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Shell length comparison of two samples of rare deep-sea bivalve mollusc Idas simpsoni (Marshall, 1900) from middle and south Adriatic Sea

A small population of the whale bone-associated, deep sea bivalve Idas simpsoni was recovered on the maxillar bone of a fin whale Balaenoptera physalus, trawled up near the island of Vis in the middle Adriatic Sea from the depth of 120 m. In this paper basic biometric and population structure of forementioned species is presented. The data acquired from this population is compared to set of data from previous finding of Idas simpsoni trawled in 2003 off the island of Mljet, south Adriatic Sea, from the depth of 430 m. The comparison showed that there is strong positive statistical relationship between the size of the shell and the depth (F=48, 017).

whale bone ; Mytilidae ; chemoautotrophy ; island of Vis

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