Some Effects of Introduced Fishes on the Native Fish Fauna of Southern Nevada

Abstract

(Gregory 1933, Fig. 283). Development of the upper jaw in the Iniomi is similar initially to that in the Isospondyli, but while still in the larval stage the premaxillaries continue to grow posteriad and force the maxillaries completely out of the gape. The presence of transitory teeth on the maxillaries in larval Scopelosaurus may be indicative of a close phylogenetic association of this family with the Isospondyli. Representatives of other, higher orders of fishes studied develop the upper jaw structure in a manner similar to that in the Iniomi. This indicates that fishes in most of the