Ichthyopterygia n. pl. : See Ichthyosauria.

Example:


Taxonomy
Ichthyopterygia, Motani, free encyclopedia, ichthyosaurs, Superorder, flippers, Jurassic Ichthyosaurs, primitive, middle Triassic, movements, animals, Family, Order Ichthyosauria, Sir Richard Owen, search, Fossil range, Kingdom, Phylum.

Defination from the web:
Ichthyopterygia ("fish flippers") was a designation introduced by Sir Richard Owen in 1840 to designate the Jurassic Ichthyosaurs that were known ... ( 2003) Ichthyopterygia, Handbook of Paleoherpetology, Part 8, Verlag Dr. Friedrich Pfeil ...