Rock Barnacle - Rock Barnacle

Japanese: イワフジツボ - いわふじつぼ
Rock Barnacle - Rock Barnacle

A marine animal belonging to the order Acanthariidae of the class Crustacea and the order Complete Thorax of the phylum Arthropoda. It grows in colonies on rocks near the high tide line of reefs facing the open ocean, or on the tops of large rocks in the mid- and low-tide zones. It is a barnacle with a shell diameter of less than 8 mm, and can withstand long periods of exposure. When there are few individuals, it is conical in shape with clear longitudinal ribs, but when it is dense, it becomes closer to cylindrical. It is distributed from southwestern Hokkaido to Tanegashima in Kagoshima Prefecture, but in places with rough waves, the closely related and slightly larger species Ch. pilsbryi can also be found. Ch. malayensis , the southern rock barnacle, is also found south of the Tokara Islands.

[Masamichi Takeda]

Rock Barnacle (Ecology)
The shell diameter is 8mm or less and is conical, but when they are crowded together they become closer to a cylinder. They can withstand long periods of exposure. © Underwater Fort Enterprise, Isamu Soyama ">

Rock Barnacle (Ecology)

Black Barnacles and Rock Barnacles (Ecology)
A small rock barnacle is attached to the shell of a large black barnacle. © Underwater Fort Enterprise, Isamu Soyama ">

Black Barnacles and Rock Barnacles (Ecology)


Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

節足動物門甲殻綱完胸目イワフジツボ科に属する海産動物。外洋に面した岩礁の高潮線付近の岩、あるいは中・低潮帯にある大きな岩石の上部に群生する。殻径8ミリメートル以下のフジツボで、長時間の露出によく耐える。個体数が少ないと円錐(えんすい)形で縦肋(じゅうろく)がはっきりしているが、密集すると円筒形に近くなる。北海道南西部から鹿児島県種子島(たねがしま)まで分布するが、波が荒い場所には近縁種でやや大形のオオイワフジツボCh. pilsbryiもみられる。また、吐噶喇(とから)列島以南にはミナミイワフジツボCh. malayensisが分布する。

[武田正倫]

イワフジツボ(生態)
殻径8mm以下の円錐形だが、密集すると円筒形に近くなる。長時間の露出によく耐える©水中フォート・エンタープライズ 楚山いさむ">

イワフジツボ(生態)

クロフジツボとイワフジツボ(生態)
大形のクロフジツボの殻板に小形のイワフジツボが固着しているようす©水中フォート・エンタープライズ 楚山いさむ">

クロフジツボとイワフジツボ(生態)


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