Proceedings of The Academy of Natural Sciences (Vol. 143, 1991)

Abra de Porculla Academy of Natural adult females adult males anal fin anal fin rays ANSP antehumeral Bahamas Bleeker bocourti Böhlke Borneo Boulenger Boyer Cajamarca Canchaque carrioni caudal Chao Phraya chlorostictus collected color conchophilus dark brown Depto diatoms Dorsal scales Ecuador empetrus eunetopsis fishes FMNH forelimb forest Fowler genus gigas gill arch gill rakers granular gular Helicophagus holotype Huancabamba humeralis hypophthalmus imbricate Internasals ISOTYPE known LECTOTYPE LSUMNS LSUMZ macronema Mekong Monte Seco Museum nasutus Natural History Natural Sciences neck folds NIFI Nongkhai northern Perú Ophryoessoides Pangasiidae Pangasius pangasius paratype pattern pectoral Perú Piura pleurotaenia posteriorly postfemoral pocket posthumeral pocket postparietals praeornatus pterygoid teeth region Río Zaña Sciences of Philadelphia sexual dimorphism simonsi single mount species of Pangasius species of Stenocercus specimen coord Stenocercus imitator Stenocercus percultus stripe strongly keeled subadults supraoculars T. R. Roberts tail type locality Udima USNM ventral scales weakly