A comparison of the spermatozoa of oratosquilla stephensoni and squilla mantis (crustacea, stomatopoda) with comments on the phylogeny of the malacostraca

Jamieson B.G.M. (1989) A comparison of the spermatozoa of oratosquilla stephensoni and squilla mantis (crustacea, stomatopoda) with comments on the phylogeny of the malacostraca. Zoologica Scripta, 18 4: 509-517.

Author Jamieson B.G.M.
Title A comparison of the spermatozoa of oratosquilla stephensoni and squilla mantis (crustacea, stomatopoda) with comments on the phylogeny of the malacostraca
Journal name Zoologica Scripta   Check publisher's open access policy
ISSN 0300-3256
Publication date 1989
Sub-type Article (original research)
Volume 18
Issue 4
Start page 509
End page 517
Total pages 9
Subject 1103 Clinical Sciences
Abstract Each stomatopod sperm, aflagellate and obovoid, is surrounded by an electron dense coat. A spermatophore is absent. The discus-shaped acrosome vesicle is penetrated and underlain by a straight, slender acrosome rod (perforatorium) ensheathed, below the vesicle, in subacrosomal material. Feulgen-positive granular material, indicating chromatin, fills most of the length of the cell but there is no certain nuclear membrane. Two centrioles, consisting of doublets each with a radial "foot" as in decapods and peracarids, occur near the acrosome and like it are embedded in the chromatin. Myelin-like membranes are associated with degenerating mitochondria in the posterior region of the cell. Thiéry-positive granules are aggregated as a glycogen body posteriorly in the cell. Spermatozoal ultrastructure confirms monophyly of the mysid-amphipod-isopodcumacean section of the Peracarida but affinities of the tanaids are uncertain. A closer phylogenetic relationship of Phyllocarida to the Branchiopoda than to the Malacostraca is suggested. A weak similarity (synapomorphy?) of syncarids and peracarids is the filiform perforatorium bipassing the nucleus. Stomatopods resemble decapods in their diffuse sperm chromatin but are placed below the syncarid-peracarid-decapod assemblage.
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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