Chinchaysuyoa Marceniuk et al. 2019

Marceniuk, Alexandre Pires, Oliveira, Claudio & Ferraris Jr, Carl J., 2024, A new classification of the family Ariidae (Osteichthyes: Ostariophysi: Siluriformes) based on combined analyses of morphological and molecular data, Zoological Journal of the Linnean Society 200 (2), pp. 426-476 : 440-442

Chinchaysuyoa Marceniuk et al. 2019

( Figs 1–3 , 12A – 13 )

Type species: Arius labiatus Boulenger, 1898 .

Diagnosis

Mesethmoid posterior horn tubular, narrow, and elongate (5, 0> 1); bony bridge formed by lateral ethmoid and frontal cylindrical and thin (16, 0> 1); vomer anterior margin very pronounced and acute (50, 0> 1); accessory tooth plates small, transversely elongate, and narrow (60, 2> 0); optic foramen very reduced (67, 1> 2); anterior opening of aortic canal at base of subvertebral process and anteroventrally oriented (77, 0> 1); posterior process of exoccipital connected to Müllerian ramus by suture (93, 0> 1); one-half or less of interopercle posterior part contacting ventral margin of opercle (131, 1> 0); anterior portion of interopercle compressed and bifurcate (132, 0> 1); interopercle anterior portion conspicuously narrow (133, 0> 1); metapterygoid one and a one-half times longer than deep in perpendicular section (135, 1> 2); uncinate process of third epibranchial much longer and wider than mesial portion of third epibranchial delimited by uncinate process (182, 0> 1); posterior process of cleithrum very long (224, 1> 2); gas bladder with three chambers (238, 0> 2).

Included species

Chinchaysuyoa ortegai Marceniuk, Marchena, Oliveira & Betancur-R., 2019

Chinchaysuyoa labiata (Boulenger, 1898) *.

442 • Marceniuk et al.

Habitat and distribution: Freshwater, western South America in Ecuador and Peru ( Fig. 12 ).

Remarks

The total-evidence analysis corroborates the monophyly, relationships, and species composition of Chinchaysuyoa , as proposed by Marceniuk et al. (2019b).

Figures

Figure 1. MP analysis.Subfamilies (SF) Galeichthyinae (pink), Bagreinae (bright blue), and Ariinae (dark blue). Tribe (T) Ariini (blue), Cathopsini (orange), Genidentini tribe nov. (brown), and Sciadeini tribe nov. (light green).Subtribe (ST) Ariina (light blue) and Doiichthyina (green). Incertae sedis taxa (IS) (red). Numbers over branches correspond to the bootstrap support.

Figure 2. ML analysis. Subfamilies (SF) Galeichthyinae (pink), Bagreinae (bright blue), and Ariinae (dark blue). Tribe (T) Ariini (blue), Cathopsini (orange), Genidentini tribe nov. (brown), and Sciadeini tribe nov. (light green). Subtribe (ST) Ariina (light blue) and Doiichthyina (green). Incertae sedis taxa (IS) (red). Numbers over branches correspond to the bootstrap support.

Figure 3. BI analysis.Subfamilies (SF) Galeichthyinae (pink), Bagreinae (bright blue), and Ariinae (dark blue). Tribe (T) Ariini (blue), Cathopsini (orange), Genidentini tribe nov. (brown), and Sciadeini tribe nov. (light green).Subtribe (ST) Ariina (light blue) and Doiichthyina (green). Incertae sedis taxa (IS) (red). Numbers over branches correspond to the bootstrap support.

Figure 12. Representative skulls, in dorsal view, and distribution of Genidentini tribe nov. A, Chinchaysuyoa ortegai, MPEG 35976. B, Genidens genidens, MZUSP 51694. C, Paragenidens grandoculis, CIUFES 3763.* marine, ** brackish waters, *** freshwater.

Figure 13. Chinchaysuyoa labiata, MZUT 1540, western Ecuador Guayas River Basin, type species of the genus.