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David Bruce Conn - One of the best experts on this subject based on the ideXlab platform.
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(Cyclophyllidea, Anoplocephalidae)
2015Co-Authors: David Bruce Conn, Jordi Miquel, Catarina Eira, Anna Baranowska-korczycAbstract:The ultrastructure of oncospheral hook formation in the anoplocephalid cestode Mosgovoyia ctenoides (Railliet, 1890) Beveridge, 1978, is described. The hook morphogenesis takes place inside the six symmetrically arranged hook-forming cells, the oncoblasts. They show characteristic large nuclei of semilunar shape, localized at one pole of the embryo. At the begin-ning of the hook formation, the hook-forming centre appears in the cytoplasmic part of each oncoblast. It consists of numer-ous free ribosomes and polyribosomes surrounded by several mitochondria and Golgi complexes. The hook-forming centre is involved in synthesis of an electron-dense, undifferentiated hook primordium, which undergoes progressive differentiation and elongation into the fully developed hook. A fully formed oncospheral hook consists of the three parts: blade, shank, and base. Each hook, at the site of its protrusion from the oncosphere, is surrounded by two electron-dense rings interconnected by a circular septate junction. The hook material consists of two or three layers that differ in electron density: (1) a moderate-ly electron-dense core, (2) a middle layer of low electron density, and (3) a highly osmiophilic cortex. Wide bands of hook muscles are attached to the basal and collar parts of the hook. The hook blades project outside of the oncospheral body into a large cavity delimited by the hook region membrane attached at this pole directly to the oncospheral surface. In the fully devel-oped oncosphere of M. ctenoides, the three pairs of oncospheral hooks and their muscles form a complex hook muscle system
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CASE REPORT: HUMAN BRAIN ABSCESS DUE TO A TETRA-ACETABULATE PLEROCERCOID METACESTODE (Cyclophyllidea)
2015Co-Authors: Yves J. F. Garin, Antoine Moulignier, Gilles Robert, F. Heran, Marc Polivka, Peter D. Olson, Frédéric Lorenzo, Francis Derouin, Maria-teresa Galán-puchades, David Bruce ConnAbstract:Abstract. A 38-year-old man living near Phnom Penh (Cambodia) was admitted to a hospital in Paris in June 2001 for a single episode of a generalized grand mal seizure. This episode was preceded by a 9-month history of headaches. Magnetic resonance imaging (MRI) of the head revealed a rounded lesion immediately ahead of the left central sulcus. The resected lesion was about 20 mm in diameter. Histologic examination revealed an elongated but unsegmented metacestode at the center of the lesion. Polymerase chain reaction (PCR) analysis was inconclusive due to formalin-based histologic processing of the tissue. Morphologic analysis based on the histologic sections revealed that the metacestode was a tetra-acetabulate plerocercoid of the order Cyclophyllidea, with a distinct rostellum and pseudoseg-mentation of the dorsoventrally flattened hindbody. This is the first report of a tetra-acetabulate plerocercoid from a human host and the first report of any Cyclophyllidean plerocercoid from the human brain. After 6 weeks, the patient was asymptomatic, neurologic examination was normal, and the brain MRI showed only surgical cavitation. The patient returned to Cambodia
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HUMAN BRAIN ABSCESS DUE TO A TETRA-ACETABULATE PLEROCERCOID METACESTODE (Cyclophyllidea)
The American journal of tropical medicine and hygiene, 2005Co-Authors: Yves J. F. Garin, M. T. Galan-puchades, Antoine Moulignier, Gilles Robert, F. Heran, Marc Polivka, Peter D. Olson, Frédéric Lorenzo, Francis Derouin, David Bruce ConnAbstract:A 38-year-old man living near Phnom Penh (Cambodia) was admitted to a hospital in Paris in June 2001 for a single episode of a generalized grand mal seizure. This episode was preceded by a 9-month history of headaches. Magnetic resonance imaging (MRI) of the head revealed a rounded lesion immediately ahead of the left central sulcus. The resected lesion was about 20 mm in diameter. Histologic examination revealed an elongated but unsegmented metacestode at the center of the lesion. Polymerase chain reaction (PCR) analysis was inconclusive due to formalin-based histologic processing of the tissue. Morphologic analysis based on the histologic sections revealed that the metacestode was a tetra-acetabulate plerocercoid of the order Cyclophyllidea, with a distinct rostellum and pseudosegmentation of the dorsoventrally flattened hindbody. This is the first report of a tetra-acetabulate plerocercoid from a human host and the first report of any Cyclophyllidean plerocercoid from the human brain. After 6 weeks, the patient was asymptomatic, neurologic examination was normal, and the brain MRI showed only surgical cavitation. The patient returned to Cambodia.
