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Matthias Glaubrecht - One of the best experts on this subject based on the ideXlab platform.
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biological diversity or nomenclatural multiplicity the thai freshwater snail neoradina prasongi brandt 1974 gastropoda Thiaridae
Systematics and Biodiversity, 2019Co-Authors: Benedikt Wiggering, Duangduen Krailas, Marco T Neiber, Matthias GlaubrechtAbstract:A key aspect of evolutionary systematics research is the distinction between nomenclatural multiplicity and biological diversity. Unravelling the latter is only possible by identifying true biologi...
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ultrastructure of spermatophoral sperm in the freshwater gastropod thiara amarula linnaeus 1758 cerithioidea Thiaridae potential taxonomic features including eusperm nuclear content differentiation
Journal of Molluscan Studies, 2018Co-Authors: John M Healy, Matthias GlaubrechtAbstract:The ultrastructure of spermatophoral sperm is investigated for the first time in a cerithioidean gastropod. Thiara amarula (Linnaeus, 1758), a widespread Indo-West Pacific species of the Thiaridae, produces uniaxonemal euspermatozoa and multiaxonemal paraspermatozoa. Euspermatozoa possess a laterally-flattened acrosomal vesicle (with eccentrically positioned invagination and subacrosomal material), a tubular, laterally-compressed nucleus, an elongate midpiece (with four, straight, equal-sized mitochondria each with parallel cristae), an elongate glycogen piece and an end piece. The eusperm nucleus exhibits or is associated with a number of unusual features including: (1) nuclear contents differentiated into two components (fibrous, highly electron-dense material, enclosing a pair of less-dense, finely granular tracts); (2) nuclear invagination with two elongate grooves aligned at 90 degrees to the axonemal central microtubules and parallel with the 1 and 5 axonemal doublets; (3) a periodically-banded rootiet associated with the centriolar complex near the nuclear apex; (4) an electron-dense structure attaching the nucleus to the axoneme at the nucleus-midpiece junction. Feature (1) has been reported elsewhere in Melanoides tuberculata (Thiaridae), but in no other examined gastropods (or other molluscs) and its purpose is unknown. Paraspermatozoa of T. amarula possess an elongate head region (up to 14 axonemes and large, irregular mitochondria enclosed by sheath of spherical, dense vesicles), a short 'glycogen' region and a posterior tuft of glycogen tails. The two sperm types do not form spermatozeugmata and observations suggest that neither type undergoes any noticeable structural change while inside the spermatophore. Sperm features suggest a close relationship between T. amurula and M. tuberculata and more broadly with other 'Group T cerithioidean families exhibiting four equal-sized eusperm mitochondria, including Potamididae, Modulidae, Scaliolidae, Melanopsidae, Semisulcospiridae and Pleuroceridae.
