901. PARAMETERS FOR DESCRIPTION OF THE SHELL FORM OF THE GENUS ANADARA (MOLLUSCA; BIVALVIA)

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  • 901. Anadara 属の殻形態記述のための計数
  • Anadara属の殻形態記述のための計数〔英文〕
  • Anadaraゾク ノ カクケイタイ キジュツ ノ タメ ノ ケイスウ エイブ

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Abstract

Ontogenetic change in morphological features of Anadara shells is analyzed on the relationship between 4 proportions of portions of shell and shell size. These relational changes are interpreted in the framework of the shell coiling model; ontogenetic change in the shape of cardinal area and teeth arrangement represents a change in revolution around the coiling axis, whereas ontogenetic change in the proportion of the anterior and posterior toothed hinge lengths represents a change in the shape of the commissure. The taxonomic criteria of the genus Anadara are proposed based on similarities of the ontogenetic change in shell shape. The extremely variable population of Anadara ninohensis in the Kubota Formation (Middle Miocene, Fukushima Prefecture) has previously been classified into three species. Analysis of the ontogenetic variation shows that all Kubota specimens fall into the single variable species Anadara (Anadara) hataii Noda, and the other population from the Kadonosawa Formation (lower Middle Miocene, Iwate Prefecture) is placed in the subgenus Scapharca.

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