化石ナミジワシラスナガイ Crenulilimopsis oblonga (A. Adams) の相対成長

概要

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A biometrical study was made on a fossil population of Crenulilimopsis oblonga (A. Adams) collected from the Takanabe Member of the Miyazaki Group at Kawaminami to clarify the growth pattern. The fossil assemblage at that locality is thought to be autochthonous on the basis of the occurrence of fossils. The feature of sediment-fossil association at the locality is harmonious with the known substrate preference of living elements of the fossil assemblage. The fossil population structure of Crenulilimposis oblonga (A. Adams) was examined by bivariate analysis. The measured parameters are shell length (L), height (H), length of anterior part (A) and length of posterior part (P). The analysis resumed the following simple allometrical equations : L=0.93H^<1.12> and P=1.04A^<1.15> It is clear that the growth rate of L and P are respectively much larger than H and A. In other words, Crenulilimopsis oblonga (A. Adams) shows a positive allometry, therefore, the form of this species does not change abruptly at some growth stage, but gradually changes from orbicular to ovoid throughout growth stage.
日本貝類学会の論文
1982-10-31