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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Dicathais ： ウィキペディア英語版 Dicathais ''Dicathais'' is a genus of predatory sea snails, marine gastropod molluscs in the family Muricidae, the rock snails. This genus is monotypic; the only species in it is ''Dicathais orbita'', common name the white rock shell or cart-rut shell, found round the coasts of Australia and New Zealand. ==Description== The white rock shell is large with a strong shell usually about long, but occasionally growing to twice this size. It shows great variation in its shell sculpture across its range. In Eastern Australia there are 7 to 9 deeply indented ribs in each whorl with clefts of a similar width between them, sculptured with further fine riblets. This gives a fluted edge to the lip and the grooves can also be seen on the interior surface of the shell. The central column or columella is smooth and the interior of the shell is white. The Western Australian form has a row of well marked nodules rather than ridges and an unindented lip while the Southern Australian form has much less distinct ridges and a nearly smooth lip. At one time it was thought that these different forms were distinct species but it has now been established that the variations in sculpture are a function of different living conditions. Specimens gathered from New South Wales with deep ridges were kept in a still water aquarium for three years during which time the new shell growth was at first shallowly indented and later was smooth.〔 The colour of the shell is generally creamy white or grey, often with a thin yellowish line round the margin of the lip.〔 Juveniles have thinner shells and are often brown. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dicathais」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.