heteromorph

English

Etymology

From hetero- +‎ -morph, see heteromorphic.

Noun

heteromorph (plural heteromorphs)

1. (zoology) An ammonite whose shell is unusual in not being a regular spiral.
   • 1971, Oleg Stepanovich Vi︠a︡lov, Fossil Ostracoda, page 15:

     The histial ridge of the heteromorphs is comparatively wide, especially in the anteroventral part, and forms a wide, open cavity —the histial dolon.

Anagrams

• thermophore