Boyko B. Georgiev - One of the best experts on this subject based on the ideXlab platform.
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massive infection of a song thrush by mesocestoides sp cestoda tetrathyridia that genetically match acephalic metacestodes causing lethal peritoneal larval cestodiasis in domesticated mammals
Parasites & Vectors, 2019Co-Authors: Petr Heneberg, Jiljí Sitko, Boyko B. Georgiev, Ivan LiterakAbstract:Background Peritoneal larval cestodiasis induced by Mesocestoides Vaillant, 1863 (Cyclophyllidea: Mesocestoididae) is a common cause of severe infections in domestic dogs and cats, reported also from other mammals and less frequently from birds. However, there is a limited knowledge on the taxonomy of causative agents of this disease.
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Bird cestodes from Huinay (Comau Fjord), Chilean Patagonia: several species of the family Dilepididae (Platyhelminthes, Cyclophyllidea), with the erection of two new genera.
ZooKeys, 2018Co-Authors: Jean Mariaux, Boyko B. GeorgievAbstract:Birds in the Huinay area, Los Lagos region, Chile, were studied for parasites. Here we report 2 new genera and species of the family Dilepididae (Cyclophyllidea) found in common local passerines: Janinelliapeebeehigen. n., sp. n. was found in Elaeniaalbiceps (Tyrannidae) and Huinaylepiselegansgen. n., sp. n. was found in Aphrasturaspinicauda (Furnariidae). Other dilepidid parasites are reported for the first time from Xolmispyrope (Tyrannidae) and from 2 species of Rhinocryptidae. Cotylorhipissureshi Jadhav & Shinde, 1981 is considered a species inquirenda. The very high diversity and endemism of the observed cestode fauna in the Valdivian temperate rain forests is noted.
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the first data on the vitellogenesis of paruterinid tapeworms an ultrastructural study of dictyterina cholodkowskii cestoda Cyclophyllidea
Parasitology Research, 2017Co-Authors: Aneta Yoneva, Jean Mariaux, Roman Kuchta, Boyko B. GeorgievAbstract:The present study provides the first ultrastructural data of the vitellogenesis in a cestode species of the Cyclophyllidean family Paruterinidae, aiming to expand the limited data on the vitellogenesis in Cyclophyllidean cestodes and to explore the potential of ultrastructural characters associated with vitellogenesis for phylogenetic and taxonomic studies of this order. The process of vitellocyte formation in Dictyterina cholodkowskii follows the general pattern observed in other tapeworms but exhibits several specific differences in the ultrastructure of vitelline cells. The vitellarium contains vitellocytes at various stages of maturation. The periphery of the vitellarium and the space between maturing vitellocytes are occupied by interstitial cells. Differentiation into mature vitellocytes is characterized by high secretory activity, which involves the development of granular endoplasmic reticulum, Golgi complexes, mitochondria and vitelline globules of various sizes. During vitellogenesis, the progressive fusion of these globules results in the formation of two large membrane-limited vitelline vesicles that eventually fuse into a single large vesicle. Mature vitellocytes are composed of a single vitelline vesicle, a high content of cytoplasmic organelles and have no nucleus. No traces of lipid droplets and glycogen granules are detected in the cytoplasm of mature vitellocytes, which might be related to biological peculiarities of this family, i.e. the release of eggs into environment within the tissues of the paruterine organ, which may serve as a source of nutrients for embryos.
