Cryptochiton stelleri (Large stone turtle shell) - Cryptochiton stelleri

Japanese: オオバンヒザラガイ(大判石鼈貝) - オオバンヒザラガイ(英語表記)Cryptochiton stelleri
Cryptochiton stelleri (Large stone turtle shell) - Cryptochiton stelleri
A mollusc of the Chiton class and family Cootidae with no shell visible on its back. The shell is about 20cm long, 10cm wide and 2cm bulge, with the largest species reaching a length of 43cm. The upper part of the back is covered with a rough, velvety mantle, and the butterfly-shaped white shells lined up in front and back are hidden underneath. These shells are sold under the name Kochogai at tourist spots in Hokkaido. The underside has broad yellow-orange feet that attach to rocks and crawl gently. There are many gills in the depressions between the feet and the mantle.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
背上に殻がまったく見えないヒザラガイ綱オオバンヒザラガイ科の軟体動物。殻の長さ20cm,幅10cm,膨らみ2cmくらいで,最大のものでは長さ43cmにも達する大型種。背上はがさがさしたビロード様の外套(がいとう)で覆われて,前後に並ぶ胡蝶(こちよう)形の白い殻はその下に隠れている。この殻を北海道の観光地ではコチョウガイの名で売っている。下面は黄橙色の広い足で,これで岩に付着して緩やかにはう。足と外套の間のくぼみに多くのえらがある。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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