NDLI: Spermatological characters of monozoic tapeworms (Cestoda: Caryophyllidea), including first data on a species from the Indomalayan catfish.

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Spermatological characters of monozoic tapeworms (Cestoda: Caryophyllidea), including first data on a species from the Indomalayan catfish.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yoneva, Aneta Levron, Céline Ash, Anirban Scholz, Tomás
Description	Country affiliation: Bulgaria Author Affiliation: Yoneva A ( Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia, Bulgaria. anetayoneva@gmail.com)
Abstract	The ultrastructure of spermiogenesis and mature spermatozoon in Lytocestus indicus (Cestoda: Lytocestidae) is described; this is the first representative of this group of monozoic, presumably most basal, tapeworms (Eucestoda) from the Indomalayan region to be documented in this manner. Similarly, as in other caryophyllideans, its spermiogenesis involves the formation of a conical differentiation zone with 2 centrioles associated with striated roots and an intercentriolar body. In the course of the process, 1 of the centrioles develops a free flagellum, which fuses with a cytoplasmic protrusion, whereas the other remains oriented in a cytoplasmic bud. Spermiogenesis is also characterized by the presence of electron-dense material in the early stages of spermiogenesis and a slight rotation of the flagellar bud. The mature spermatozoon of L. indicus is a filiform cell tapered at both extremities that lacks mitochondria; its nucleus has parallel disposition to the axoneme and does not reach up to the posterior extremity of the spermatozoon, which is typical for spermatozoa of the type III pattern. The new data confirm that caryophyllideans share the same type of spermiogenesis that is considered to be plesiomorphic in the Eucestoda. The existing information on spermatological ultrastructure of 8 members for 3 of 4 caryophyllidean families from different host groups (cyprinids and catostomids, both Cypriniformes, and mochokids and clariids, both Siluriformes) from 4 zoogeographical regions (Palearctic, Neotropic, Ethiopian, and Indomalayan regions) demonstrates great uniformity in spermiogenesis and sperm ultrastructure, which does not reflect different taxonomic position of the species studied.
File Format	HTM / HTML
ISSN	00223395
Issue Number	2
Volume Number	98
e-ISSN	19372345
Journal	Journal of Parasitology
Language	English
Publisher	American Society of Parasitologists
Publisher Date	2012-04-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Parasitology Catfishes Parasitology Cestoda Physiology Cestode Infections Veterinary Fish Diseases Spermatogenesis Animals Ultrastructure Male Microscopy, Electron, Transmission Spermatozoa Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Medicine Parasitology Ecology, Evolution, Behavior and Systematics

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