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Description of Diorchis thracica n. sp. (Cestoda, Hymenolepididae) from the ruddy shelduck Tadorna ferruginea (Pallas) (Anseriformes, Anatidae) in Bulgaria.
Systematic Parasitology, 2015Co-Authors: Margarita H. Marinova, Boyko B. Georgiev, Gergana P. VasilevaAbstract:Diorchis thracica n. sp. (Cestoda, Cyclophyllidea, Hymenolepididae) is described from the ruddy shelduck Tadorna ferruginea (Pallas) (Aves, Anseriformes, Anatidae), collected in the vicinities of Radnevo, Stara Zagora Region, Bulgaria. The new species is differentiated from other members of Diorchis Clerc, 1903 by possessing rostellar hooks with length of 36 µm, a thick-walled cirrus-sac with strong longitudinal muscular fibres in its middle part and a copulatory vagina with two sphincters. Main morphological criteria for distinguishing species of the genus Diorchis are discussed.
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Wardium Ponticum Sp. N. (Cestoda, Cyclophyllidea, Hymenolepidoidea), a Parasite of Pratincole (Glareola Pratincola) from the Black Sea Coast
Vestnik Zoologii, 2012Co-Authors: V. V. Kornyushin, Boyko B. Georgiev, O. B. GrebenAbstract:Wardium PonticumSp. N. (Cestoda, Cyclophyllidea, Hymenolepidoidea), a Parasite of Pratincole (Glareola Pratincola) from the Black Sea CoastThe new speciesWardium ponticumKornyushin, Georgiev et Greben, sp. n. (Aploparksidae Mayhew, 1925) parasitic in pratincole (Glareola pratincolaLinnaeus, 1766) from Bulgaria and Ukraine is described. The species is characterized by 10 aploparaksoid hooks, 9-10 mm long, and clearly differs from all congeneric species by the shape and armament of the cirrus.
Yves J. F. Garin - One of the best experts on this subject based on the ideXlab platform.
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CASE REPORT: HUMAN BRAIN ABSCESS DUE TO A TETRA-ACETABULATE PLEROCERCOID METACESTODE (Cyclophyllidea)
2015Co-Authors: Yves J. F. Garin, Antoine Moulignier, Gilles Robert, F. Heran, Marc Polivka, Peter D. Olson, Frédéric Lorenzo, Francis Derouin, Maria-teresa Galán-puchades, David Bruce ConnAbstract:Abstract. A 38-year-old man living near Phnom Penh (Cambodia) was admitted to a hospital in Paris in June 2001 for a single episode of a generalized grand mal seizure. This episode was preceded by a 9-month history of headaches. Magnetic resonance imaging (MRI) of the head revealed a rounded lesion immediately ahead of the left central sulcus. The resected lesion was about 20 mm in diameter. Histologic examination revealed an elongated but unsegmented metacestode at the center of the lesion. Polymerase chain reaction (PCR) analysis was inconclusive due to formalin-based histologic processing of the tissue. Morphologic analysis based on the histologic sections revealed that the metacestode was a tetra-acetabulate plerocercoid of the order Cyclophyllidea, with a distinct rostellum and pseudoseg-mentation of the dorsoventrally flattened hindbody. This is the first report of a tetra-acetabulate plerocercoid from a human host and the first report of any Cyclophyllidean plerocercoid from the human brain. After 6 weeks, the patient was asymptomatic, neurologic examination was normal, and the brain MRI showed only surgical cavitation. The patient returned to Cambodia
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HUMAN BRAIN ABSCESS DUE TO A TETRA-ACETABULATE PLEROCERCOID METACESTODE (Cyclophyllidea)
The American journal of tropical medicine and hygiene, 2005Co-Authors: Yves J. F. Garin, M. T. Galan-puchades, Antoine Moulignier, Gilles Robert, F. Heran, Marc Polivka, Peter D. Olson, Frédéric Lorenzo, Francis Derouin, David Bruce ConnAbstract:A 38-year-old man living near Phnom Penh (Cambodia) was admitted to a hospital in Paris in June 2001 for a single episode of a generalized grand mal seizure. This episode was preceded by a 9-month history of headaches. Magnetic resonance imaging (MRI) of the head revealed a rounded lesion immediately ahead of the left central sulcus. The resected lesion was about 20 mm in diameter. Histologic