European barnacle (English name) Amphibalanus improvisus

Japanese: ヨーロッパフジツボ（英語表記）Amphibalanus improvisus

A member of the order Sessile, class Gnathopoda, family Barnacleidae. Its shell is white, and is about 1 cm in diameter and height. It lives in inland bays, sometimes even invading brackish waters. It is widely distributed in Europe, but was carried to the Americas on the bottom of a ship during World War I, and spread to the Atlantic coast, and then to the Pacific coast during World War II. In Japan, it was discovered in Ise Bay in the 1950s, and has since spread to the Seto Inland Sea, Kanto region, and the Sea of Japan. The closely related American barnacle A. eburneus is a beautiful white color with a shell diameter and height of about 2 cm. It was discovered in Japan in 1966 on Sado Island. It has since been widely distributed along the coast of the Sea of Japan from Yamagata Prefecture south to Hakata Bay, and has also been confirmed in oyster farms in Hiroshima Bay. (→ Gnathopoda, Crustacea, Arthropods, Barnacles)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

顎脚綱無柄目フジツボ科。殻は白色で，殻径，殻高とも 1cm内外。内湾に生息し，ときに汽水域にまで侵入する。ヨーロッパに広く分布しているが，第1次世界大戦中船底についてアメリカ大陸に運ばれて大西洋岸に，その後第2次世界大戦中には太平洋岸にも分布を広げた。日本では 1950年代に伊勢湾で発見され，その後瀬戸内海，関東地方，日本海へと広がっている。近縁のアメリカフジツボ A. eburneus は殻径，殻高とも 2cm内外で，美しい白色。日本では 1966年に佐渡島で発見された。その後，山形県以南博多湾までの日本海沿岸に広く分布し，さらに広島湾のカキ養殖場でも確認されている。（→顎脚類，甲殻類，節足動物，フジツボ類）

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