What is the meaning of Pectostraca?

(n.pl.) A degenerate order of Crustacea, including the Rhizocephala and Cirripedia.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). Pectostraca. Retrieved September 28, 2026, from http://smartdefine.org/pectostraca/definitions/2042995
ChicagoWebster's. 2011. "Pectostraca" http://smartdefine.org/pectostraca/definitions/2042995 (accessed September 28, 2026).
HarvardWebster's 2011, Pectostraca, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/pectostraca/definitions/2042995>.
MLAWebster's. "Pectostraca" 27 May 2011. Web. 28 September 2026. <http://smartdefine.org/pectostraca/definitions/2042995>