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单词 Orthocone
释义

Orthocone

英语百科

Orthocone

Fossilised Orthoceras orthocones.

An orthocone is an unusually long straight shell of a nautiloid cephalopod. During the 18th and 19th centuries, all shells of this type were named Orthoceras, but it is now known that many groups of nautiloids developed or retained this type of shell.

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