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phylogeny of the gastropod superfamily cerithioidea using morphology and molecules
Zoological Journal of the Linnean Society, 2011Co-Authors: Ellen E Strong, John M Healy, D J Colgan, Charles Lydeard, Winston F Ponder, Matthias GlaubrechtAbstract:The Cerithioidea is an ecologically important superfamily of basal Caenogastropoda with speciose marine, brackish water, and freshwater lineages primarily in tropical, subtropical, and warm temperate regions of the world. They often represent significant components of the communities where they occur and have given rise to several spectacular endemic radiations in rivers and ancient lakes. Earlier attempts to resolve the phylogenetic history of the group have been based on smaller taxon and character subsets with incongruent results. Here the monophyly and phylogeny of the group is evaluated with expanded morphological and molecular (16S, 28S rRNA) data sets. For morphological analyses, 151 characters (shell, operculum, radula, alimentary tract, kidney, nervous system, reproductive anatomy, and sperm ultrastructure) were scored for 47 cerithioideans (representing 17 families) and nine outgroup taxa. To test monophyly of the Cerithioidea, extended molecular data sets of 16S and 28S sequences for 57 and 44 taxa, respectively, were compiled using new and previously published sources. For combined analyses, a pruned molecular data set was combined with the morphological partition. The morphological data were analysed alone using only parsimony; molecular and simultaneous analyses were performed using both parsimony and Bayesian inference. The effect of excluding unconserved regions of the alignments was also explored. All analyses, with the exception of the individual 16S and 28S data sets, support monophyly of the Cerithioidea as currently formulated. Of the 12 families represented by more than one terminal, only two (Planaxidae, Potamididae) are always supported as monophyletic; Batillariidae, Cerithiidae, Pachychilidae, Pleuroceridae, Semisulcospiridae, Thiaridae, and Turritellidae are monophyletic in most but not all topologies. The combination of diverse data sources (morphology, 16S and 28S sequences) and inclusion of unconserved regions of the alignments improved the recovery of monophyletic families. At deeper levels, a consensus is beginning to emerge in the recognition of three main assemblages, but whether these represent clades or grades is still unclear; the resolution of these assemblages and the branching order within them are sensitive to exclusion of unconserved regions and choice of optimality criterion. No clear conclusion is reached with respect to the number of freshwater invasions, with two invasions supported on some topologies and three supported on others. Progress toward a robust and stable resolution of cerithioidean relationships will require (1) strategically coordinated sampling for additional morphological and molecular data; (2) comprehensive anatomical treatments for several poorly documented limnic lineages (e.g. Melanopsidae, Thiaridae) and comparative data for poorly understood organ systems (e.g. renal system); (3) the addition of poorly known, minute, and/or rare marine taxa, to provide novel character combinations, insight into putative homologies, and to help anchor basal nodes and break up long branches. © 2011 The Linnean Society of London, Zoological Journal of the Linnean Society, 2011, 162, 43–89.
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diversity and disparity down under systematics biogeography and reproductive modes of the marsupial freshwater Thiaridae caenogastropoda cerithioidea in australia
Zoosystematics and Evolution, 2009Co-Authors: Matthias Glaubrecht, Nora Brinkmann, Judith PoppeAbstract:We systematically revise here the Australian taxa of the Thiaridae, a group of freshwater Cerithioidea with pantropical distribution and “marsupial” (i.e. viviparous) reproductive modes. On this long isolated continent, the naming of several monotypic genera and a plethora of species have clouded both the phylogenetical and biogeographical relationships with other thiarids, in particular in Southeast Asia, thus hampering insight into the evolution of Australian taxa and their natural history. Based on own collections during five expeditions to various regions in Australia between 2002 and 2007, the study of relevant type material and the comparison with (mostly shell) material from major Australian museum collections, we describe and document here the morphology (of adults and juveniles) and radulae of all relevant thiarid taxa, discussing the taxonomical implications and nomenclatural consequences. Presenting comprehensive compilations of the occurrences for all Australian thiarid species, we document their geographical distribution (based on over 900 records) with references ranging from continent-wide to drainage-based patterns. We morphologically identify a total of eleven distinct species (also corroborated as distinct clades by molecular genetic data, to be reported