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Journal Molluscan Studies Advance Access published online on June 28, 2005
Journal of Molluscan Studies, doi:10.1093/mollus/eyi035
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© The Author 2005. Published by Oxford University Studies on behalf of The Malacological Society of London, all rights reserved
Received March 23, 2004
Accepted January 10, 2005

Article

Shape differences among boreholes drilled by three species of naticid gastropods

Melissa Grey 1*, Elizabeth G. Boulding 2, and Michael E. Brookfield 3

1 Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1 Canada; Department of Earth and Ocean Sciences. University of British Columbia, Vancouver, British Columbia, V6T 1Z4 Canada
2 Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1 Canada
3 Department of Land Resource Science, University of Guelph, Guelph, Ontario, N1G 2W1 Canada

* To whom correspondence should be addressed.
Melissa Grey, E-mail: mgrey{at}eos.ubc.ca


  Abstract

Naticid gastropods leave a record of predation in the form of characteristic countersunk circular boreholes. We fed bivalve prey to naticids to test whether the ratio between the inner and outer borehole diameter differed among three Recent naticid species: Euspira heros, E. lewisii and Neverita duplicata. Fossil shells from a Miocene-aged assemblage, containing naticids previously identified as E. heros and N. duplicata, were also included in our analyses. Ratios of the inner to outer diameters of naticid boreholes in bivalve shells showed that there were significant differences in borehole shape between E. heros and the two other Recent species. We found no significant differences between the ratios of E. lewisii and N. duplicata; however, a principal component analysis showed that boreholes distinctly cluster according to species. The Miocene boreholes were also distinct from the Recent, indicating that the Miocene naticids may be a separate species from E. heros and N. duplicata. We have shown that there is a species-specific component to borehole geometry. This may have important implications for palaeobiological studies, because the index of borehole functionality, previously described as an inner to outer borehole ratio of 0.5 for all naticids, may differ between species.


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