ammonitella

See also: Ammonitella

English

Etymology

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Noun

ammonitella (plural ammonitellas)

1. 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], →DOI:

     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.