Ultrastructure of spermatogenesis in the white clam Chione californiensis (Broderip, 1835) (Mollusca: Pelecypoda).

From: Journal of Shellfish Research | Date: August 1, 2006| Author: | Copyright information

ABSTRACT Although studies of this species have focused on its reproductive cycle, there is no literature available on the ultrastructure of its germ cells. This study consequently aims to describe the latter cells as well as the shape of the acrosome, a character that may be of help in the taxonomic allocation of species of this family or other bivalve families. Results indicate spermatogonia have a central, spherical nucleus as well as scattered heterochromatin granules throughout the nucleoplasm. Rough endoplasmic reticulum is scarce, but the cytoplasm is rich in mitochondria ...

Read all of this article with a FREE trial to HighBeam Research

Related newspaper, magazine, and trade journal articles from HighBeam Research

(Including press releases, facts, information, and biographies)

Localization of the DAZ gene expression in seminiferous tubules of patients with spermatogenic disorders
; ...arrest at the spermatocyte stage, the DAZ gene transcripts were also found in primary spermatocytes. However, the fluorescence intensity of primary spermatocytes, except the fluorescence of the spermatocytes localised upon the lumen, was...
Reproductive cycle of the western skink, Eumeces skiltonianus (Sauria: Scincidae), in southern California.(GENERAL NOTES)
; ...sperm. Layers of metamorphosing spermatids and primary spermatocytes were present. The outer layer of each seminiferous...germinal epithelium in the seminiferous tubules. Primary spermatocytes were the predominant cell. Secondary spermatocytes and occasional spermatids were present ...
Notes on reproduction in the Mexican west coast rattlesnake, Crotalus basiliscus (Serpentes: Viperidae).(GENERAL NOTES)
; ...e., renewal of germinal epithelium for the next period of spermato-cytogenesis and then spermiogenesis). Primary and secondary spermatocytes as well as spermatids (no spermatozoa) were present in the latter specimen; the vas deferens contained spermatozoa...
Antispermatogenic, antiandrogenic activities of Albizia lebbeck (L.) Benth bark extract in male albino rats.
; ...male fertility by 100%. Marked decline in the germ cell population was noticed. Population of preleptotene, pachytene, secondary spermatocytes and step-19 spermatid were declined by 60.86%, 65.81%, 71.56% and 66.55%, respectively. Cross-sectional surface area...
Reproductive cycle of the sidewinder, Crotalus cerastes (Serpentes: Viperidae), from California.
; ...testis, seminiferous tubules contained spermatogonia and Sertoli cells. There was a proliferation of germ cells; primary and secondary spermatocytes and occasional spermatids were present in testes undergoing recrudescence. During spermiog
Reproduction in the western hognose snake, Heterodon nasicus (Serpentes: Colubridae) from the southwestern part of its range.(GENERAL NOTES)
; ...recrudescence (recovery) there was renewal of spermatogenic cells characterized by spermatogonial divisions; primary and secondary spermatocytes were typically present. In spermiogenesis, metamorphosing spermatids and mature sperm were present. Testes undergoing...
Reproduction in the San Lucan alligator lizard, Elgaria paucicarinata (Anguidae) from Baja California Sur, Mexico.(Research Notes)
; ...cycle are presented in Table 1. Testes of E. paucicarinata in recrudescence (May-August) contained spermatogonia and primary spermatocytes. Spermatids were occasionally observed but no sperm were present. Testes undergoing spermiogenesis (August, October and...
Reproduction in the San Lucan banded rock lizard, Petrosaurus thalassinus (Phrynosomatidae) from Baja California Sur, Mexico.(Research Notes)
; ...May-September) contained spermatogonia and Sertoli cells. The single testis in recrudescence (May) exhibited a proliferation of primary spermatocytes for the next period of spermiogenesis. Testes undergoing spermiogenesis (February-May) contained rows of metamorphosing...
Observaciones morfohistológicas del testículo y espermatozoides de Microlophus peruvianus (Lesson, 1826) (Sauria:Tropiduridae).
; ...4513), primary espermatocitos (4.864 m[micro][+ ó -] 0.5292), spermatids (2.85 m[micro] [+ ó -] 0.4071); No secondary spermatocytes where founded. The morphology and biometry of the spermatozoon of M. peruvianus proposes its importance as taxonomic...
Reproduction in the Baja California rattlesnake, Crotalus enyo.
; ...In recrudescence, there was renewal of spermatogenic cells characterized by spermatogonial divisions and primary and secondary spermatocytes were occasionally present. In spermiogenesis, metamorphosing spermatids and mature sperm were present. Males undergoing...