Revision of Tympanopleura Eigenmann (Siluriformes: Auchenipteridae) with description of two new species

Abstract

The Neotropical catfish genus Tympanopleura, previously synonymized within Ageneiosus, is revalidated and included species are reviewed. Six species are recognized, two of which are described as new. Tympanopleura is distinguished from Ageneiosus by having an enlarged gas bladder not strongly encapsulated in bone; a prominent pseudotympanum consisting of an area on the side of the body devoid of epaxial musculature where the gas bladder contacts the internal coelomic wall; short, blunt head without greatly elongated jaws; and smaller adult body size. Species of Tympanopleura are distinguished from each other on the basis of unique meristic, morphometric, and pigmentation differences. Ageneiosus melanopogon and Tympanopleura nigricollis are junior synonyms of Tympanopleura atronasus. Tympanopleura alta is a junior synonym of Tympanopleura brevis. A lectotype is designated for T. brevis. Ageneiosus madeirensis is a junior synonym of Tympanopleura rondoni. Tympanopleura atronasus, T. brevis, T. longipinna, and T. rondoni are relatively widespread in the middle and upper Amazon River basin. Tympanopleura cryptica is described from relatively few specimens collected in the upper portion of the Amazon River basin in Peru and the middle portion of that basin in Brazil. Tympanopleura piperata is distributed in the upper and middle Amazon River basin, as well as in the Essequibo River drainage of Guyana.O gênero de bagres neotropicais Tympanopleura, anteriormente sinonimizado em Ageneiosus, é revalidado e as espécies incluídas são revisadas. Seis espécies são reconhecidas, duas das quais são descritas como novas. O gênero Tympanopleura é distinto de Ageneiosus por possuir uma bexiga natatória grande e não fortemente encapsulada em osso; um pseudotímpano proeminente consistindo de uma área no lado do corpo sem musculatura epaxial onde a bexiga natatória contacta a parede interna da cavidade celômica; cabeça curta, sem mandíbulas muito prolongadas, e menor tamanho do corpo de adultos. Espécies de Tympanopleura são distintas umas das outras com base em diferenças únicas em dados merísticos, morfométricos e de pigmentação. Ageneiosus melanopogon e Tympanopleura nigricollis são sinônimos júnior de Tympanopleura atronasus. Tympanopleura alta é um sinônimo júnior de Tympanopleura brevis. Um lectótipo é designado para T. brevis. Ageneiosus madeirensis é sinônimo júnior de Tympanopleura rondoni. Tympanopleura atronasus, T. brevis, T. longipinna e T. rondoni são relativamente bem distribuídas nas porções média e alta da bacia Amazônica. Tympanopleura cryptica é descrita a partir de alguns espécimes coletados na porção alta da bacia Amazônica no Peru e porção média dessa bacia no Brasil. Tympanopleura piperata está distribuída nas regiões alta e média da bacia Amazônica, bem como na drenagem do rio Essequibo, na Guiana.

Ichthyofauna from tributaries of Urubu and Amazonas rivers, Amazonas State, Brazil

“…The classification of families and subfamilies were presented in alphabetical order as consequence of incongruence between molecular and morphological phylogenetic proposes, or lack of resolution of relationships between them. Identification follows Géry (1960), Weitzman & Cobb (1975), Kullander (1986), Ploeg (1991), Vari (1992), Langeani (1996) All collect individuals and species were listed and quantified for each sampling site. The relative abundance in percentage was estimated for each site through the percentage of fish collected in each site in relation of the total collected.…”

Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species

“…Currently, the Auchenipteridae includes 23 genera and c . 118 valid species (Ferraris, , ; Rengifo et al ., ; Sarmento‐Soares & Martins‐Pinheiro, ; Pavanelli & Bifi, ; Peixoto & Wosiacki, ; Ribeiro & Rapp Py‐Daniel, ; Akama & Ferraris, ; Britski & Akama, ; Calegari et al ., ; Vari & Calegari, ; Walsh et al ., ; Eschmeyer et al ., ). Some species, particularly those of Ageneiosus Lacépède 1803, are commercially important.…”

“…Some species, particularly those of Ageneiosus Lacépède 1803, are commercially important. Auchenipterids are evolutionarily noteworthy due to the development of unique reproductive strategies involving elaborate courtship behaviours and distinctive sexual dimorphism including extreme modification of the male anal fin into a copulatory organ (von Ihering, ; Britski, ; Ferraris, ; Ferraris & Vari, ; Royero, ; Akama, ; Birindelli, ; Walsh et al ., ). Species of the family Auchenipteridae and Scoloplacidae are the only Neotropical Siluriformes documented to have internal fertilization (Nelson et al ., ).…”

“…A second revision of species included in Ageneiosus was conducted by Walsh (), who recognized 10 valid species, including the species previously described in Tympanopleura , based on two putative synapomorphic characters: the absence of mental barbels in adults and the dorsal margin of the maxillary barbels of nuptial males with enlarged, tooth‐like hooks formed by outgrowths of the maxilla (Walsh, ; Ribeiro & Rapp Py‐Daniel, ). A recent revision re‐elevated Tympanopleura to generic status and recognized six valid species (Walsh et al ., ).…”

“…Auchenipterids are exclusively Neotropical Siluriformes that are widely distributed in all major South American drainages (Ferraris, 2003). Currently, the Auchenipteridae includes 23 genera and c. 118 valid species (Ferraris, 2003(Ferraris, , 2007Rengifo et al, 2008;Sarmento-Soares & Martins-Pinheiro, 2008;Pavanelli & Bifi, 2009;Peixoto & Wosiacki, 2010;Ribeiro & Rapp Py-Daniel, 2010;Akama & Ferraris, 2011;Britski & Akama, 2011;Calegari et al, 2014;Walsh et al, 2015;Eschmeyer et al, 2016). Some species, particularly those of Ageneiosus Lacépède 1803, are commercially important.…”