orthotaxon

English

Etymology

From ortho- +‎ taxon.

Noun

orthotaxon (plural orthotaxa)

1. (taxonomy) A true taxon that is based on biological relationships rather than on form.
   • 2013, M. R. Clarke, Paleontology and Neontology of Cephalopods, page 139:

     Some hook types do not correspond with a particular specific orthotaxon and occur in more than one.