Marine Biodiversity and Ecosystem Functioning
EU Network of Excellence

 
Main Menu

· Home
· Contacts
· Data Systems
· Documents
· FAQ
· Links
· MarBEF Open Archive
· Network Description
· Outreach
· Photo Gallery
· Quality Assurance
· Register of Resources
· Research Projects
· Rules and Guidelines
· Training
· Wiki
· Worldconference

 

Register of Resources (RoR)

 People  |  Datasets  |  Literature  |  Institutes  |  Projects 

[ report an error in this record ]basket (1): add | show Print this page

one publication added to basket [283742]
Ultrastructure of sperm development in the free-living marine nematode Metachromadora itoi (Chromadoria, Desmodorida)
Yushin, V.V.; Coomans, A. (2005). Ultrastructure of sperm development in the free-living marine nematode Metachromadora itoi (Chromadoria, Desmodorida). Acta Zool. (Stockh.) 86(4): 255-265. http://dx.doi.org/10.1111/j.1463-6395.2005.00207.x
In: Acta Zoologica (Stockholm). Svenska Bokfoerlaget: Stockholm. ISSN 0001-7272; e-ISSN 1463-6395
Peer reviewed article  

Available in  Authors 

Keywords
    Chromadorida [WoRMS]; Tylenchida [WoRMS]
    Marine/Coastal
Author keywords
    spermatozoa;spermatogenesis;gametogenesis;centriole;fibrous bodies;membranous organelles;pseudopod;Chromadorida;Tylenchida

Authors  Top 
  • Yushin, V.V.
  • Coomans, A.

Abstract
    The spermatogenesis of the free-living marine nematode Metachromadora itoi was studied with electron microscopy. Spermatocytes and early spermatids have no cytoplasmic components specific for nematodes, i.e. membranous organelles (MO) and fibrous bodies (FB). The late spermatids are subdivided into the residual body and the main cell body with a centrally located nucleus devoid of a nuclear envelope. A pair of 9 × 2 centrioles is associated with the nuclei of spermatids and spermatozoa. The nucleus of the mature spermatid is surrounded by a thick mass of radially arranged FB delimited externally by a discontinuous layer of mitochondria, which underlie a thin ectoplasm. Sperm development is accompanied by transfer of FB matter through the mitochondrion layer into the ectoplasm. The immature spermatozoa from the testis have the centrally located nucleus surrounded by a transparent halo with remnants of FB. The halo is delimited by a sphere of mitochondria that underlie the thick fibrous ectoplasm, a derivative of the FB. In the mature spermatozoa the ectoplasm is transformed into the prominent unpolarized pseudopod. The central nucleus is surrounded by a transparent halo and a sphere of mitochondria, which underlie the pseudopod. MO were not found throughout spermatogenesis. In general, spermatogenesis in M. itoi differs from that observed in many nematodes but resembles in some details the sperm development in some chromadorid and tylenchomorph nematodes. The phylogenetic importance of this sperm development is discussed.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors 


If any information here appears to be incorrect, please contact us
Back to Register of Resources
 
Quick links

MarBEF WIKI

Erasmus Mundus Master of Science in Marine Biodiversity and Conservation (EMBC)
Outreach

Science
Responsive Mode Programme (RMP) - Marie Nordstrom, copyright Aspden Rebecca

WoRMS
part of WoRMS logo

ERMS 2.0
Epinephelus marginatus Picture: JG Harmelin

EurOBIS

Geographic System

Datasets

 


Web site hosted and maintained by Flanders Marine Institute (VLIZ) - Contact data-at-marbef.org