Isbrueckerichthys epakmos, a new species of loricariid catfish from the rio Ribeira de Iguape basin, Brazil (Teleostei: Siluriformes)

Abstract

Isbrueckerichthys epakmos, new species, is described from the tributaries of the rio Juquiá, rio Ribeira de Iguape basin, São Paulo State, Brazil. The new species displays a unique sexual dimorphism. Mature males are distinguished from its congeners by having a well-developed soft fleshy area and a clump of hypertrophied short odontodes directed forward or slightly upward on anterior portion of snout. It is compared with I. duseni and I. alipionis, which occurs sympatrically in the rio Ribeira de Iguape drainage. A key to the species of Isbrueckerichthys is provided.<br>Isbrueckerichthys epakmos, nova espécie, é descrita a partir de exemplares capturados em afluentes do rio Juquiá, bacia do rio Ribeira de Iguape no estado de São Paulo, Brasil. A nova espécie se distingue dos outros congeneres pela presença em machos adultos de uma área intumescida bem desenvolvida e um conjunto de odontódeos hipertrofiados curtos e inclinados para frente ou ligeiramente voltados para cima na porção anterior do focinho. A nova espécie é comparada com I. duseni e I. alipionis que ocorrem simpatricamente na bacia do rio Ribeira de Iguape. Uma chave de identificação para as espécies de Isbrueckerichthys é fornecida

Karyotypic relationships among the tribes of Hypostominae (Siluriformes: Loricariidae) with description of XO sex chromosome system in a Neotropical fish species

“…This large diversity has resulted in problems of species identification and many new species have been continuously described (Pereira and Oyakawa, 2003;Cardoso and Silva, 2004). Traditionally, Loricariidae has been divided in six subfamilies: Hypostominae, Ancistrinae, Loricariinae, Hypoptopomatinae, Neoplecostominae and Lithogeninae (Reis, Kullander and Ferraris Jr, 2003).…”

High β‐diversity maintains regional diversity in Brazilian tropical coastal stream fish assemblages

“…Its depressed body (dorsal-ventrally flattened) covered by bony plates reduces water resistance (Geerinckx et al 2007), while the mouth structures shaped into a sucker disc allow individuals to adhere to submerged rocks (Covain & Fisch-Muller 2007). Therefore, the occurrence of this species is common on riffles, where the substrate is stable (rocks, boulders and blocks) and the water is well oxygenated (Pereira & Oyakawa 2003). On the opposite side of this gradient, D. iguape and G. pantherinus are associated with finer substrate and slower waters.…”

A new species of Hypostomus Lacépède, 1803 (Siluriformes: Loricariidae) from the upper rio Paraná basin, Southern Brazil

“…Measurements follow Weber (1985), Fisch-Muller et al (2001), and Pereira & Oyakawa (2003). Counts and nomenclature of median plate series were taken according to Schaefer (1997) with the modifications of Oyakawa et al (2005).…”