FINE STRUCTURE OF THE MATURE SPERM OF THE LAND SNAIL COCHLICELLA ACUTA (MÜLLER, 1774) (GASTROPODA: STYLOMMATOPHORA)
Mohamed F.A. Mansour
Heba M.I. Falla.
Abstract
The fine structure of the sperm of a pulmonate land snail Cochlicella acuta (Cohlicellidae) was examined. The present results indicated that the morphology of the spermatozoon of the land snail C. acuta seems to be quite similar to that of the advanced stylommatophoran sperms. The acrosome is a conical-shaped structure, with lighter pedestal and a curved basal part extends posteriorly around the anterior tip of the nucleus. The nucleus is not helical but having a keel into which a nuclear fossa is invaginated. The neck region forming of the centriolar derivative represents the point of origin of coarse fibers. The axoneme exhibits a 9+2 pattern. The mid-piece is elongate and composed of paracrystalline and matrix materials (collectively, the mitochondrial derivative). It encloses a single glycogen helix and the axoneme. The mitochondrial derivative extends to the posterior end of the spermatozoon. Both annulus and a glycogen piece are absent.
The articles in Bibliomed are open access articles licensed under Creative Commons Attribution 4.0 International License (CC BY), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
We use cookies and other tracking technologies to work properly, to analyze our website traffic, and to understand where our visitors are coming from. More InfoGot It!
