Document Detail

The male genital system of the New World Ricinulei (Arachnida): ultrastructure of spermatozoa and spermiogenesis with special emphasis on its phylogenetic implications.
MedLine Citation:
PMID:  18539528     Owner:  NLM     Status:  MEDLINE    
This study is the first report on the male genital system and the sperm structure of the South American genus Cryptocellus and provides a second description for the Central American genus Pseudocellus. The spermatids of the Colombian species Cryptocellus narino are elongated and anteriorly lentoid-shaped due to two conspicuous intracellular electron-dense plates. Two cell protrusions are present, which contain in front of the lentoid part the acrosomal complex and parts of the axoneme and nucleus, and behind the lentoid part the continuing axoneme and nucleus. The acrosomal filament originates from a cap-like acrosomal vacuole, extends into the nuclear canal and ends behind the lentoid part. The nucleus runs parallel to the axoneme. The axoneme possesses a typical 9+2 microtubular pattern. At the end of spermiogenesis the acrosomal complex, nucleus and axoneme coil within the cell forming cleistospermia as transfer form. Our results of Pseudocellus pearsei confirm an earlier study on that genus which is considered to be not closely related to Cryptocellus. According to the present study the sperm structure of the observed Cryptocellus species is very similar to what is described for Pseudocellus.
G Talarico; L F García Hernández; P Michalik
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-02-14
Journal Detail:
Title:  Arthropod structure & development     Volume:  37     ISSN:  1873-5495     ISO Abbreviation:  Arthropod Struct Dev     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-06-16     Completed Date:  2008-09-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100972232     Medline TA:  Arthropod Struct Dev     Country:  England    
Other Details:
Languages:  eng     Pagination:  396-409     Citation Subset:  IM    
Zoologisches Institut und Museum, Ernst-Moritz-Arndt-Universität Greifswald, Johann-Sebastian-Bach-Strasse 11/12, 17489 Greifswald, Germany.
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MeSH Terms
Axoneme / ultrastructure
Genitalia, Male / anatomy & histology*
Microscopy, Electron
Species Specificity
Spermatogenesis / physiology*
Spermatozoa / ultrastructure*
Spiders / anatomy & histology*,  genetics,  physiology

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