Inpaichthys Géry & Junk, 1977

Ferreira, Katiane M., Ribeiro, Alexandre C., Lima, Flávio C. T., Silva, Hugmar P. da, Ferreira, Daniela C. & Mirande, Juan Marcos, 2024, A new species of Inpaichthys from the rio Canamã, rio Aripuanã basin, Mato Grosso State, Brazil, with a redefinition of the genus (Characidae: Stethaprioninae), Neotropical Ichthyology (e 230113) 22 (1), pp. 1-20 : 5

Inpaichthys Géry & Junk, 1977

Type-species. Inpaichthys kerri Géry & Junk, 1977

Diagnosis. We found eight morphological non-exclusive synapomorphies supporting the monophyly of Inpaichthys that, in combination, could be useful to diagnose the genus: nasal septum of mesethmoid formed by two parallel lamellae (9:1), absence of a dorsal expansion of rhinosphenoid projected medial to olfactory nerves (35:0), short supraoccipital spine covering dorsally only anterior axis of neural complex of Weberian apparatus (62:1), articulation between second and third infraorbitals anteroventrally angled (86:1), absence of anguloarticular portion of mandibular laterosensory canal (105:1), frontal and pterotic laterosensory canals forming an angle on pore receiving infraorbital canal (118:1), maxillary teeth extended approximately to half maxillary length (191:0), and presence of 24 or fewer branched anal-fin rays, with a reversal to 21–25 in the new species herein described (420:0). Species of Inpaichthys can also be recognized by the combination of the following characters: two or more maxillary teeth with larger one, tri or pentacuspidate, ten or fewer gill rakers on first hypobranchial and ceratobranchial, interrupted lateral line, lack of parietal branch of supraorbital cephalic laterosensory canal, pore of the supraorbital cephalic laterosensory canal situated just anterior to dilatator fossa oriented dorsomedially (Mirande, 2018: S11, figure 11), circuli absent on posterior field of scales, iii+9 dorsal-fin rays with the anterior one visible only in c&s specimens, lack of secondary-sexual hooks on males, and lack of pseudotympanum.