English edit

Etymology edit

ortho- +‎ taxon

Noun edit

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.