Nedystoma Ogilby, 1898

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 : 469

Nedystoma Ogilby, 1898

( Figs 1–3 , 38D , 46 )

Type species: Hemipimelodus dayi Ramsay & Ogilby, 1886 .

Diagnosis

Mesethmoid median portion very narrow (2, 2> 1); premaxilla wide and moderately long, its length more than three times in width (120, 3> 1); premaxilla lateral and mesial portions of different sizes (121, 0> 1); anterior margin of premaxilla fringed (122, 0> 1); anteroventral portion of opercle subtrapezoidal, very long (127, 1> 0); dorsal crest of hyomandibula short and high (141, 0> 1); second external branchiostegal ray almost as wide as first ray (148, 0> 1); distal portion of third external branchiostegal ray spatulate (149, 0> 1); contact face between first epibranchial and first pharyngobranchial very conspicuous (177, 0> 1).

Ambiguous optimization: Upper (pharyngeal) tooth plate very long and narrow, its length more than four times its width (195,?> 3).

Included species

Nedystoma dayi Ramsay & Ogilby, 1886 .

Habitat and distribution: Predominantly freshwaters, but also in brackish waters, southern New Guinea ( Fig. 38 ).

Remarks See Remarks of Doiichthys .

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 38. Representative skulls, in dorsal view, and distribution of the subtribe Doiichthyina.A, Brustiarius nox, AUM 47488. B, Paracinetodus carinatus, AUM 47550.C, Cochlefelis spatula, AUM 50296. D, Nedystoma dayi, AUM 47500. E, Aceroichthys dioctes, AUM 47507. F, Pachyula crassilabris, AUM 47509. G, Pararius proximus, AUM 47486.H, Potamosilurus velutinus, AUM 47489.* marine, ** brackish waters, *** freshwater.

Figure 46. Nedystoma dayi, New Guinea, photograph by Ricardo Betancur-R., type species of the genus.