Systematic Positions of Hamineobulla kawamurai Habe, 1950 and Pseudophiline hayashii Habe, 1976 (Opisthobranchia)

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  • 後鰓類スジナツメガイとニヨリキセワタガイの分類学上の位置
  • 後鰓類スジナツメガイとニヨリキセワダガイの分類学上の位置
  • コウサイルイ スジナツメガイ ト ニヨリキセワダガイ ノ ブンルイガクジョウ

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Abstract

Hamineobulla kawamurai Habe, 1950 (Figs. 1-2) had been described based on only a single empty shell collected from Okinawa Main Island, Ryukyu Group, and provisionally placed in the family Bullidae. But, after Kitao's observation on radula of the specimen collected from the shallow sandy bottom off Tomioka, Amakusa, the west coast of Kyushu, it was shown that this species has no central tooth and one horn-shaped lateral tooth on each side, suggesting a close relationship with Cylichnatys angusta (Gould) of the Family Atyidae, which has one central tooth and one horn-shaped lateral tooth on each side. Therefore, Hamineobulla kawamurai Habe may be transferred from the family Bullidae to the family Atyidae. According to the original description of Pseudophiline hayashii Habe, 1976 (Figs. 3-5), this species has neither radula nor stomachal plates. But, Kitao has found the vestigial radular teeth in the buccal cavity. The radula has no central tooth, a single large lateral tooth, and two small marginal teeth on each side like in the genus Philine Ascanius, which has only a large lateral tooth on each side. Therefore, Pseudophiline hayashii Habe may be transferred from the family Aglajidae, which has neither radula nor stomachal plates, to the family Philinidae.

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