A marine animal belonging to the phylum Echinodermata, class Asteroidea, family Acanthidae. A large, beautiful blue starfish found on coral reefs. Colors range from bright blue to gray-blue, turquoise, yellow-green, or even dirty green. It usually has five arms, but it is not uncommon to see four or six. The arms are stiff and rounded, slightly tapered at the base, and covered with granules. They can reach an arm length of 20 centimeters. They are commonly found in coral reef areas in the tropical waters of the western Pacific and Indian Oceans south of the Amami and Okinawa Islands, but are occasionally found off the southern tip of the Kii Peninsula, the southwestern tip of Shikoku, and southwestern Kyushu. [Michio Shigei] [Reference] |© Underwater Fort Enterprise Isamu Soyama "> Blue starfish (ecology) Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
棘皮(きょくひ)動物門ヒトデ綱ホウキボシ科に属する海産動物。サンゴ礁に産する美しい青色の大形ヒトデ。色は鮮やかな青色のものから、灰青色、青緑色、黄緑色、あるいは汚緑色のものまである。腕の数は普通5本であるが、4本あるいは6本のものもまれではない。腕は硬く、丸みを帯びていて、根元のほうがややくびれ、表面は顆粒(かりゅう)で覆われている。腕長20センチメートルに達する。奄美(あまみ)、沖縄諸島以南の西太平洋およびインド洋の熱帯海域のサンゴ礁域に普通に産し、紀伊半島南端、四国南西端、九州南西部からもまれに知られる。 [重井陸夫] [参照項目] |©水中フォート・エンタープライズ 楚山いさむ"> アオヒトデ(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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