Schooling Mini Tetra

description

1. Transitional vertebrae with haemal canal (229): (1> 0) present. Reversal of synapomorphy 6 of node 195. Paralleled in Parecbasis cyclolepis. 2. Form and length of anterior anal-fin rays (290): (0> 1) longer and more compressed laterally than posterior rays. 3. Position of anal-fin bony hooks of adult males (316): (0> 1) medially positioned and oriented posteriorly.

Phylogeny of the family Characidae (Teleostei: Characiformes): from characters to taxonomy

description

original Chirodon calliurus first record Nion et al. (2002) remarks in N sub Serrapinnus piaba Malabarba (2003) mentions a distribution for S. calliurus in Uruguay, while he restricts S. piaba to the Sao Francisco basin. Therefore we assume that S. calliurus is the species found in Uruguay and referred to by N.

Check List of the Freshwater Fishes of Uruguay (CLOFF-UY).

description

Uruguayan specimens present all the mentioned characters and come from Artigas, Salto and Colonia Departments, mainly associated to the Uruguay River and its affluent, the Cuareim River (fig. 3). These specimens were collected in shallow lagoons, canals and wetlands. The material (one specimen) from Colonia was collected in a stream that drains into the Río de la Plata just in front of the Paraná River. We suggest that the presence of S. calliurus in the southwestern Uruguay is related to the latter river, probably not forming established populations in Colonia. Previously reported distribution of S. calliurus extends through La Plata River basin and Patos Lagoon System, in Argentina, Bolivia, Brazil, Paraguay and Uruguay (Miquelarena et al., 2008; Mantinian, 2011; Malabarba, 2003; Sarmiento et al., 2014). Reichert (2002) offers a drawing and a brief description of the coloration of “ Serrapinnus piaba ”, both quite non diagnostic as presented. The author does not specify if the drawing effectively belongs to a specimen collected in Uruguay or not. We formally attribute this record to S. calliurus due to the lack of the abdominal spot in the illustration by Reichert. Serrapinnus pi

First record of Serrapinnus kriegi (Schindler, 1937) and confirmed presence of S. calliurus (Boulenger, 1900) for Uruguay (Characiformes: Characidae)

diagnosis

This species differs from other congeners from the La Plata River basin by the following combination of characters: premaxillary teeth with 7 - 9 cusps, dorsal fin hyaline, incomplete lateral line, abdominal black spot absent and procurrent rays of the ventral profile of the caudal peduncle not anteriorly curved (Almirón et al., 2015; Jerep & Malabarba, 2014; Malabarba & Jerep, 2014; Mantinian, 2011; Miquelarena et al., 2008).

First record of Serrapinnus kriegi (Schindler, 1937) and confirmed presence of S. calliurus (Boulenger, 1900) for Uruguay (Characiformes: Characidae)