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Clanculus bertheloti D'Orbigny, 1839: Eine brutpflegende prosobranchiate schnecke aus der brandungszone von teneriffa

Zeitschrift für Morphologie und Ökologie der Tiere, ISSN: 0720-213X, Vol: 60, Issue: 1-3, Page: 162-175
1967
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Clanculus bertheloti (Prosobranchia, Trochidae), living under stones or lavablocks in surf-beaten intertidal rock-pools of the Canary Islands and Madeira, broods its eggs and developing embryos in the spiral furrows of its own shell, which is covered by a tough sheat of mucus. The sexes are separate. Although male copulatory organs are missing, brood will be deposited on shells of females as well as males, the females usually carrying the larger broods. A "pseudoeopulation" must occur, during which the female probably, after having packed her own shell with eggs, will transfer the spare portion of its brood to the shell of the assisting male. In nature the animals often occur in pairs. The development is direct, without any pelagic larval life. About 80 % of the eggs and embryos seem to survive to the stage when the creeping young leave the shells of their parents. Within the months January to April 3 broods are probably produced. A single female may produce a new brood as soon as the former brood has hatched. A single brood of a large female, distributed on the shells of the female and the assisting male, may comprise about 330 to 530 embryos. © 1967 Springer-Verlag.

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