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Bien et al., 1999

Site selection and behavior of sponge and bivalve borers in shells of the cretaceous oysters Exogyra cancellata and Pycnodonte mutabilis from Delaware, U.S.A

Bien, W. F., Wendt, J. M., Alexander, R. R.
DOI
DOI10.1080/08912969909386587
Year1999
JournalHistorical Biology
Volume13
Number4
Pages299-315
Typearticle in journal
LanguageEnglish
Id50957

Abstract

In shells of the oysters Exogyra cancellata and Pycnodonte mutabilis from the Mount Laurel and Marshalltown Formations (Campanian‐Maestrichtian), three‐quarters of all valves bear sponge borings (Entobia isp.) borings and 30% have borings of a lithophagid bivalve (Gastrochaenolites isp.). Non‐random distributions of these euendoliths, documented in this paper, may in part be accounted for by differential survival of sponge and lithophagid larvae and spat in varying circumstances. In addition, exterior shell architectures and post‐mortem orientations of shells are inferred to have prompted active geophobic (antigravity), rugophilic (groove‐seeking), and rheophilic (current‐seeking) behavior that enhanced survivorship of the settling larvae.

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