coelacanth

Japanese: シーラカンス
coelacanth
〘Noun〙 (coelacanth) A general term for a lineage of fish belonging to the order Coelacanthi of the subclass of bony fishes, the order Coelacanthi. This fish flourished in the seas from the Devonian period of the Paleozoic to the Cretaceous period of the Mesozoic. It was once known only as a fossil, but in 1938, a living one was caught for the first time off the coast of Madagascar, and since then, several hundred have been caught. It can reach a body length of 1.9 meters and a weight of 90 kilograms. Its body color is dark blue with white spots. Its body is long and laterally compressed. Primitive structures can be seen in each part of its body, making it a valuable fish in zoology as a "living fossil." Its spine is tubular, and the name "coelacanth" comes from this characteristic. Its fins have stalks, and the pectoral and pelvic fins are particularly large. Its scales have a unique structure called cosmin scales, and are made up of three layers. It is found only around the Comoro Islands in the tropical western Indian Ocean. They live in rocky areas at depths of 150 to 400 meters and feed on fish. Their population is very small and they are at risk of extinction.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 (coelacanth) 硬骨魚類総鰭亜綱シーラカンス目に属する魚類の一系統の総称。古生代デボン紀から中生代白亜紀までの海に栄えた魚で、かつては化石としてだけ知られていたが、一九三八年にマダガスカル島近海で初めて生きているものが一尾捕獲され、その後現在までに数百尾が漁獲されている。体長一・九メートル、体重九〇キログラムに達する。体色は暗青色で白斑がある。体は長く、側扁する。体の各部に原始的な構造が見られ、「生きた化石」として動物学上貴重な魚とされている。脊柱が管状で、「シーラカンス」の名もこの特徴による。ひれには柄部があり、特に胸びれと腹びれが大きい。鱗はコスミン鱗と称する特異な構造で三層からなっている。西インド洋熱帯域にあるコモロ諸島周辺にだけ分布している。水深一五〇~四〇〇メートルの岩礁域に生活し、魚類などを食べている。生息数は大変少なく、絶滅の危険がある。

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