ULTRASTRUCTURAL AND CYTOCHEMICAL STUDY OF SPERMATOGENESIS IN SCROBICULARIA-PLANA (MOLLUSCA, BIVALVIA)

• Type: Article in International Scientific Journal
• Date: 1989

Authors

sousa, m (Author) ICBAS; CORRAL, L (Author) Other; AZEVEDO, C (Author) Other

Journal

Title: Gamete Research

Vol. 24

Pages: 393-401

ISSN: 0148-7280

Publisher: John Wiley & Sons

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 25 Citations

Other information

Authenticus ID: P-001-SAB

DOI: 10.1002/mrd.1120240406

Abstract (EN): The ultrastructure of the mature spermatozoa and spermatogenesis of the bivalve Scrobicularia plana are described. Support cells extend from the basal lamina to the lumen of the testis and are laterally connected to the germinal epithelium. Germ cells present intercellular bridges and flagella since the spermatogonial stage. While spermatogonia and spermatocytes appear connected to support cells by desmosome-like junctions, elongated spermatids are held at the acrosomal region by support cell finger-like processes. During spermiogenesis, the acrosomal vesicle differentiates from a golgian saccule and then migrates to the nuclear apex. A microtubular manchette arising from centrioles surrounds the acrosomal vesicle, the nucleus, and the mitochondria at the time these three organelles start their elongation, disappearing after that. The mature spermatozoon of S. plana lacks a distinct midpiece because the mitochondria extend from the region of the pericentriolar complex along the nucleus anteriorly for approximately 1.4 οm. The features of this bivalve type of modified spermatozoon are compared with those of other animal groups having similar modifications.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9