pterygostomial
/ˌtɛrɪɡəˈstəʊmɪəl/Zoology
adjective
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.
Origin
Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From pterygostome + -ial.