Isbrueckerichthys Derijst

Fernando C. Jerep, Oscar A. Shibatta, Edson H. L. Pereira & Osvaldo T. Oyakawa, 2006, Two new species of Isbrueckerichthys Derijst, 1996 (Siluriformes: Loricariidae) from the rio Paranapanema basin, Brazil., Zootaxa 1372, pp. 53-68: 53-54

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Isbrueckerichthys Derijst


[[ Genus Isbrueckerichthys Derijst  ZBK  ]]

The genus Isbrueckerichthys  ZBK  was proposed by Derijst (1996) to include the species Pareiorhaphis duseni (Miranda Ribeiro, 1907)  and Pareiorhaphis alipionis Gosline, 1947  ZBK  . This proposal was justified based on the discovery of an earlier type-species designation by Regan (1920), which had fixed Hemipsilichthys calmoni Steindachner, 1907  as the type species of genus Pareiorhaphis  ZBK  , making Pareiorhaphis  ZBK  a synonym of Hemipsilichthys  and dislocating P. duseni  and P. alipionis  ZBK  , once they do not fit in the new designation (sensu Derijst 1996).

Isbrueckerichthys  ZBK  is composed of small- to medium-sized species (up to 90.2 mm SL) of loricariids (suckermouth armored catfishes). Although a phylogenetic diagnosis for Isbrueckerichthys  ZBK  is until now unavailable, this genus is distinguished from other neoplecostomines by a combination of characters: small naked area behind the pteroticsupracleithrum, abdomen with small platelets embedded in skin between pectoral girdle and pelvic-fin insertions, dorsal fin with one spine and seven branched rays, caudal peduncle ovoid in cross-section and lacking a series of papillae on the lower lip of the dentaries. Species of this genus are commonly found in small to medium headwater streams with clear, fast running, and well-oxygenated water, where the bottom is composed of rocks, boulders, and sometimes gravel (Pereira & Reis 2002).

The three described species of Isbrueckerichthys  ZBK  are recognized and thought to be endemic to the rio Ribeira de Iguape basin: Isbrueckerichthys duseni (Miranda Ribeiro, 1907)  from the upper reaches of that basin in Paraná State, I. alipionis (Gosline, 1947)  , from the rio Betari, a tributary of rio Ribeira de Iguape and I. epakmos Pereira & Oyakawa, 2003  ZBK  from a tributary of the rio Juquiá in São Paulo State.

In the present paper two new species of Isbrueckerichthys  ZBK  are described, both of them collected in headwater streams of rio Tibagi, rio Paranapanema basin, in Paraná State, Brazil. These species represent the first Isbrueckerichthys  ZBK  species in the Paraná River basin and an increase in the geographic distribution range of the genus.