cyrtocone

English
A oncocerid; its shell is a cyrtocone.

Etymology

cyrto- +‎ cone

Noun

cyrtocone (plural cyrtocones)

  1. (malacology) A curved (cyrtoconic) form of the young shell that succeeds the more primitive orthocone in nautiloid cephalopods.
    Coordinate term: cyrtoceracone
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