Euspermatozoa and paraspermatozoa in the trochoid gastropod Zalipais laseroni (Trochoidea: Skeneidae)

Healy J.M. (1990) Euspermatozoa and paraspermatozoa in the trochoid gastropod Zalipais laseroni (Trochoidea: Skeneidae). Marine Biology, 105 3: 497-507. doi:10.1007/BF01316321

Author Healy J.M.
Title Euspermatozoa and paraspermatozoa in the trochoid gastropod Zalipais laseroni (Trochoidea: Skeneidae)
Journal name Marine Biology   Check publisher's open access policy
ISSN 0025-3162
Publication date 1990-01-01
Sub-type Article (original research)
DOI 10.1007/BF01316321
Volume 105
Issue 3
Start page 497
End page 507
Total pages 11
Publisher Springer-Verlag
Subject 1104 Complementary and Alternative Medicine
Abstract Pronounced sperm dimorphism is reported for the first time in the prosobranch order Vetigastropoda. Using transmission electron microscopy, it is demonstrated that Zalipais laseroni Kershaw (Trochoidea: Skeneidae) produces uniflagellate euspermatozoa (eupyrene, fertile sperm) and multiflagellate paraspermatozoa (oligopyrene, infertile sperm). Euspermatozoa show the following features: (1) a conical acrosomal vesicle; (2) a long tubular, helically coiled nucleus; (3) a short midpiece (mitochondrial sleeve surrounding a 3 μm-long electron-dense rod); (4) a chambered body (? fused centrioles) continuous with the dense rod of the midpiece; (5) a flagellum (characterized by an electron-dense sheath surrounding and partly obscuring the central pair of tubules). Paraspermatozoa are composed of an elongate head (lacking an acrosomal complex), a short midpiece (centriolar rods interspersed with mitochondria), and a posterior tuft of flagella. The head consists of a rodshaped anterior body and a condensed nuclear remnant - the latter lodged in a shallow invagination of the anterior body. Multiple flagella are attached via centriolar rods to a layer of dense material lining the nuclear remnant membrane. During paraspermatozoan development, the nucleus partially degenerates, then condenses, while the endoplasmic reticulum (ER), apparently assisted by the Golgi complex, is responsible for production of numerous, electron-dense secretory vesicles. These vesicles subsequently fuse to form the elongate, anterior body of the head region. The ability of at least one line of trochoid gastropods to produce an oligopyrene, multiaxonemal paraspermatozoon, suggests that the Caenogastropoda (with this feature) might have been derived from the Vetigastropoda rather than from any other archaeogastropod source.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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