A new species of Odontostilbe cope (Characiformes: Cheirodontinae) from rio Madeira basin diagnosed based on morphological and molecular data

Abstract

A new species of Odontostilbe is described from the rio Jaciparaná, rio Madeira basin, Rondônia, Brazil. Odontostilbe pacaasnovos differs from all its congeners, except O. pequira, by the colour pattern. Additionally, it differs from its congeners by the terminal mouth, number of cusps in the teeth of the premaxilla (5-7), number of branched rays in the anal fin (19-22), by the shape of dentary teeth (5-7 cusps with central cusp larger and longer than laterals cusps) and by the number of lamellae of the olfactory rosette (17-18 in male and 14 in female). Morphological and molecular comparisons corroborate the distinctiveness between O. pacaasnovos and its congeners, justifying its recognition as a new species.

A new species of Astronotus (Teleostei, Cichlidae) from the Orinoco River and Gulf of Paria basins, northern South America

“…Wijkmark et al (2012) apparently found a specimen (28 specimens had only two elements) of Andinoacara blombergi with three supraneural bones, but they do not present any supporting illustration. The presence of such a high number of supraneural elements is best known in Ostariophysan fishes ( Fink and Fink 1981 ; Chuctaya et al 2020 ; Stiassny et al 2021 ), but not in American cichlids. This is an important and new topic that should be studied further.…”

Expanding the Distribution and Phylogenetic Insights ofChrysobrycon mojicaiin the Peruvian Amazon: Morphological and Molecular Analyses with Taxonomic Corrections

“…Of these sequences, 39 belonged to members of the Stevardinii tribe (genera Chrysobrycon, Corynopoma, Gephyrocharax, Hysteronotus, Pseudocorynopoma, and Pterobrycon). The remaining sequences, selected from related characids sensu Thomaz et al [8], were treated as Ortega 1995, [32 -37] and Cheirodontinae sequencies of Chuctaya et al [38] and Javonillo et al [39]. A phylogenetic analysis using maximum likelihood (ML) was run in RAxML-HPC2 on XSEDE 8.2.9 [40,41] via CIPRES portal v3.3 [42] using the coI dataset.…”