study, when compared with other published reports from other cestode taxa, support previous hypotheses that the progr...
Carlos Feliu - One of the best experts on this subject based on the ideXlab platform.
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spermatozoon ultrastructure of thysanotaenia congolensis cyclophyllidea Anoplocephalidae inermicapsiferinae phylogenetic implications
Parasitology Research, 2016Co-Authors: Jordi Miquel, Zdzislaw świderski, Carlos FeliuAbstract:The mature spermatozoon of Thysanotaenia congolensis, an intestinal parasite of black rat Rattus rattus from Cape Verde, is described by means of transmission electron microscopy. The ultrastructural organization of the sperm cell of T. congolensis follows Levron et al.’s type VII of the Eucestoda. It corresponds to a uniflagellate spermatozoon that presents crested bodies, periaxonemal sheath and intracytoplasmic walls, spiralled cortical microtubules and nucleus spiralled around the axoneme. These characteristics are also present in the spermatozoa of other inermicapsiferines and differ from the characters found in species belonging to the remaining subfamilies of anoplocephalids, namely Anoplocephalinae, Linstowiinae and Thysanosomatinae. Several authors consider the family Anoplocephalidae as a polyphyletic group, and its relationships with the Davaineidae are a matter of controversy. The phylogenetic implications of spermatological ultrastructural features present in inermicapsiferines and in the remaining anoplocephalids are discussed, and the available data on anoplocephalids are compared to similar results in davaineids in order to contribute to a better knowledge of relationships between these cyclophyllidean families.
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functional ultrastructure of the parenchymatic capsules of the cestode thysanotaenia congolensis cyclophyllidea Anoplocephalidae inermicapsiferinae
Parasitology Research, 2015Co-Authors: Zdzislaw świderski, Jordi Miquel, Carlos Feliu, David Bruce ConnAbstract:Proglottids from adult Thysanotaenia congolensis from naturally infected black rats Rattus rattus from Santiago Island, Cape Verde, were examined by transmission electron microscopy (TEM). The uterus in mature proglottids is composed of an ephemeral transverse tube or sac that breaks down, releasing eggs into the parenchyma where they are sequestered in groups and encapsulated by parenchymatous layers. In gravid proglottids, eggs accumulate in groups of 6–12 at the distal end of sac-like uterine ducts. As eggs accumulate, the end of the uterine ducts expands until it pinches off, releasing groups of eggs into the parenchyma surrounded by remnants of uterine epithelium. These epithelium-bound groups of eggs remain in the parenchyma until they are encapsulated with several parenchymatous layers, forming parenchymatic egg capsules, typical for mature and gravid proglottids of Inermicapsiferinae. The parenchymatic capsules originate from the medullary parenchyma of immature proglottids, which undergoes differentiation into the three layers of gravid proglottids: (1) an outer connective tissue layer composed of long delicate filaments of unknown chemical nature embedded in a granular extracellular matrix; (2) a middle layer appearing as an accumulation of large closely packed PAS-positive mucous goblets that are intensely metachromatic after toluidine blue staining and (3) an inner compact layer composed of lipid-containing cells, muscle cells with elongated muscle fibres and cells of various sizes and shapes forming or containing calcareous corpuscles. The mature hexacanths of T. congolensis are surrounded by reduced oncospheral envelopes consisting of remnants of a very thin membranous layer of degenerating embryophore with long, irregularly shaped cytoplasmic processes and by remnants of uterine epithelium extending as numerous apical microlamellae into the parenchymatic capsule lumen.
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systematic relationships of mosgovoyia spasskii 1951 cestoda Anoplocephalidae and related genera inferred from mitochondrial and nuclear sequence data
Systematic Parasitology, 2010Co-Authors: Voitto Haukisalmi, Carlos Feliu, Lotta M Hardman, Pilar Foronda, Heikki HenttonenAbstract:The present study evaluates the phylogenetic position and systematic relationships of two species of Mosgovoyia Spasskii, 1951 and related genera (Cestoda: Anoplocephalidae) based on sequences of 28S ribosomal RNA and mitochondrial NADH dehydrogenase subunit 1 (Nad1) genes. Both molecular data-sets show that M. pectinata (Goeze, 1782) and Schizorchis caballeroi Rausch, 1960 are sister species and that they are phylogenetically independent from M. ctenoides (Railliet, 1890). This shows unambiguously that Mosgovoyia [sensu Beveridge (1978)] is a non-monophyletic assemblage, supporting the validity of Neoctenotaenia Tenora, 1976, erected for M. ctenoides. The results also show that the morphologically related Ctenotaenia marmotae (Frohlich, 1802) is the sister species of Andrya rhopalocephala (Riehm, 1881) and therefore represents a more derived lineage. Modified diagnoses are provided for Mosgovoyia and Neoctenotaenia.