elsewhere), of which six species are endemic to Australia, viz. “Thiara australis ”, Plotiopsis balonnensis, and “Stenomelania ” denisoniensis with wide distribution and Melasma onca, Sermyla venustula, and Ripalania queenslandica with more restricted ranges. In contrast, Thiara amarula and Stenomelania cf. aspirans as well as Melanoides tuberculata, Plotia scabra, and Sermyla riqueti are widely distributed also outside Australia, in particular in the Malay Archipelago and the Indo-West Pacific, respectively. The occurrences especially of the latter three species are discussed, concluding on quite distinct historical contingencies. Three thiarids species, viz. Stenomelania cf. aspirans, Sermyla riqueti and Plotia scabra, are recorded here for the first time for Australia. Based on a new taxonomic framework for the Thiaridae we point out some of the pertinent problems with naming and artificial delineation of species, revealing why typology and earlier practice of splitting was misleading in case of these truly “Darwinian snails”. We also report on finding two clearly distinct viviparous modes in Australian thiarids, discussing their distribution in certain fluvifaunal provinces and major drainage systems in concert with these reproductive features of life history tactics. While the live-bearing T. amarula, S. cf. aspirans, and R. queenslandica, that release veligers (ovo-viviparity), are found to have very restricted occurrences in rivers and streams in the Jardinian province of NE Queensland only, the five more widely distributed Australian endemics Plotiopsis balonnensis and “Stenomelania ” denisoniensis as well as “Thiara australis ”, Sermyla venustula and Melasma onca in the Leichhardtian province all brood and release shelled juveniles (eu-viviparity). Finally, we hypothesize on the evolutionary history and colonization of Australia by different lineages of these freshwater Cerithioidea. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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adaptive radiation of thalassoid gastropods in lake tanganyika east africa morphology and systematization of a paludomid species flock in an ancient lake
Zoosystematics and Evolution, 2008Co-Authors: Matthias GlaubrechtAbstract:The paludomid gastropods of Lake Tanganyika are one of the most spectacular examples of species flocks among molluscs. However, whether they provide an example of intralacustrine speciation and truly adaptive radiation still remains unresolved, with their monophyly and phylogenetic relationships within freshwater Cerithioidea still to be rigorously evaluated. In the course of providing the data for a future comprehensive phylogenetic analysis, this paper using SEM technique describes and documents the morphology of the adult and particularly the embryonic shell (ornamentation and size) as well as the radular anatomy (including cusp pattern), with remarks on the ontogeny and ecology, for 19 species belonging to 10 genera, mainly from a collection from Kigoma Bay, East shore of Lake Tanganyika, Tanzania. The species studied live either on soft sandy and silty bottoms or on primary or secondary hard substrata, representing two ecological guilds, with rocky substrata supporting a richer species assemblage (including five taxa of Lavigeria) than soft substrata. In addition, a systematic framework for these gastropods is suggested, with protoconch and radular morphology found to be most useful to characterize and differentiate genera and species, while teleoconch and opercular features correspond to three distinct lineages corroborated also by molecular data, viz. the Paramelaniinae with paludomid-like concentric operculum with spiral nucleus, the viviparous Nassopsinae Kesteven, 1903 (= Lavigeriinae Thiele, 1925) with subspiral to paucispiral operculum, and the minute sand-dwelling Syrnolopsinae with paucispiral operculum. Oviparity was found in 70% of the 32 thalassoid species from 17 genera and represents the most common and presumably ancestral reproductive mode within Tanganyikan gastropods, while two different viviparous strategies can be differentiated in 20% of the species (in four other species the reproductive mode is unknown). Finally, some standard hypotheses as to the question of relationships with Thiaridae, monophyly, in situ radiation and viviparity as a key innovation for this radiation are briefly reviewed and discussed. It is concluded that all studied species of the thalassoid species flock are actually members of the Paludomidae instead of the true Thiaridae, representing an evolutionary lineage of ancient, and most likely originally riverine Cerithioidea that predated the formation of the East African Rift system. Consequently, neither the broad spectrum of phenotypes nor the unique morphological features should be viewed as adaptations during the course of exclusively intralacustrine speciation and adaptive radiation within Lake Tanganyika. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
John M Healy - One of the best experts on this subject based on the ideXlab platform.
