Relationships of the Cyclodorippoidea Ortmann: evidence from spermatozoal ultrastructure in the generaXeinostoma, TymolusandCymonomus(Crustacea, Decapoda)
| Autor: | B. Richer de Forges, Danièle Guinot, Barrie G. M. Jamieson |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Invertebrate Reproduction & Development. 26:153-164 |
| ISSN: | 2157-0272 0792-4259 |
| DOI: | 10.1080/07924259.1994.9672412 |
| Popis: | Summary The spermatozoa of two genera and species of Cyclodorippidea, Xeinostoma richeri (Xeinostominae) and Tymolus sp. (Cyclodorippinae), and one species of Cymonomus sp. (Cymonomidae) are found to constitute a distinctive cyclodorippoid sperm-type characterized by (1) sperm anteroposteriorly depressed, mean ratio of length to width 0.54–0.63; (2) operculum extending to the lateral limits of the acrosome (autapomorphy of cyclodorippoids) and centrally perforate or (Cymonomus sp.) thinner; (3) contents of acrosome vesicle with two major horizontal zones, as in homolids and dynomenids, including a dense lower (posterior) zone; (4) perforatorium very wide (0.3 width of acrosome), anteriorly rounded, not capitate, lacking radiate projections; (5) acrosomal capsule with external projections over its posterior half; (6) slender dense filaments extending into the perforatorium from its walls, their bases associated with corrugations of its basal wall; (7) nucleus, cupping the acrosome and cytoplasm, with well-... |
| Databáze: | OpenAIRE |
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