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redescription of andrya cuniculi blanchard 1891 cestoda Anoplocephalidae a parasite of oryctolagus cuniculus lagomorpha in spain
Folia Parasitologica, 2002Co-Authors: František Tenora, Božena Koubková, Carlos FeliuAbstract:Andrya cuniculi (Blanchard, 1891) (Cestoda: Anoplocephalidae) is redescribed from Oryctolagus cuniculus (L.) from Spain. Large ranges of variability in body length and width, testes number and position of the cirrus sac were observed. An external seminal vesicle covered with small glandular cells is present. The pattern of development of the uterus is similar to that of Andrya rhopalocephala (Riehm, 1881). The only reliable differential characters to distinguish A. cuniculi from A. rhopalocephala are the position of the uterus in gravid segments and the position of the testes in mature segments. The uterus of A. cuniculi occupies the median field and parts of the lateral fields but is restricted to the median field in A. rhopalocephala. Testes are distributed more symmetrically lateral to the female organs in A. cuniculi but are mostly antiporal in A. rhopalocephala.
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functional ultrastructure of the parenchymatic capsules of the cestode thysanotaenia congolensis cyclophyllidea Anoplocephalidae inermicapsiferinae
Parasitology Research, 2015Co-Authors: Zdzislaw świderski, Jordi Miquel, Carlos Feliu, David Bruce ConnAbstract:Proglottids from adult Thysanotaenia congolensis from naturally infected black rats Rattus rattus from Santiago Island, Cape Verde, were examined by transmission electron microscopy (TEM). The uterus in mature proglottids is composed of an ephemeral transverse tube or sac that breaks down, releasing eggs into the parenchyma where they are sequestered in groups and encapsulated by parenchymatous layers. In gravid proglottids, eggs accumulate in groups of 6–12 at the distal end of sac-like uterine ducts. As eggs accumulate, the end of the uterine ducts expands until it pinches off, releasing groups of eggs into the parenchyma surrounded by remnants of uterine epithelium. These epithelium-bound groups of eggs remain in the parenchyma until they are encapsulated with several parenchymatous layers, forming parenchymatic egg capsules, typical for mature and gravid proglottids of Inermicapsiferinae. The parenchymatic capsules originate from the medullary parenchyma of immature proglottids, which undergoes differentiation into the three layers of gravid proglottids: (1) an outer connective tissue layer composed of long delicate filaments of unknown chemical nature embedded in a granular extracellular matrix; (2) a middle layer appearing as an accumulation of large closely packed PAS-positive mucous goblets that are intensely metachromatic after toluidine blue staining and (3) an inner compact layer composed of lipid-containing cells, muscle cells with elongated muscle fibres and cells of various sizes and shapes forming or containing calcareous corpuscles. The mature hexacanths of T. congolensis are surrounded by reduced oncospheral envelopes consisting of remnants of a very thin membranous layer of degenerating embryophore with long, irregularly shaped cytoplasmic processes and by remnants of uterine epithelium extending as numerous apical microlamellae into the parenchymatic capsule lumen.
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cellular organization of the oncosphere of mosgovoyia ctenoides cestoda Anoplocephalidae
Journal of Parasitology, 2006Co-Authors: Daniel Mlocicki, Jordi Miquel, Zdzislaw świderski, Catarina Eira, David Bruce ConnAbstract:The ultrastructure of the infective oncosphere of the cestode Mosgovoyia ctenoides (Anoplocephalidae) is described. The surface of the infective oncosphere is covered by a thin cytoplasmic layer of tegument connected by a narrow cytoplasmic process with the binucleate subtegumental cell, situated deeper in the body. Below the basal matrix of the cytoplasmic layer of the tegument are situated wide bands of the peripheral, somatic musculature responsible for body movements. The 3 pairs of hooks and their muscles form a complex hook muscle system, responsible for coordinated hook action. Five major types of cells have been distinguished: (1) a binucleate subtegumental cell, (2) a binucleate penetration gland, (3) 2 nerve cells, (4) numerous somatic cells, and (5) about 6 germinative cells. The approximate number of cells is 24 (26 nuclei, including 2 syncytial structures). The results of this study, when compared with other published reports from other cestode taxa, support previous hypotheses that the progr...
