Sperm and spermiogenic ultrastructure in the mathildidae with a review of sperm morphology and its systematic importance in the architectonicoidea (gastropoda)

Healy J.M. (1995) Sperm and spermiogenic ultrastructure in the mathildidae with a review of sperm morphology and its systematic importance in the architectonicoidea (gastropoda). Journal of Molluscan Studies, 61 3: 361-373. doi:10.1093/mollus/61.3.361


Author Healy J.M.
Title Sperm and spermiogenic ultrastructure in the mathildidae with a review of sperm morphology and its systematic importance in the architectonicoidea (gastropoda)
Journal name Journal of Molluscan Studies   Check publisher's open access policy
ISSN 0260-1230
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1093/mollus/61.3.361
Open Access Status Not yet assessed
Volume 61
Issue 3
Start page 361
End page 373
Total pages 13
Subject 1804 Statistics, Probability and Uncertainty
2604 Applied Mathematics
2303 Ecology
1105 Dentistry
1103 Clinical Sciences
1104 Complementary and Alternative Medicine
Abstract The ultrastructure of spermiogenesis and spermatozoa is examined for the first time in the heterogastropod family Mathildidae (Mathilda brevicula Bavay and Mathilda sp.). Mathildid spermatozoa exhibit the following features: (1) an ovoid acrosomal vesicle showing curved dense layers basally and underlain by a thin curved plate; (2) a solid, rod-shaped nucleus showing a shallow basal invagination (nucleus helically keeled in Mathilda sp.); (3) a midpiece composed of a 9+2 axoneme, 9 thick and periodically banded coarse fibres (associated with the axonemal doublets) and a continuous mitochondrial derivative; (5) glyco-gen piece composed of the axoneme surrounded by dense granules; (6) and end piece (paddle-shaped terminally). Results of the study demonstrate that mathildids share the same key sperm and spermi-ogenic features observed in the Architectonicidae. The monophyly of the Architectonicoidea, established by previous authors on anatomical grounds, is therefore confirmed using sperm morphology. Spermatozoa of the two mathildids investigated lack the periodically banded midpiece structures seen in investigated species of Architectonica (A. pcrspectiva (Linnaeus), A. perdix (Hinds)), Heliacus (H. (Heliacus) variegatus (Gmelin)) and Pseudotorinia (P. laseronorum (Iredale)) thereby resembling most closely the spermatozoaof Philippia lutea (Lamarck) and Psilaxis oxytropis (A. Adams) which also lack suchbanded structures. Given the widely accepted primitive status of the Mathildidae within the Architectonicoidea, the genera Philippia and Psilaxis may prove to be relatively basal rather than advanced genera within the Architectonicidae. Thi: view needs to be tested by examination of sperm morphology in other genera of the Architectonicidae and also the basal mathildid genus Tuba sensu lato (= Gegania + Tubena). Such information will be vital in any future cladistic study of the Architectonicoidea.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

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