Paracinetodus, Marceniuk & Oliveira & Ferraris Jr, 2024

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 : 471-472

Paracinetodus gen. nov.

( Figs 1–3 , 38B , 50 )

ZooBank registration: urn:lsid:zoobank.org:act:01D775F1-CA33-42B6-AE05-AC1D3E9DBE6C .

Type species: Arius carinatus Weber, 1913 .

Diagnosis

Lateral horn of lateral ethmoid compressed and spatulate (11, 0> 1); extrascapular subtriangular (37, 1> 2); epioccipital contacting small narrow area of diagonal crest associated with neural spine of fourth vertebra (44, 2> 0); ventral tip of subvertebral process acute (80, 0> 2); basioccipital lateral process absent with anterior and posterior portions equally developed (83, 1> 0); transcapular process at right angle to body axis (86, 0> 1); transcapular process short and thick (87, 0> 2); space between transcapular process and otic capsule small (89, 1> 2); premaxilla narrow and long, length two to three times its width (120, 1> 2); bony blade connecting posterolateral processes of urohyal absent (159, 0> 1); posterolateral processes of urohyal two-thirds as long as distal portion of bone (162, 0> 2); transverse crest associated with neural spine of fourth vertebra high (200, 0> 1); median crest associated with neural spine of fourth vertebra high (202, 0> 1); Müllerian ramus bony blade evident in more than one-half length (206, 0> 2); ventral surfaces of parapophyses of fifth and sixth vertebrae conspicuously concave (212, 0> 1); seventh vertebra free from ventral superficial ossification (214, 0> 1); posterior process of cleithrum very long (224, 1> 2); second dorsal cleithral process dorsally directed and parallel to first dorsal process (226, 0> 1).

Etymology

Derived from the Greek ‘para’ for ‘near’, highlighting its morphological similarity with the genus Cinetodus . Gender: masculine.

Included species

Paracinetodus carinatus Weber, 1913 .

Habitat and distribution: Freshwater,southern New Guinea ( Fig.38 ). Remarks

Arius carinatus was included in Cinetodus in previous morphological studies ( Kailola 2004, Marceniuk and Menezes 2007, Marceniuk et al. 2012). The results of the total-evidence analysis place the species in a lineage distinct from that of Cinetodus , corroborating a previous molecular result (Betancur-R. 2009), and requiring the establishment of the new genus.

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 50. Paracinetodus carinatus, photograph by Ricardo Betancur-R., Papua New Guinea and northern Australia, type species of the genus.