Oligosarcus platensis, Mirande, Juan Marcos, Aguilera, Gastón & Azpelicueta, María De Las Mercedes, 2011

Mirande, Juan Marcos, Aguilera, Gastón & Azpelicueta, María De Las Mercedes, 2011, A threatened new species of Oligosarcus and its phylogenetic relationships, with comments on Astyanacinus (Teleostei: Characidae), Zootaxa 2994, pp. 1-20 : 16

Oligosarcus platensis n. comb.

( Fig. 12 )

Astyanacinus platensis, Messner, 1962 Although the single-known specimen of Astyanacinus platensis Messner was not included in this phylogeny, a close examination by one of the authors (MMA) revealed that it has a row of, at least, two tricuspidate ectopterygoid teeth. A row of ectopterygoid teeth is present only in Oligosarcus and Xenagoniates , among the analyzed characids lacking a supraorbital bone. According to Mirande (2010), Xenagoniates is deeply nested into the Aphyocharacinae . Astyanacinus platensis shares with Oligosarcus , in addition to the row of tricuspidate ectopterygoid teeth (ch. 159, state 1; synapomorphy 4 of Oligosarcus ), a somewhat posteroventrally angled articulation between the second and third infraorbitals (ch. 62, state 2; synapomorphy 3 of Oligosarcus ), although this articulation in A. platensis is less angled that in the species of Oligosarcus . The articulation between the second and third infraorbitals in Xenagoniates and, indeed, in all the species of the clade composed of the Aphyocharacinae , Aphyoditeinae , and Cheirodontinae analyzed by Mirande (2010) is anteroventrally angled, in an opposite condition to that of A. platensis . Thus, this species is herein proposed to be transferred to the genus Oligosarcus .

Figures

FIGURE 12. Oligosarcus platensis, MHNM 762, holotype, 97.0 mm SL. Alcohol-preserved specimen.