examination revealed an elongated but unsegmented metacestode at the center of the lesion. Polymerase chain reaction (PCR) analysis was inconclusive due to formalin-based histologic processing of the tissue. Morphologic analysis based on the histologic sections revealed that the metacestode was a tetra-acetabulate plerocercoid of the order Cyclophyllidea, with a distinct rostellum and pseudosegmentation of the dorsoventrally flattened hindbody. This is the first report of a tetra-acetabulate plerocercoid from a human host and the first report of any Cyclophyllidean plerocercoid from the human brain. After 6 weeks, the patient was asymptomatic, neurologic examination was normal, and the brain MRI showed only surgical cavitation. The patient returned to Cambodia.
Jean Mariaux - One of the best experts on this subject based on the ideXlab platform.
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Bird cestodes from Huinay (Comau Fjord), Chilean Patagonia: several species of the family Dilepididae (Platyhelminthes, Cyclophyllidea), with the erection of two new genera.
ZooKeys, 2018Co-Authors: Jean Mariaux, Boyko B. GeorgievAbstract:Birds in the Huinay area, Los Lagos region, Chile, were studied for parasites. Here we report 2 new genera and species of the family Dilepididae (Cyclophyllidea) found in common local passerines: Janinelliapeebeehigen. n., sp. n. was found in Elaeniaalbiceps (Tyrannidae) and Huinaylepiselegansgen. n., sp. n. was found in Aphrasturaspinicauda (Furnariidae). Other dilepidid parasites are reported for the first time from Xolmispyrope (Tyrannidae) and from 2 species of Rhinocryptidae. Cotylorhipissureshi Jadhav & Shinde, 1981 is considered a species inquirenda. The very high diversity and endemism of the observed cestode fauna in the Valdivian temperate rain forests is noted.
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Cyclophyllidea van Beneden in Braun, 1900
2017Co-Authors: Jean Mariaux, Gergana P. Vasileva, Vasyl V. Tkach, Andrea Waeschenbach, I Beveridge, Yana D. Dimitrova, Haukisalmi, Stephen E. Greiman, D. T. J. Littlewood, Arseny A. MakarikovAbstract:This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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the first data on the vitellogenesis of paruterinid tapeworms an ultrastructural study of dictyterina cholodkowskii cestoda Cyclophyllidea
Parasitology Research, 2017Co-Authors: Aneta Yoneva, Jean Mariaux, Roman Kuchta, Boyko B. GeorgievAbstract:The present study provides the first ultrastructural data of the vitellogenesis in a cestode species of the Cyclophyllidean family Paruterinidae, aiming to expand the limited data on the vitellogenesis in Cyclophyllidean cestodes and to explore the potential of ultrastructural characters associated with vitellogenesis for phylogenetic and taxonomic studies of this order. The process of vitellocyte formation in Dictyterina cholodkowskii follows the general pattern observed in other tapeworms but exhibits several specific differences in the ultrastructure of vitelline cells. The vitellarium contains vitellocytes at various stages of maturation. The periphery of the vitellarium and the space between maturing vitellocytes are occupied by interstitial cells. Differentiation into mature vitellocytes is characterized by high secretory activity, which involves the development of granular endoplasmic reticulum, Golgi complexes, mitochondria and vitelline globules of various sizes. During vitellogenesis, the progressive fusion of these globules results in the formation of two large membrane-limited vitelline vesicles that eventually fuse into a single large vesicle. Mature vitellocytes are composed of a single vitelline vesicle, a high content of cytoplasmic organelles and have no nucleus. No traces of lipid droplets and glycogen granules are detected in the cytoplasm of mature vitellocytes, which might be related to biological peculiarities of this family, i.e. the release of eggs into environment within the tissues of the paruterine organ, which may serve as a source of nutrients for embryos.
