Ultrastructure of spermiogenesis of Philippia (Psilaxis) oxytropis, with special reference to the taxonomic position of the architectonicidae (Gastropoda)

Healy J.M. (1982) Ultrastructure of spermiogenesis of Philippia (Psilaxis) oxytropis, with special reference to the taxonomic position of the architectonicidae (Gastropoda). Zoomorphology, 101 3: 197-214. doi:10.1007/BF00312434


Author Healy J.M.
Title Ultrastructure of spermiogenesis of Philippia (Psilaxis) oxytropis, with special reference to the taxonomic position of the architectonicidae (Gastropoda)
Journal name Zoomorphology   Check publisher's open access policy
ISSN 0720-213X
Publication date 1982
Sub-type Article (original research)
DOI 10.1007/BF00312434
Volume 101
Issue 3
Start page 197
End page 214
Total pages 18
Publisher Springer-Verlag
Subject 2702 Anatomy
1103 Clinical Sciences
Abstract Spermiogenesis of the architectonicid Philippia (Psilaxis) oxytropis was studied using transmission electron microscopy. Both spermatids and mature sperm of Philippia show features comparable to sperm/spermatids of euthyneuran gastropods (opisthobranchs, pulmonates) and not mesogastropods (with which the Architectonicidae are commonly grouped). These features include: (1) Accumulation of dense material on the outer membrane of anterior of the early spermatid nucleus - this material probably incorporated into the acrosome; (2) Structure of the unattached and attached spermatid acrosome (apical vesicle, acrosomal pedestal) accompanied by curved (transient) support structures; (3) Formation of the midpiece by individual mitochondrial wrapping around the axonemal complex, and the subsequent fusion and metamorphosis of the mitochondria to form the midpiece; (4) Presence of periodically banded coarse fibres surrounding the axonemal doublets and intra-axonemal rows of granules. A glycogen piece occurs posterior to the midpiece but is a feature observed in both euspermatozoa of mesogastropods (and neogastropods) and in sperm of some euthyneurans. Despite the lack of paracrystalline material or glycogen helices within the midpiece (both usually associated with sperm of euthyneurans), the features of spermiogenesis and sperm listed indicate that the Architectonicidae may be more appropriately referable to the Euthyneura than the Prosobranchia.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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