Psalidodon erythropterus ( Holmberg, 1891 )

Serra, Wilson S., Scarabino, Fabrizio, Furtado, Giovanni, Sanguinetti, Germán & Caligari, Mauricio, 2021, Fighting faunistic chaos: confirmations and new records for Uruguayan Characidae (Ostariophysi: Characiformes)., Ichthyological Contributions of PecesCriollos 77, pp. 1-9 : 3-4

Psalidodon erythropterus ( Holmberg, 1891)

fig. 4

Examined material: Uruguay: Colonia: MHNM 3922 , 2 ex, 64.2-74.3 mm SL, Nueva Palmira, aprox. 33°52'S 58°25'W, col. CARU-CARP, 5/ VI /2016. San José: MHNM 3501 , 1 ex., 63.7 mm SL, mouth of Arroyo Mauricio, 34°42'28"S 56°41'42"W, col. W.S. Serra, 28/III/2014 . Soriano: MHNM 3909 , 2 ex. 67.5- 73.3 mm SL, Uruguay River between La Concordia and La Agraciada , col. CARU-CARP, 3/ VI /2016.

This species differs from other congeners from the La Plata River and Patos-Merin Lagoon basins by the following combination of characters: 11-13 transverse scale rows above lateral line, 49-54 perforated scales in the lateral series and one maxillary tooth with 5 or 7 cusps ( Soneira et al. 2010).

The analyzed specimens present all these characters and come from southwestern Uruguay, associated to the La Plata and Uruguay rivers ( fig. 7 ). The previously known distribution of P. erythropterus extended through Paraguay, lower Paraná and La Plata River basins in Argentina and Paraguay ( Holmberg 1891; Soneira et al. 2010; Insaurralde et al. 2012).

Psalidodon erythropterus was first mentioned (as Astyanax erythropterus ) and illustrated for Uruguay River area in a technical report published by the Comisión Administradora del Río de la Plata and the Comisión Administradora del Río Uruguay ( CARP-CARU 2016 ), where the authors comment that the species “has yet to be formally recorded as part of the Uruguayan fauna”. Specimens mentioned in that report ( MHNM 3909 and MHNM 3922 ) are incorporated as part of the present work. Moreover , another report ( López-Rodríguez et al. 2019) lists one specimen from Uruguay River in Río Negro Department, collected in autumn 2019, but lacking any other data. Our examination of the specimens mentioned in the first report plus one specimen from San José Department, confirm the presence of P. erythropterus for the Uruguayan territory .

fig. 3

Oligosarcus robustus before and after fixation: MHNM 4430,

91.8 mm SL, Cañada de las Pajas, Paso de las Mercedes,

32°30'34"S 53°31'04"W, Cerro Largo, Uruguay fig. 4 Psalidodon erythropterus before and after fixation: MHNM 3501 , 63.7 mm SL, mouth of Arroyo Mauricio , 34°42'28"S 56°41'42"W, San José, Uruguay . Upper picture flipped.

Figures

fig. 7 Distribution map of the recorded species: yellow = Aphyocharax rathbuni; green = Oligosarcus robustus; red = Psalidodon erythropterus; blue = Pseudocorynopoma stanleyi. Triangles = records from Uruguay; circles = records from outside Uruguay based on literature. Py. = Paraguay; Uy. = Uruguay.