proostraca

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A form of proostracum — The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous.

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Meanings

noun
  1. pluralplural of proostracum
Cite this entry
APA

proostraca. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/proostraca

MLA

“proostraca.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/proostraca. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “proostraca,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/proostraca.

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