Crepidula onyx (Crepidula onyx)

Japanese: シマメノウフネガイ(縞瑪瑙船貝) - シマメノウフネガイ（英語表記）Crepidula onyx

A gastropod of the family Caribogastropodidae. The shell is about 3 cm long, 2.5 cm wide, and 1 cm high. It is a low, flat oval shape, and is coiled at the rear end. The outer surface of the shell is purple-brown and covered with brown skin, while the inner surface is dark purple-brown with a thin white plate at the rear. It attaches to the shells of turban shells, red seaweeds, Japanese mullets, and long-striped shells that live below the intertidal zone to depths of about 20 m, as well as to the shells of mainly gastropod shells containing hermit crabs. It is native to the west coast of North America, but was first discovered in Kanada Bay at the mouth of Tokyo Bay in the summer of 1968, and quickly spread up the Pacific coast to Onahama in the north and Kyushu in the south, eventually settling in Japan.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

カリバガサガイ科の巻貝。殻は長さ3cm，幅2.5cm，高さ1cmくらいになる。低くて平らな楕円形で，巻きは後端による。殻表は紫褐色で褐色の皮をかむり，内面は濃紫褐色で白色の薄い板が後半にある。潮間帯下より水深20mくらいのところにすむサザエ，アカニシ，ボウシュウボラ，ナガニシの殻や，ヤドカリの入った主として巻貝の殻の上に付着する。北アメリカ西岸原産であるが，1968年夏に東京湾口の金田湾で最初に発見され，急速に太平洋岸を北は小名浜，南は九州まで広がり，日本にすみついた。

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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