Ultrastructure of sperm development and mature sperm morphology in three species of commensal bivalves (Galeommatoidea)

Data di pubblicazione: 1990

Da: ConchBooks, Harxheim, GermaniaConchBooks

Venditore con 3 stelle

Venditore AbeBooks dal 1 marzo 2007

Condizione: Usato

EUR 6,00

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Spedito da Germania a U.S.A.

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Descrizione dell’articolo da parte del venditore

Ultrastructural features of the ovotestes, spermatogenesis, and the mature sperm are described for three galeommatid bivalves, Divariscintilla yoyo, Divariscintilla troglodytes, and Scintilla sp., from stomatopod burrows in eastern Florida. All three species yielded similar results except with respect to mature sperm dimensions. The ovotestis contains three types of somatic cells within the testicular portion: flattened myoepithelial cells defining the outer acinal wall; underlying pleomorphic follicle cells containing abundant glycogen deposits; and scattered, amoeboid cells containing lysosomal-like inclusions which are closely associated with developing sperm. Early spermatogenesis is typical of that reported from other bivalves. In contrast, the late stages of spermiogenesis involve the migration and gradual rotation of the acrosomal vesicle, resulting in a mature acrosome tilted about 70? from the long axis of the cell. The mature sperm possesses an elongated, slightly curved nucleus; a subterminal, concave acrosome with a nipple-like central projection; five spherical mitochondria and two centnoles in the middlepiece; and a long flagellum. The rotational asymmetry and the presence of perimitochondrial glycogen deposits in these sperm are unusual in the Bivalvia and may be associated with fertilization specializations and larval brooding common among galeommatoideans. 13 pp., 29 figs, gr. 8.…

Codice articolo W06269

Dati bibliografici

Titolo
Ultrastructure of sperm development and mature sperm morphology in three species of commensal bivalves (Galeommatoidea)
Autore
Eckelbarger, K. J., Bieler, R. & Mikkelsen, P. M.
Anno di pubblicazione
1990

ConchBooks

Harxheim, Germania

Venditore con 3 stelle

Venditore AbeBooks dal 1 marzo 2007

Tariffe di spedizione da Germania a U.S.A.

ArticoloDa 25 a 45 giorni lavorativiDa 8 a 14 giorni lavorativi
Primo articoloEUR 24,00EUR 34,00
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Descrizione dello Store

Founded in 1985 we are specialized in worldwide literature on Mollusca and marine invertebrates. Our publishing house has meanwhile published approximately 60 titles on that field of interest. We have stocks of most available international books on Malacology and a huge amount of antiquarian literature, even of the latter most titles are only available once.

Specializzazione

Weichtiere / Shells, Schnecken / Snails & Slugs, Muscheln / Bivalves, Tintenfische / Squids / Octopusses / Ammonites, Malacology, Conchology, Marine Biology