pterygia's Usage Examples:

"Although not strictly forming part of the skull, allusion should be made here to the ring of sclerotic plates which has been found in many of the Stegocephalia, and which is only found elsewhere in a few Crossopterygian fishes as well as in many reptiles and birds.

For cataracts, pinguecula, pterygia, headaches and wrinkling, the best advice is to avoid chronic or overexposure to UV rays or to wear the appropriate protection when under these conditions.

Although not strictly forming part of the skull, allusion should be made here to the ring of sclerotic plates which has been found in many of the Stegocephalia, and which is only found elsewhere in a few Crossopterygian fishes as well as in many reptiles and birds.

Pinguecula and pterygia can occur much earlier, even in individuals 18 and over, again depending on the degree and chronicity of unprotected exposure to UV rays.

- Tailed, lacertiform or serpentiform batrachians, with the temporal region of the skull roofed over by postorbital, squamosal, and supratemporal plates similar to the same bones in Crossopterygian fishes, and likewise with paired dermal bones (occipitals and post-temporals) behind the parietals and supratemporals.

The extinct Stegocephalia, on the other hand, were mostly protected, on the ventral surface at least, by an armour of overlapping round, oval, or rhomboidal scales, often very similar to those of Crossopterygian or ganoid fishes, and likewise disposed in transverse oblique lines converging forwards on the middle line of the belly.

, in the artificially-conceived order of Malacopterygians, or soft-finned bony fishes.

Orders: Anomodontia, Chelonia, Samopterygia, Ichthyopterygia, Rhyncocephalia, Dinosauria, Crocodilia, Ornithosauria, Squamata.

These fins contain numerous (15-17) rays, a feature in which the fish differs from the Acanthopterygians.