On the relationships of the Triassic-Liassic redfieldiiform fishes. American Museum novitates ; no. 2795

Abstract

"A survey of character distributions among the extinct lower actinopterygians has corroborated the hypothesis that the freshwater, Triassic-Liassic redfieldiiform fishes form a monophyletic group. This proposal is based mainly on the pattern of the dermal snout, loss of anterior nares, and presumably independent reduction of the branchiostegal series. The sister group of the redfieldiiforms among the other extinct lower actinopterygians remains unknown, but a survey of the dermal skull in these fishes has provided a hypothetical 'sister' pattern"--P. [1].