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ultrastructure of spermatophoral sperm in the freshwater gastropod thiara amarula linnaeus 1758 cerithioidea Thiaridae potential taxonomic features including eusperm nuclear content differentiation
Journal of Molluscan Studies, 2018Co-Authors: John M Healy, Matthias GlaubrechtAbstract:The ultrastructure of spermatophoral sperm is investigated for the first time in a cerithioidean gastropod. Thiara amarula (Linnaeus, 1758), a widespread Indo-West Pacific species of the Thiaridae, produces uniaxonemal euspermatozoa and multiaxonemal paraspermatozoa. Euspermatozoa possess a laterally-flattened acrosomal vesicle (with eccentrically positioned invagination and subacrosomal material), a tubular, laterally-compressed nucleus, an elongate midpiece (with four, straight, equal-sized mitochondria each with parallel cristae), an elongate glycogen piece and an end piece. The eusperm nucleus exhibits or is associated with a number of unusual features including: (1) nuclear contents differentiated into two components (fibrous, highly electron-dense material, enclosing a pair of less-dense, finely granular tracts); (2) nuclear invagination with two elongate grooves aligned at 90 degrees to the axonemal central microtubules and parallel with the 1 and 5 axonemal doublets; (3) a periodically-banded rootiet associated with the centriolar complex near the nuclear apex; (4) an electron-dense structure attaching the nucleus to the axoneme at the nucleus-midpiece junction. Feature (1) has been reported elsewhere in Melanoides tuberculata (Thiaridae), but in no other examined gastropods (or other molluscs) and its purpose is unknown. Paraspermatozoa of T. amarula possess an elongate head region (up to 14 axonemes and large, irregular mitochondria enclosed by sheath of spherical, dense vesicles), a short 'glycogen' region and a posterior tuft of glycogen tails. The two sperm types do not form spermatozeugmata and observations suggest that neither type undergoes any noticeable structural change while inside the spermatophore. Sperm features suggest a close relationship between T. amurula and M. tuberculata and more broadly with other 'Group T cerithioidean families exhibiting four equal-sized eusperm mitochondria, including Potamididae, Modulidae, Scaliolidae, Melanopsidae, Semisulcospiridae and Pleuroceridae.
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phylogeny of the gastropod superfamily cerithioidea using morphology and molecules
Zoological Journal of the Linnean Society, 2011Co-Authors: Ellen E Strong, John M Healy, D J Colgan, Charles Lydeard, Winston F Ponder, Matthias GlaubrechtAbstract:The Cerithioidea is an ecologically important superfamily of basal Caenogastropoda with speciose marine, brackish water, and freshwater lineages primarily in tropical, subtropical, and warm temperate regions of the world. They often represent significant components of the communities where they occur and have given rise to several spectacular endemic radiations in rivers and ancient lakes. Earlier attempts to resolve the phylogenetic history of the group have been based on smaller taxon and character subsets with incongruent results. Here the monophyly and phylogeny of the group is evaluated with expanded morphological and molecular (16S, 28S rRNA) data sets. For morphological analyses, 151 characters (shell, operculum, radula, alimentary tract, kidney, nervous system, reproductive anatomy, and sperm ultrastructure) were scored for 47 cerithioideans (representing 17 families) and nine outgroup taxa. To test monophyly of the Cerithioidea, extended molecular data sets of 16S and 28S sequences for 57 and 44 taxa, respectively, were compiled using new and previously published sources. For combined analyses, a pruned molecular data set was combined with the morphological partition. The morphological data were analysed alone using only parsimony; molecular and simultaneous analyses were performed using both parsimony and Bayesian inference. The effect of excluding unconserved regions of the alignments was also explored. All analyses, with the exception of the individual 16S and 28S data sets, support monophyly of the Cerithioidea as currently formulated. Of the 12 families represented by more than one terminal, only two (Planaxidae, Potamididae) are always supported as monophyletic; Batillariidae, Cerithiidae, Pachychilidae, Pleuroceridae, Semisulcospiridae, Thiaridae, and Turritellidae are monophyletic in most but not all topologies. The combination of diverse data sources (morphology, 16S and 28S sequences) and inclusion of unconserved regions of the alignments improved the recovery of monophyletic families. At deeper levels, a consensus is beginning to emerge in the recognition of three main assemblages, but whether these represent clades or grades is still unclear; the resolution of these assemblages and the branching order within them are sensitive to exclusion of unconserved regions and choice of optimality criterion. No clear conclusion is reached with respect to the number of freshwater invasions, with two invasions supported on some topologies and three supported on others. Progress toward a robust and stable resolution of cerithioidean relationships will require (1) strategically coordinated sampling for additional morphological and molecular data; (2) comprehensive anatomical treatments for several poorly documented limnic lineages (e.g. Melanopsidae, Thiaridae) and comparative data for poorly understood organ systems (e.g. renal system); (3) the addition of poorly known, minute, and/or rare marine taxa, to provide novel character combinations, insight into putative homologies, and to help anchor basal nodes and break up long branches. © 2011 The Linnean Society of London, Zoological Journal of the Linnean Society, 2011, 162, 43–89.
