Further twists in gastropod shell evolution

Biology Letters
Reuben ClementsMenno Schilthuizen

Abstract

The manner in which a gastropod shell coils has long intrigued laypersons and scientists alike. In evolutionary biology, gastropod shells are among the best-studied palaeontological and neontological objects. A gastropod shell generally exhibits logarithmic spiral growth, right-handedness and coils tightly around a single axis. Atypical shell-coiling patterns (e.g. sinistroid growth, uncoiled whorls and multiple coiling axes), however, continue to be uncovered in nature. Here, we report another coiling strategy that is not only puzzling from an evolutionary perspective, but also hitherto unknown among shelled gastropods. The terrestrial gastropod Opisthostoma vermiculum sp. nov. generates a shell with: (i) four discernable coiling axes, (ii) body whorls that thrice detach and twice reattach to preceding whorls without any reference support, and (iii) detached whorls that coil around three secondary axes in addition to their primary teleoconch axis. As the coiling strategies of individuals were found to be generally consistent throughout, this species appears to possess an unorthodox but rigorously defined set of developmental instructions. Although the evolutionary origins of O. vermiculum and its shell's functional significanc...Continue Reading

References

May 23, 1978·Biochimica Et Biophysica Acta·T P Chirpich
Jan 5, 1995·Nature·W D Willis
Dec 7, 2005·Evolution; International Journal of Organic Evolution·Satoshi Chiba
Apr 1, 1961·Proceedings of the National Academy of Sciences of the United States of America·D M Raup
Nov 9, 2006·Evolution; International Journal of Organic Evolution·Menno SchilthuizenJaap J Vermeulen
Mar 12, 1965·Science·D M Raup, A Michelson
Sep 1, 1987·Evolution; International Journal of Organic Evolution·David S Woodruff, Stephen Jay Gould

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