A marine animal belonging to the family Pectinidae, class Asteroidea, phylum Echinodermata. It is a thick, pentagonal, spool-shaped starfish with irregular cloud-like red spots scattered across a blue-blue background, but some are tinged with blue-green or are almost entirely red-orange. The underside is uniformly yellow-orange. It has the habit of inflating its stomach and pushing it out of its mouth, crawling around rocks and aquaculture rafts to feed on fish and shellfish. It is commonly seen on the coasts of various places from Hokkaido to Kyushu, and is also found in Sakhalin, the Korean Peninsula, and the coasts of northern China. Similar species include the small Pectinidae, the Togeitoman, and the Nunomate Pectinidae, all of which are small species with diameters of 2 to 3 centimeters or less. [Michio Shigei] © Underwater Fort Enterprise Isamu Soyama "> Starfish (ecology) Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
棘皮(きょくひ)動物門ヒトデ綱イトマキヒトデ科に属する海産動物。五角形の分厚い糸巻形をしたヒトデで、青藍(せいらん)色の地に不規則な雲紋(うんもん)状の赤色斑(はん)が散在するものが多いが、青緑色を帯びたものや、全体がほとんど赤橙(せきとう)色1色のものもある。裏側は一様に黄橙色。胃を膨らませて口から外へ押し出し、岩の上や養殖筏(いかだ)の周りをはい回って魚貝類を食害する習性がある。北海道から九州まで各地の磯(いそ)でごく普通にみられ、樺太(からふと)(サハリン)、朝鮮半島、中国北部沿岸にも分布する。近似種として、チビイトマキ、トゲイトマキ、ヌノメイトマキヒトデなどがあるが、いずれも直径2~3センチメートル以下の小形種である。 [重井陸夫] ©水中フォート・エンタープライズ 楚山いさむ"> イトマキヒトデ(生態) 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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