One of the mysteries of the English language finally explained.
Designating or relating to the anterior ventral region of the carapace in certain decapod crustaceans, flanking the buccal cavity (and sometimes extended into a pair of winglike projections at the anterior edge); (also) designating a spine that is sometimes present on the anterolateral angle of the carapace.
Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From pterygostome + -ial.
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