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Quantitative Analysis of Ontogenetic Changes of Cell-Reflecting Sculptures in Ostracoda (Crustacea)

Toshiaki Irizuki
Journal of Paleontology
Vol. 68, No. 5 (Sep., 1994), pp. 1067-1073
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/1306177
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Quantitative Analysis of Ontogenetic Changes of Cell-Reflecting Sculptures in Ostracoda (Crustacea)
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Abstract

The distributional patterns of reticulate sculptures, corresponding to those of the underlying epidermal cells, of two Baffinicythere species (Ostracoda, Crustacea) are discussed from a geometrical point of view to understand whether they are under some rule or not. Reticulation geometry has been quantified by applying the method of Dirichlet domains defined as convex polygons, each being demarcated by bisectors normal to the lines connecting neighboring pairs of points. Studies of the distributional patterns of reticulation during growth reveal that these polygons become closer to Dirichlet domains and are dominated by hexagonal or subcircular fossa outlines toward the adult stage, and ultimately reach an equilibrium and stable pattern at maturity.

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