Molluscan ResearchISSN 1323-5818
 An international journal of the Malacological Society of Australasia and 
the Society for the Study of Molluscan Diversity published by Magnolia Press

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Molluscan Research 30(1): 25-28; published 31 Mar. 2010
Copyright © The Malacological Society of Australasia & the Society for the Study of Molluscan Diversity

Inverse life positions of three species in the genus Cadella (Bivalvia: Tellinidae)

¹Department of Earth and Planetary Sciences, Graduate School of Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka,812-8581, Japan. Email
²Kyushu University Museum, address as above.


Bivalves have particular life orientations for each species. Species of Tellinidae and Semelidae burrow in sediment and are orientated with their commissure plane nearly horizontal and almost always rest on their left side. However, three species of the tellinid genus Cadella, which have the commissure plane nearly horizontal, lie on their right side. It is suggested that this reversed orientation in Cadella is an inversion of the normal left side orientation and appears to be the first example of behavioural inversion in bivalves.

Key words: Infaunal bivalves, Cadella, Tellinidae, burrowing behaviour

Full article (PDF; 100 KB) 

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