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a molecular phylogeny of the eucestoda
Journal of Parasitology, 1998Co-Authors: Jean MariauxAbstract:Evolutionary relationships among the orders of the Eucestoda were examined based on data derived from partial sequences of genes encoding 18S rRNA. Considered in this study were 47 species-level taxa, including 1 from Monogenea, 1 from Amphilinidea, both of which were used as outgroups, and 45 from 10 orders of Eucestoda. Parsimony analysis of 1.1 kbp of aligned fragments yielded 480 shortest trees (length 704; consistency index 0.41) the strict consensus of which shows the following relationships: (Monogenea, (Amphilinidea, (Caryophyllidea, (Spathebothriidea, (Trypanorhyncha, (Pseudophyllidea, (Tetraphyllidea, ((Diphyllidea, Proteocephalidea), ((Cyclophyllidea, Tetrabothriidea), Nippotaeniidea))))))))). The Tetraphyllidea, Pseudophyllidea (because of the Diphyllobothriidae), and Cyclophyllidea (because of the Mesocestoididae) were found to be paraphyletic. This tree is almost completely congruent with the most recent hypotheses based on characters derived from com- parative morphology, ontogeny, and ultrastructural studies. The only discrepancies between these separate analyses were in the position of the Trypanorhyncha and Diphyllidea. Among the main conclusions corroborated here are the following: (1) the basal position of the Caryophyllidea (and Spathebothriidea), and hence the plesiomorphic condition of monozoism; (2) the monophyly of the "higher tetrafossates" provided the nippotaeniids and tetrabothriids are included; (3) the close relationship between the Tetrabothriidea and Cyclophyllidea; and (4) the paraphyly of the Tetraphyllidea. At lower taxonomic levels, structure could not be defined within Proteocephalidea; within the Cyclophyllidea, all families represented by several taxa (Hymenolepididae, Da- vaineidae, and Dilepididae) were found to be monophyletic, and Taeniidae may be the most basal family. Furthermore, the validity of the Gryporhynchidae is confirmed, and it is suggested that the Mesocestoididae should be excluded from the Cyclo- phyllidea.
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phylogeny of the orders of the eucestoda cercomeromorphae based on comparative morphology historical perspectives and a new working hypothesis
Journal of Parasitology, 1997Co-Authors: Eric P Hoberg, Daniel R. Brooks, Jean Mariaux, Jean-lou Justine, P J WeekesAbstract:: The phylogeny of the Eucestoda was evaluated based on a suite of 49 binary and multistate characters derived from comparative morphological and ontogenetic studies; attributes of adult and larval tapeworms were considered. A single most parsimonious tree (MPT) (consistency index = 0.872; retention index = 0.838; and homoplasy index = 0.527) was fully resolved and is specified by the following: (Gyrocotylidea, (Amphilinidea, ((Spathebothriidea, (Pseudophyllidea, ((Diphyllidea, (Trypanorhyncha, (Tetraphyllidea, (Lecanicephalidea, ((Nippotaeniidea, (Tetrabothriidea, Cyclophyllidea)), Proteocephalidea))))), Haplobothriidea))), Caryophyllidea))). Monophyly for the Eucestoda was firmly corroborated. Trees derived from the primary and bootstrap analyses were congruent, but low values, particularly for relationships among the tetrafossate tapeworms, indicated additional examination is warranted. The MPT was found to be the most efficient hypothesis for describing character evolution and in specifying relationships among the orders when compared to those concepts that had been developed for the tapeworms over the past century. Areas of congruence were shared among the current hypothesis and one or more of the prior hypotheses. Major conclusions include: (1) Caryophyllidea are basal and monozooy is ancestral; (2) difossate forms are primitive, and the Pseudophyllidea are the sister group of the strongly polyzoic tapeworms; (3) Nippotaeniidea are highly derived; (4) the higher tapeworms (Tetraphyllidea, Lecanicephalidea, Proteocephalidea, Nippotaeniidea, Tetrabothriidea, and Cyclophyllidea) are closely related or potentially coordinate groups: (5) Tetrabothriidea and the Cyclophyllidea are sister groups; and (6) Tetraphyllidea is paraphyletic, with the Onchobothriidae basal to the Phyllobothriidae. Character support for placement of the Tetrabothriidea continues to be contradictory, and this order may represent a key to understanding the phylogeny of the higher cestodes. The current study constitutes a complete historical review and poses a new and robust hypothesis for the phylogeny of the Eucestoda.