Margarita Ostrowski De Nunez - One of the best experts on this subject based on the ideXlab platform.
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the life cycle of neocladocystis intestinalis vaz 1932 digenea cryptogonimidae in aylacostoma chloroticum prosobranchia Thiaridae and salminus brasiliensis characiformes characidae in argentina
Parasitology Research, 2016Co-Authors: Manuel G Quintana, Margarita Ostrowski De NunezAbstract:The life cycle of Neocladocystis intestinalis (Vaz, 1932) was resolved experimentally. The prosobranchiate snail Aylacostoma chloroticum Hylton Scott (Thiaridae) collected in the Yacyreta Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that possessed pigmented eye spots, 7 pairs of penetration glands, 12 pairs of flame cells, and a V-shaped, or Y-shaped excretory vesicle with very short stem. The cercariae developed in oval cysts, which were found on fin rays, and under scales of naturally and experimentally exposed tetragonopterid fish species and of experimentally exposed poecilid and prochilodont fish species. Adults were obtained experimentally from juvenile Salminus brasiliensis (Characidae), bred in captivity, and infected with metacercariae from albino Gymnocorymbus ternetzi (Tetragonopteridae), which had been exposed to emerging cercariae.
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the life cycle of pseudosellacotyla lutzi digenea cryptogonimidae in aylacostoma chloroticum prosobranchia Thiaridae and hoplias malabaricus characiformes erythrinidae in argentina
Journal of Parasitology, 2014Co-Authors: Manuel G Quintana, Margarita Ostrowski De NunezAbstract:Abstract: Pseudosellacotyla lutzi (Freitas, 1941), at present included in the Faustulidae, is redescribed, and its life cycle was resolved experimentally. The prosobranch snail Aylacostoma chloroticum Hylton Scott (Thiaridae), collected in the Yacyreta Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that lacked pigmented eyespots, and possessed 7 pairs of penetration glands, 8 pairs of flame cells, and a V-shaped excretory vesicle. The cercariae developed in oval cysts, which were found on fin rays, vertebrae, and spines of poeciliid and tetragonopterid fish species. Adults were obtained experimentally from Hoplias malabaricus (Erythrinidae) infected with metacercariae from albino Gymnocorymbus ternetzi (Tetragonopteridae), which had been exposed to emerging cercariae. Adults were also found in naturally infected H. malabaricus collected in the Yacyreta Dam. The morphology of the cercariae, and the characteristics of the life cycle show that P. lutzi should be included i...
Marcelo Fulgêncio Guedes De ,brito - One of the best experts on this subject based on the ideXlab platform.
