Kalops diophrys

Kalops diophrys is distinguished from its larger sister species, Kalops monophrys, by fewer caudal fin rays, a different number of supraorbital bone rows, and the development of its ganoine ridging at a smaller size. The cranial osteology most closely resembles that of the poorly known Palaeoniscus and "Elonichthys" serratus. The snout structure is closest to the Tarrasiiformes.

For a study of the relationships of these fish, see a relatively recent cladistic character matrix of the lower Actinopterygii.

References:

• Poplin, C., & R. Lund. 2002. "Two Carbooniferous fine-eyed paleoniscoids (Pisces, Actinopterygii) from Bear Gulch (USA)." Journal of Paleontology 76: 1014-1028.

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