The Protoconch of Two Scaphopod Species from Japan

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  • 日本産掘足類2種の原殼

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Juvenile specimens of two scaphopod species with the protoconch intact were collected from Wakayama Prefecture, Japan. One has a hexagonal cross-section with six longitudinal keels and is identified as Dentalium octangulatum; the other is of an unidentified species. Dentalium octangulatum differs from other known species in having a smaller protoconch A and an extremely long protoconch B. The protoconch of the unidentified species matches the type 1 protoconch of Dentaliida. The differences in protoconch morphology may reflect those in larval ecology, but this hypothesis should be tested by developmental studies.

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