Defn: See Ichthyosauria.
ICHTHYOPTERYGIUM
Ich`thy*op`te*ryg"i*um, n. Etym: [NL., fr. Gr. (Anat.)
Defn: The typical limb, or lateral fin, of fishes.
ICHTHYORNIS
Ich`thy*or"nis, n. Etym: [NL., fr. Gr. (Paleon.)
Defn: An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebræ, and sharp, conical teeth set in sockets. Its wings were well developed. It is the type of the order Odontotormæ.
ICHTHYOSAUR
Ich"thy*o*saur, n. Etym: [Cf. F. ichthyosaure.] (Paleon.)
Defn: One of the Ichthyosaura.
ICHTHYOSAURIA
Ich`thy*o*sau"ri*a, n. pl. Etym: [NL. See Ichthyosaurus.] (Paleon.)
Defn: An extinct order of marine reptiles, including Ichthyosaurus and allied forms; — called also Ichthyopterygia. They have not been found later than the Cretaceous period.
ICHTHYOSAURIAN
Ich`thy*o*sau"ri*an, a. (Paleon.)