天草産一新種ミアミラウミウシ

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概要

• 論文の詳細を見る

• Miamira flavicostata n. sp. The general shape of the animal is similar to a Ceratosoma. Total length of body 8cm. Mantle-margin wavy, forming 4 prominent lobes on either side. At the foremost end the mantle is more or less expanded with about 7 lobules. Down the middle of the back runs an obscure ridge which bears 5 tubercles, the largest of them being situated in front of the branchial cavity. Transverse ridges extend from all the tubercles (excepting the first) and each terminates in a lateral lobe. Branchial plumes 7 in number, all simply pinnate. Tail elongated considerably beyond the posterior end of the mantle. Oral tentacles small, conical. Foot angulated at the antero-lateral corners. A series of thin lamellae on the underside of the lateral lobes. The main part of the back surface reddish purple, turning to greenish towards the sinuous margins of the mantle. A narrow band of chrome yellow on the mid-dorsal ridge, similar but transverse bands along the ridges from the tubercles to the lateral lobes. Also there are a number of chrome yellow markings on the margin of the head veil and in the areas defined by the longitudinal and transverse bands. Sides of body reddish purple, covered everywhere with chrome yellow markings. Both the rhinophores and the branchial plumes orange coloured. Elements of the labial armature non-bifid hooks. Radula formula 100×150-170.0.150-170. All the lateral teeth simply hamate, with no denticulations. Loc.: Tomioka, Amakusa (Ar. 1939; 1 sp.). Two species are known of the genus Miamira: sinuata (van Hasselt)=nobilis Bergh, and magnifica Eliot. The former ranges widely in the Indian Ocean and the southern Pacific, and is greenish blue with yellow spotson the surface. The latter, known from Seychelles, is whitish, covered with green and purple reticulations. These two species cannot be identified with flavicostata since they have more or less different configuration of the back surface.

• 社団法人日本動物学会の論文
• 1940-06-15

著者

• 馬場 菊太郎

  天草臨海實驗所

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