ostracoid

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• ostracoid — os tra*coid, a. (Zo[ o]l.) Of or pertaining to the {Ostracoidea} (now {Ostracoda}). n. One of the {Ostracoidea} (now {Ostracoda}). [1913 Webster +PJC] …   The Collaborative International Dictionary of English

• Thoracostraca — Tho ra*cos tra*ca, n. pl. [NL. See {Thorax}, and {Ostracoid}, a.] (Zo[ o]l.) An extensive division of Crustacea, having a dorsal shield or carapec? ??niting all, or nearly all, of the thoracic somites to the head. It includes the crabs, lobsters …   The Collaborative International Dictionary of English