What is the meaning of Atrypa?

(n.) A extinct genus of Branchiopoda, very common in Silurian limestones.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). atrypa. Retrieved September 23, 2026, from http://smartdefine.org/atrypa/definitions/1976883
ChicagoWebster's. 2011. "atrypa" http://smartdefine.org/atrypa/definitions/1976883 (accessed September 23, 2026).
HarvardWebster's 2011, atrypa, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/atrypa/definitions/1976883>.
MLAWebster's. "atrypa" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/atrypa/definitions/1976883>