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Comércio de aquarismo como potencial dispersor de invertebrados não-nativos no Nordeste do Brasil
Universidade do Vale do Rio dos Sinos (Unisinos), 2014Co-Authors: Daniel Alvares Silveira De ,assis, Cavalcante, Sidney Sales, Marcelo Fulgêncio Guedes De ,britoAbstract:O comércio de peixes ornamentais figura entre os principais mecanismos de invasões biológicas. Muita atenção é dada às espécies-alvo introduzidas, porém, pouco se discute sobre a fauna acompanhante das introduções. O objetivo do presente estudo foi analisar o risco de invasão de invertebrados não-comerciais utilizando lojas de aquário como modelo. Visitas mensais a oito lojas na cidade de Aracaju ocorreram de abril a setembro de 2011. Nos estabelecimentos, foram realizadas inspeções e aplicações de questioná- rios aos lojistas. Foram detectadas duas espécies não-nativas, Melanoides tuberculatus (Gastropoda: Thiaridae) e Lernaea cyprinacea (Crustacea, Copepoda). Sessenta e dois espécimes de M. tuberculatus foram coletados em meio às plantas em uma das lojas, enquanto L. cyprinacea foi registrada em quatro estabelecimentos parasitando Carassius auratus, Hypostomus sp., Poecilia latipinna, Poecilia sphenops, Poecilia reticulata e Xiphophorus hellerii. As entrevistas revelaram que nenhuma das lojas submete peixes e plantas adquiridos à quarentena, sendo o descarte da água dos aquários feito diretamente na rede de esgoto. São sugeridas medidas preventivas, tais como período de quarentena para peixes e orientação sobre os perigos das invasões biológicas ou soltura de espécimes no ambiente natural, visando à mitigação dos riscos de invasão.Aquarium trade is one of the most important pathways of biological invasion. Much attention has been given to target introduced species, but little is discussed on the associated bycatch ones. The aim of this paper is to analyze the risk of invasion by non-commercial invertebrates using aquarium stores as a model. Monthly visits to eight stores in Aracaju (Sergipe State) were performed from April to September 2011. Inspections were carried out and questionnaires were applied to owners and employees of the establishments. Two non-native species were identified, Melanoides tuberculatus (Gastropoda: Thiaridae) and Lernaea cyprinacea (Crustacea, Copepoda). Sixty-two specimens of M. tuberculatus were found among the aquatic plants in one of the stores, while L. cyprinacea was collected in four establishments parasitizing Carassius auratus, Hypostomus sp., Poecilia latipinna, Poecilia sphenops, Poecilia reticulata and Xiphophorus hellerii. The interviews that have been done with owners and employees revealed that none of the stores has submitted fishes and plants to quarantine, and the disposal of wastewater is directly into the sewer system. It is necessary to adopt preventive measures such as a quarantine period for fishes and the creation of a warning about the dangers of biological invasions or aquarium dumping for aquarium hobbyists to mitigate the risk of invasion
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Comércio de aquarismo como potencial dispersor de invertebrados não-nativos no Nordeste do Brasil
'UNISINOS - Universidade do Vale do Rio Dos Sinos', 2014Co-Authors: Daniel Alvares Silveira De ,assis, Cavalcante, Sidney Sales, Marcelo Fulgêncio Guedes De ,britoAbstract:Aquarium trade is one of the most important pathways of biological invasion. Much attention has been given to target introduced species, but little is discussed on the associated bycatch ones. The aim of this paper is to analyze the risk of invasion by non-commercial invertebrates using aquarium stores as a model. Monthly visits to eight stores in Aracaju (Sergipe State) were performed from April to September 2011. Inspections were carried out and questionnaires were applied to owners and employees of the establishments. Two non-native species were identified, Melanoides tuberculatus (Gastropoda: Thiaridae) and Lernaea cyprinacea (Crustacea, Copepoda). Sixty-two specimens of M. tuberculatus were found among the aquatic plants in one of the stores, while L. cyprinacea was collected in four establishments parasitizing Carassius auratus, Hypostomus sp., Poecilia latipinna, Poecilia sphenops, Poecilia reticulata and Xiphophorus hellerii. The interviews that have been done with owners and employees revealed that none of the stores has submitted