heteromorph

An ammonite whose shell is unusual in not being a regular spiral.

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

Any heteromorphic organism.

Mean body length of heteromorphic males from birds with both types of male morphs did not differ significantly from that of heteromorphs from birds that had only heteromorphic males […]