Author: Steindachner, 1876
Remark: There is confusion in the literature regarding the identity of this species; Steindachner (1876) noted that it might be <i>P. laeta</i> (Cope, 1871).   However <i>P. semifasciata</i> has a distinctive narrow black stripe extending across the head and onto the body almost to the dorsal fin, whereas on what remains of the type of <i>P. laeta</i> the black stripe ends just behind the head.  Marilyn Weitzman, pers. comm., Eschmeyer, 1998:1535; Ortega and Vari, 1986:11.