fishes and plants to quarantine, and the disposal of wastewater is directly into the sewer system. It is necessary to adopt preventive measures such as a quarantine period for fishes and the creation of a warning about the dangers of biological invasions or aquarium dumping for aquarium hobbyists to mitigate the risk of invasion.Keywords: bioinvasion, Lernaea cyprinacea, Melanoides tuberculatus.O comércio de peixes ornamentais figura entre os principais mecanismos de invasões biológicas. Muita atenção é dada às espécies-alvo introduzidas, porém, pouco se discute sobre a fauna acompanhante das introduções. O objetivo do presente estudo foi analisar o risco de invasão de invertebrados não-comerciais utilizando lojas de aquário como modelo. Visitas mensais a oito lojas na cidade de Aracaju ocorreram de abril a setembro de 2011. Nos estabelecimentos, foram realizadas inspeções e aplicações de questionários aos lojistas. Foram detectadas duas espécies não-nativas, Melanoides tuberculatus (Gastropoda: Thiaridae) e Lernaea cyprinacea (Crustacea, Copepoda). Sessenta e dois espécimes de M. tuberculatus foram coletados em meio às plantas em uma das lojas, enquanto L. cyprinacea foi registrada em quatro estabelecimentos parasitando Carassius auratus, Hypostomus sp., Poecilia latipinna, Poecilia sphenops, Poecilia reticulata e Xiphophorus hellerii. As entrevistas revelaram que nenhuma das lojas submete peixes e plantas adquiridos à quarentena, sendo o descarte da água dos aquários feito diretamente na rede de esgoto. São sugeridas medidas preventivas, tais como período de quarentena para peixes e orientação sobre os perigos das invasões biológicas ou soltura de espécimes no ambiente natural, visando à mitigação dos riscos de invasão.Palavras-chave: bioinvasão, Lernaea cyprinacea, Melanoides tuberculatus
Manuel G Quintana - One of the best experts on this subject based on the ideXlab platform.
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the life cycle of neocladocystis intestinalis vaz 1932 digenea cryptogonimidae in aylacostoma chloroticum prosobranchia Thiaridae and salminus brasiliensis characiformes characidae in argentina
Parasitology Research, 2016Co-Authors: Manuel G Quintana, Margarita Ostrowski De NunezAbstract:The life cycle of Neocladocystis intestinalis (Vaz, 1932) was resolved experimentally. The prosobranchiate snail Aylacostoma chloroticum Hylton Scott (Thiaridae) collected in the Yacyreta Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that possessed pigmented eye spots, 7 pairs of penetration glands, 12 pairs of flame cells, and a V-shaped, or Y-shaped excretory vesicle with very short stem. The cercariae developed in oval cysts, which were found on fin rays, and under scales of naturally and experimentally exposed tetragonopterid fish species and of experimentally exposed poecilid and prochilodont fish species. Adults were obtained experimentally from juvenile Salminus brasiliensis (Characidae), bred in captivity, and infected with metacercariae from albino Gymnocorymbus ternetzi (Tetragonopteridae), which had been exposed to emerging cercariae.
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the life cycle of pseudosellacotyla lutzi digenea cryptogonimidae in aylacostoma chloroticum prosobranchia Thiaridae and hoplias malabaricus characiformes erythrinidae in argentina
Journal of Parasitology, 2014Co-Authors: Manuel G Quintana, Margarita Ostrowski De NunezAbstract:Abstract: Pseudosellacotyla lutzi (Freitas, 1941), at present included in the Faustulidae, is redescribed, and its life cycle was resolved experimentally. The prosobranch snail Aylacostoma chloroticum Hylton Scott (Thiaridae), collected in the Yacyreta Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that lacked pigmented eyespots, and possessed 7 pairs of penetration glands, 8 pairs of flame cells, and a V-shaped excretory vesicle. The cercariae developed in oval cysts, which were found on fin rays, vertebrae, and spines of poeciliid and tetragonopterid fish species. Adults were obtained experimentally from Hoplias malabaricus (Erythrinidae) infected with metacercariae from albino Gymnocorymbus ternetzi (Tetragonopteridae), which had been exposed to emerging cercariae. Adults were also found in naturally infected H. malabaricus collected in the Yacyreta Dam. The morphology of the cercariae, and the characteristics of the life cycle show that P. lutzi should be included i...