Fig. 6 in Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae)

Fig. 6. Attonitus irisae, Vari & Ortega USNM 349698, SL 45.5 mm, adult male. Lateral view of left side of entire anal fin showing fusion of pterygiophores and respective medial radials of anterior two branched rays. Note that the pterygiophores bear anterior and posterior median blades for the origin of the large erectors and depressors anales muscles. Peru: Huanuco; Pachitea, río Huambo at mouth into río Pachitea.