Hypostomus Lacépède

Osvaldo T. Oyakawa, Alberto Akama & Angela M. Zanata, 2005, Review of the genus Hypostomus Lacépède, 1803 from rio Ribeira de Iguape basin, with description of a new species (Pisces, Siluriformes, Loricariidae)., Zootaxa 921, pp. 1-27 : 2

publication ID

z00921p001

publication LSID

lsid:zoobank.org:pub:913A8172-1A2E-4784-96DB-50BACBEC7C25

DOI

https://doi.org/10.5281/zenodo.6268985

persistent identifier

https://treatment.plazi.org/id/E4891F99-4083-F775-F106-4565696530EF

treatment provided by

Thomas

scientific name

Hypostomus Lacépède
status

 

[[ Genus Hypostomus Lacépède View in CoL View at ENA   ZBK ]]

Hypostomus   ZBK , the type genus of the subfamily Hypostominae, constitutes an assemblage of bottom-dwelling loricariid fishes widely distributed throughout South America, occurring in a variety of freshwater ecosystems such as small mountain streams and large lowland river areas. Maximum diversity in number of species of Hypostomus   ZBK occurs in rivers of the Paraná-Paraguay system (Weber, 2003). As presently defined the genus consists of more than 130 nominal species (107 species considered valid by Weber, 2003 and expanded by Armbruster, 2004).

Species level taxonomy of Hypostomus   ZBK is still poorly known as well as the phylogenetic relationships within and of the genus. Hypostomus   ZBK was established by Lacépède (1803), who included in the genus only a single species, H. guacari   ZBK . Old descriptions, similar to Lacépède ’s, and available for various subsequent species added to the genus, are very often scanty, with incomplete or poor characterization of species. This fact, together with a number of Hypostomus   ZBK species yet to be described, makes the recognition of most taxa of the genus difficult. Hypothesis of phylogenetic relationships of Hypostomus   ZBK based on molecular data (Montoya-Burgos et al., 1997, 2002) revealed that the genus does not form a natural group. According to these authors, some species currently assigned to Hypostomus   ZBK should be removed from the genus, while the genus Cochliodon   ZBK should be treated as synonym of Hypostomus   ZBK , an action effectuated by Weber & Montoya-Burgos (2002: 265). Morphological based phylogenetic studies presented by Armbruster (2004) reinforce the conclusions above and place Aphanotorulus   ZBK and Isorineloricaria   ZBK in the synonymy of Hypostomus   ZBK . In spite of the cited studies, more detailed phylogenetic analysis of the relationships within Hypostomus   ZBK awaits for future studies.

The elevated number of species currently included in Hypostomus   ZBK , allied to the broad variability in morphology and color pattern of those taxa, poses difficulties for its entire revision. Various authors acquainted with these problems provided regional revisions of the genus, as exemplified by Boeseman (1968) with a study of the Surinam representatives of the genus, Weber (1985, 1986, 1987) that deals with Hypostomus   ZBK from Paraguay, more recently Reis et al. (1990) reviews and describes three new species from Southern Brazil, Mazzoni et al. (1994) provides a taxonomical revision of Hypostomus   ZBK from Lower rio Paraíba do Sul, State of Rio de Janeiro, Brazil, and finally Hollanda Carvalho & Weber (2004) provided a revision of Hypostomus cochliodon group   ZBK from middle and lower Amazon system.

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