Functional morphology of Grammatodon inaequivalvis (Goldfuss) and implications for evolutionary pathways in arcoidean bivalves |
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| Authors: | Walter Etter |
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| Institution: | (1) Naturhistorisches Museum, Augustinergasse 2, 4001 Basel, Switzerland |
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| Abstract: | Secondary soft-bottom dwellers evolved several times in the Arcoida. These include semi-infaunal endobyssate taxa and free-burrowing
species. The Jurassic arcoid bivalve Grammatodon inaequivalvis (Goldfuss, 1837) is remarkable for showing different sculptures on its left and right valve. A functional analysis of the shell points to
a reclining mode of life on soft bottoms. This interpretation is corroborated by the occurrence of this species in very fine-grained
sediments, and by taphonomic patterns such as “butterflied” preservation. It is proposed here that this species was resting
on its left valve on the sediment, probably without byssal attachment. This reclining mode of life of G. inaequivalvis was hitherto undescribed from soft-bottom dweller arcoid bivalves. |
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