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Geometric regularity of some oblique sculptures in pectinid and other bivalves: recognition by computer simulations

Published online by Cambridge University Press:  08 April 2016

Itaru Hayami  and
Takashi Okamoto
Itaru Hayami
Affiliation:
Geological Institute, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan
Takashi Okamoto
Affiliation:
Geological Institute, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan
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Abstract

The geometric regularity of oblique sculptures in pectinids and some other bivalves was examined both theoretically and empirically. Camptonectes microsculpture occurs exclusively on the external surface of foliated calcite, and is well characterized by an invariably orthogonal relation to growth increments and almost uniform density over the surface. It is genetically unrelated to radial and other sculpturing. According to our SEM observations, its divergent orientation seems to be controlled primarily by the growth of calcite laths. In contrast, the shagreen microsculpture of pectinids is characterized by a quincunx arrangement of scales on the diagonal network. Shagreen microsculpture can be regarded as a variant of diagonal sculpture together with the simple oblique, divaricate, V-shaped, and zigzag patterns that are widespread in other bivalves. The geometric regularity of these variations as well as their mutual relationship can be readily recognized by computer simulations. All of these diagonal sculptures may result from interference between radial and commarginal elements. The formation of diagonal sculptures seems to occur by the periodic activation of regularly arranged sculpture-producing cells on the mantle margin.

Type
Articles
Information
Paleobiology , Volume 12 , Issue 4 , Fall 1986 , pp. 433 - 449
Copyright
Copyright © The Paleontological Society 

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