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842
GUBANOV, A. P., PEEL, J. S., PIANOVSKAYA, I. A. 1995. Soft-sediment adaptations in a new Silurian gastropod from Central Asia. Palaeontology, 38, 4, 831–842.
A. P. Gubanov, J. S. Peel and I. A. Pianovskaya Specimens of the gastropod Isfarispira septata gen. et sp. nov., from the Silurian of Central Asia, are characterized by a large, lenticular, multi-whorled shell with a flattened base, a low rate of expansion of the broad whorls, internal septa at intermediate growth stages and a prominent circumbilical flange which closed off much of the umbilicus. These morphological features reflect adaptation to life on a soft substratum, collectively serving to inhibit sinking into the soft sediment by increasing the area of the basal surface. I. septata is interpreted as a sedentary, or only infrequently mobile gastropod. The Palaeontological Association (Free Access)