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Titolo:
Morphology and reproduction of Nipponomysella subtruncata (Yokoyama), a galeommatoidean bivalve commensal with the sipunculan Siphonosoma cumanense (Keferstein) in Japan
Autore:
Lutzen, J; Takahashi, T; Yamaguchi, T;
Indirizzi:
Univ Copenhagen, Inst Zool, DK-2100 Copenhagen, Denmark Univ Copenhagen Copenhagen Denmark DK-2100 , DK-2100 Copenhagen, Denmark Prefectural Univ Kumamoto, Fac Environm & Symbiot Sci, Kumamoto 8628502, Japan Prefectural Univ Kumamoto Kumamoto Japan 8628502 Kumamoto 8628502, Japan Aitsu Marine Biol Stn, Kumamoto 8616102, Japan Aitsu Marine Biol Stn Kumamoto Japan 8616102 tn, Kumamoto 8616102, Japan
Titolo Testata:
JOURNAL OF ZOOLOGY
, volume: 254, anno: 2001,
parte:, 4
pagine: 429 - 440
SICI:
0952-8369(200108)254:<429:MARONS>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MYSELLA-TUMIDA; GALEOMMATACEA;
Keywords:
bivalvia; commensalism; Nipponomysella subtruncata; reproduction; seminal receptacle; Siphonosoma cumanense;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Lutzen, J Univ Copenhagen, Inst Zool, Univ Pk 15, DK-2100 Copenhagen, Denmark Univ Copenhagen Univ Pk 15 Copenhagen Denmark DK-2100 , Denmark
Citazione:
J. Lutzen et al., "Morphology and reproduction of Nipponomysella subtruncata (Yokoyama), a galeommatoidean bivalve commensal with the sipunculan Siphonosoma cumanense (Keferstein) in Japan", J ZOOL, 254, 2001, pp. 429-440

Abstract

The shell and anatomy of Nipponomysella subtruncata is described. The bivalve is attached singly or in groups of up to nine on Siphonosoma cumanense,a burrowing intertidal sipunculan in south-west Japan. The species is a protandrous hermaphrodite. Specimens 1.4-2.5 mm long are males, which between2.1 and 3 mm in length reverse sex and remain females. Reproduction peaks in summer and the annual number of clutches is small. Ripe oocytes, 84-88 mum diameter, are spawned into the suprabranchial cavity where they develop into 107-mum-long straight-hinged veligers. Following a planktotrophic period of unknown duration, the c. 360-mum-long spat normally settle upon and attach to the shells of larger, predominantly female, individuals. At a length of 1-1.6 mm they detach again and live separately thereafter. Sperm are transferred in spermatophores and stored within paired, mushroom-shaped receptacles located posteriorly in the female's suprabranchial cavity. The receptacles first appear in large males or in specimens in the process of reversing sex. Stored sperm probably survive long enough to fertilize more thanone clutch. The anatomy of Nipponomysella is characteristic of the Montacutidae, and is of especial interest because of the unique structure of the sperm receptacles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 23:14:38