retrochoanitic

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

retrochoanitic (not comparable)

1. (anatomy) That points backward.
   • 2016 January 14, “Paleobiology of the Latest Tithonian (Late Jurassic) Ammonite Salinites grossicostatum Inferred from Internal and External Shell Parameters”, in PLOS ONE‎, →DOI:

     The latter is retrochoanitic during the earliest ontogenetic stages (Fig 4A 2 ) and becomes prochoanitic (Fig 6B ) at D≈1.8 mm, after approximately 18 septa and in the first half of the second whorl (in CPC-1214).

• prochoanitic; for more, see list in orthochoanitic