Sarcopterygian and other Fishes from the Marine Upper Devonian of Colorado, U.S.A.

The fish fauna of Upper Devonian deposits of SW Colorado is described and compared with those of Central Colorado. The osteolepidid Litoptychus is redescribed including skull roof, cheek, palatoquadrate, cleithrum and postcranial elements. A second osteolepidid with cosmine‐covered scales and bones is recognized in the Upper Devonian deposits of Colorado. A skull roof and a parasphenoid formerly attributed to Litoptychus , and a pterygoid, cleithrum, ribs and scales are assigned to dipnoans, partly to long‐snouted dipnoans cf. Soederberghia. Comparison of the Late Devonian fish fauna of Colorado with that of Arizona places the fishes of Colorado into a coastal marine depositional environment.