ammonitella
See also: Ammonitella
English edit
Etymology edit
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
Noun edit
ammonitella (plural ammonitellas)
- The initial part of a spiral shell, originating from a central chamber, in ammonoid molluscs
- 2016 January 14, “Paleobiology of the Latest Tithonian (Late Jurassic) Ammonite Salinites grossicostatum Inferred from Internal and External Shell Parameters”, in PLOS ONE[1], :
- The embryonic stage, consisting of a small ellipsoid protoconch and ammonitella, ends at about 0.6 mm.
- 2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 61:
- Sure, ammonoid shells as a whole got progressively more coiled over the Devonian. But so did the tiniest part of each ammonoid shell, the ammonitella.