M. T. Galan-puchades - One of the best experts on this subject based on the ideXlab platform.
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HUMAN BRAIN ABSCESS DUE TO A TETRA-ACETABULATE PLEROCERCOID METACESTODE (Cyclophyllidea)
The American journal of tropical medicine and hygiene, 2005Co-Authors: Yves J. F. Garin, M. T. Galan-puchades, Antoine Moulignier, Gilles Robert, F. Heran, Marc Polivka, Peter D. Olson, Frédéric Lorenzo, Francis Derouin, David Bruce ConnAbstract:A 38-year-old man living near Phnom Penh (Cambodia) was admitted to a hospital in Paris in June 2001 for a single episode of a generalized grand mal seizure. This episode was preceded by a 9-month history of headaches. Magnetic resonance imaging (MRI) of the head revealed a rounded lesion immediately ahead of the left central sulcus. The resected lesion was about 20 mm in diameter. Histologic examination revealed an elongated but unsegmented metacestode at the center of the lesion. Polymerase chain reaction (PCR) analysis was inconclusive due to formalin-based histologic processing of the tissue. Morphologic analysis based on the histologic sections revealed that the metacestode was a tetra-acetabulate plerocercoid of the order Cyclophyllidea, with a distinct rostellum and pseudosegmentation of the dorsoventrally flattened hindbody. This is the first report of a tetra-acetabulate plerocercoid from a human host and the first report of any Cyclophyllidean plerocercoid from the human brain. After 6 weeks, the patient was asymptomatic, neurologic examination was normal, and the brain MRI showed only surgical cavitation. The patient returned to Cambodia.
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Description de
EDP Sciences, 1Co-Authors: Santiago Mas-coma, Roger Fons, M. T. Galan-puchades, M. A. ValeroAbstract:Description et différenciation de l’adulte de Hymenolepis cerberensis n. sp. (Cestoda : Hymenolepididae), parasite intestinal de la Musaraigne étrusque, Suncus etruscus (Savi, 1822) (Insectivora : Soricidae : Crocidurinae) capturée sur les communes de Banyuls-sur-Mer et Cerbère (Pyrénées-Orientales, France). La nouvelle espèce est caractérisée par la taille des individus gravides et la présence de 18-21 crochets rostraux de 18,5-20 µm de longueur et de filaments autour de l’embryophore. La composition générale de la faune de Cyclophyllidea parasites de S. etruscus est analysée. Il s’agit de trois Hymenolepis peu spécialisés à scolex du même type et d’un Pseudhymenolepis, avec absence d’espèces inermes et sans rostre. Le caractère oioxène des Cestodes parasites d’espèces de Suncus appuient la validité du genre Suncus. La ressemblance des Cestodofaunes des genres Suncus et Crocidura suggère une relation phylétique très étroite entre ces deux genres de Crocidurinae
