Spirifer (English spelling)

Japanese: スピリファー（英語表記）Spirifer

A representative genus of the order Spirifera in the phylum Brachiopoda, it is widely known throughout the Carboniferous. It is an articulated animal characterized by having spiral arm bones on both sides of the inside of its dorsal shell. The shell is highly variable, but is usually long horizontally with long hinge lines, and many resemble a swallow with its wings spread, hence the Chinese name Shiyan. A fossil animal that lived from the Silurian to Permian periods and peaked in the Devonian period.

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

Japanese:

腕足動物門のスピリファー目の代表属で，世界の石炭系中に広く知られている。有関節類で背殻の内部両側に螺旋形の腕骨をもつことが特徴。殻は変化に富むが，普通横に長く，ちょうつがい線は長く，ツバメが翼を広げた姿に似たものが多いので，石燕の中国名がある。シルル紀からペルム紀に生存，デボン紀に最盛した化石動物。

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