アダムズタマガイの所属について

概要

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When OYAMA revised the Family Naticidae, he doubtfully classified "Natica" adamsiana DUNKER into genus Paratectonatica AZUMA, 1961. This paper deals with the situation of that species which should be included into genus Cryptonatica DALL, 1892, instead of Paratectonatica, because the central tooth of the radula of that species has main cusp with a pair of small lateral cusp. The radula of "Natica" adamsiana DUNKER agrees with Cryptonatica clausa (BRODERIP et SOWERBY) reported by ODHNER, 1913, and Cryptonatica janthostomoides (KURODA et HABE) by AZUMA, 1961, but Paratectonatica tigrina (RODING), the type-species of Paratectonatica, has the central tooth with three subequal cusps. Then "Natica" adamsiana DUNKER belongs to Cryptonatica by lingular character. The lateral and marginal teeth of Cryptonatica and Paratectonatica are rather similar. "Natica" adamsiana has smaller funicle than most Cryptonatica and the last part of umbilicus is not perfectly filled up, though such specimens of Cryptonatica janthostomoides (KURODA et HABE) are rarely available. Then Cryptonatica may contain such forms with imperfectly closed umbilical character as in Paratectonatica and some other Naticidae.
日本貝類学会の論文
1976-10-20