One of the mysteries of the English language finally explained.
In certain decapod crustaceans: either of a pair of winglike projections of the anterior edge of the ventral carapace, flanking the buccal cavity; this region of the carapace.
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From pterygo- + -stome.
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