ichthyopterygiaAn order of extinct reptiles; the ichthyosaurs. In Owen's classification of 1860 it is the third order of the class Reptilia, and in that of 1866 the fifteenth order of Hæmatocrya, or cold-blooded vertebrates, having a fish-like body, with a very short neck; limbs adapted for swimming, and with more than 5 many-jointed digits; numerous short, biconcave vertebræ, and no sacrum; the anterior ribs with bifurcate heads; episternum, clavicles, postorbital and supratemporal bones, and parietal foramen present; small maxillaries; long and large premaxillaries; the teeth confined to the maxillary, premaxillary, and premandibular bones, and implanted in a common alveolar groove; large orbits with a circle of sclerotic plates; and two small nostrils. See cuts under Ichthyosauria and Ichthyosaurus.
ichthyopterygia[lowercase] Plural of ichthyopterygium.
Webster's Revised Unabridged Dictionary
NL. See Ichthyopterygium
ICHTHYOPTERYGIA, number of digits in the, ii.
"The Variation of Animals and Plants Under Domestication, Volume II (of 2)" by Charles Darwin