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Quantitative analysis of ontogenetic changes of cell-reflecting sculptures in Ostracoda (Crustacea)

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.