ammonitella

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noun

The initial part of a spiral shell, originating from a central chamber, in ammonoid molluscs

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Meanings

nounammonitella (plural ammonitellas)

plural ammonitellas

  1. The initial part of a spiral shell, originating from a central chamber, in ammonoid molluscs

    The embryonic stage, consisting of a small ellipsoid protoconch and ammonitella, ends at about 0.6 mm.

    2016 January 14, “Paleobiology of the Latest Tithonian (Late Jurassic) Ammonite Salinites grossicostatum Inferred from Internal and External Shell Parameters”, in PLOS ONE, →DOI
    1 more example

    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.

    2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 61
Cite this entry
APA

ammonitella. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ammonitella

MLA

“ammonitella.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ammonitella. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ammonitella,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ammonitella.

Source: ammonitella on Wiktionary, CC BY-SA 4.0.