A new species of Farlowella (Siluriformes: Loricariidae) of the F. nattereri species-group from the rio Xingu basin, Mato Grosso, Brazil, with comments on Farlowella jauruensis , a poorly-known species from the upper rio Paraguai basin

Abstract

A new species of Farlowella is described from eighteen specimens collected in the upper rio Xingu basin, Mato Grosso State, Brazil. The new species is a member of the Farlowella nattereri species-group and can be distinguished from other members of the group, with exception of Farlowella jauruensis, by exhibiting a proportionally shorter snout. The new species is distinguished from F. jauruensis by differences on the cleithrum and plate morphology, by counts of pelvic and caudal-fin rays, and by the color pattern of the snout. The discovery of new lots of F. jauruensis, a species so far known only from the holotype, is also herein reported. This discovery represents a considerable expansion of the geographic distribution and of the number of known specimens of F. jauruensis. Uma nova espécie de Farlowella é descrita de dezoito espécimes da bacia do alto rio Xingu, estado do Mato Grosso, Brasil. A nova espécie é membro do grupo de espécies da Farlowella nattereri, e é diagnosticada de outros membros deste grupo, com exceção de Farlowella jauruensis, por apresentar um focinho proporcionalmente mais curto. A nova espécie se diferencia de F. jauruensis por diferenças morfológicas do cleitro e de placas, pelas contagens de raios da nadadeira pélvica e caudal, e pelo padrão de colorido do focinho. A descoberta de novos lotes de F. jauruensis, uma espécie até então conhecida apenas pelo holótipo, também é aqui reportada. Esta descoberta representa uma expansão considerável da distribuição geográfica e do número de espécimes conhecidos de F. jauruensis.

A combined molecular and morphological phylogeny of the Loricariinae (Siluriformes: Loricariidae), with emphasis on the Harttiini and Farlowellini

“…These groups were proposed based mainly on the presence and number of vertical rows of lateral plates (counted from predorsal to lateral abdominal plates), number of rows of abdominal plates, degree of development of odontodes on the snout, and length and breadth of the snout. Subsequent to this study, descriptions of new species [99][100][101][102][103], followed the groups and characters outlined by Retzer and Page [81]. Nevertheless, five of those six species groups were not recovered as monophyletic (except for the Farlowella acus group) and the characters proposed to diagnose them are not phylogenetically informative.…”

A new species of Farlowella (Siluriformes: Loricariidae) from the upper Bermejo River, La Plata River basin, northwestern Argentina

“…Standard length (SL) is expressed in mm and all other measurements are expressed as percentages of SL, except subunits of the head, which are expressed as percentages of head length (HL). Terminology, meristics and measurements follow Ballen et al (2016a). Meristics are reported followed by their frequencies in parentheses with an asterisk indicating the count of the holotype.…”

“…platorynchus Retzer, Page, 1996 F. rugosa Boeseman, 1971 Farlowella curtirostra sensu Retzer, Page, (1996) F. curtirostra Myers, 1942 F. taphorni Retzer, Page, 1996 Farlowella knerii sensu Retzer, Page (1996) F. knerii Steindachner, 1883F. schreitmuelleri Ahl, 1937 Farlowella mariaelenae sensu Retzer, Page (1996) F. mariaelenae Martín Salazar, 1964 Farlowella nattereri sensu Ballen et al (2016a) F. altocorpus Retzer, 2006 Farlowella azpelicuetae sp. n. Terán, Ballen, Alonso, Aguilera, Mirande, 2019 (present Mouth ovoid, lower lip longer than upper lip; wide oval papillae on upper lip and round papillae on lower lip; decreasing in size from oral aperture to lip margin; lip margin papillose.…”

A new species of Sturisoma (Loricariidae: Loricariinae) from the Madre de Dios River basin, Peru, with a key to all congeners and comments on the type series of Sturisoma rostratum

“…Counts and nomenclature of lateral plate series follow Ballen et al . (), nomenclature of abdominal plate series follow Londoño‐Burbano & Reis () and tooth cusp names follow Müller & Weber (). Number of specimens in alcohol and cleared and stained are indicated by alc and c&s, respectively.…”