Abstract
ABSTRACT Hypostomus johnii (Steindachner) was described from the rio Parnaíba basin in the state of Piauí and the rio São Francisco basin in the state of Bahia. Despite the good quality of the original description of H. johnii, it does not currently allow its distinction from congeners. Thus, H. johnii is redescribed based on the analysis of the types and several recently collected specimens. Recent collecting efforts of the rios Parnaíba and São Francisco basins resulted in specimens only being found in the rio Parnaíba basin. This raises doubts about whether H. johnii occurs in the rio São Francisco basin. The species is distinguished from its congeners by having a high number of teeth on the premaxilla and dentary (between 60-115); small to moderate-sized dark spots with a light background; absence of keels on flanks; and abdominal plates more evident on laterals. A lectotype of H. johnii is designated herein and H. eptingi is considered a junior synonym of H. johnii.
Highlights
Loricariidae is found throughout South America, Panama, and Costa Rica (Armbruster, Page, 2006)
Considering its broad geographic distribution recently collected in the high, medium and low Parnaíba basin, states of Ceará, Piauí and Maranhão, Brazil, Hypostomus johnii does not match any of the extinction risk categories (IUCN) and for this reason we propose that the species be classified as Least Concern (LC) following the International Union for Conservation of Nature (IUCN) categories and criteria (IUCN Standards and Petitions Subcommittee, 2016)
The high number of teeth in the upper and lower jaws of Hypostomus johnii is the primary distinguishing character of this species from several of its congeners. This feature is especially important when distinguishing H. johnii from other species of Hypostomus occurring in the Northeastern Caatinga and Coastal Drainage ecoregion
Summary
Loricariidae is found throughout South America, Panama, and Costa Rica (Armbruster, Page, 2006). The family has about 80 genera and over 800 species (Eschmeyer, Fong, 2015), of which Hypostomus Lacépède, 1803 is its most diverse genus (Isbrücker, 2001; Armbruster, 2004). Hypostomus johnii (Steindachner, 1877) was originally described from rio Poti (a tributary of rio Parnaíba, misspelled in original description as “Puty”) and rio Preto (a tributary of rio São Francisco). This accounts for the registered distribution of Hypostomus johnii being considered as occurring in the Parnaíba and São Francisco ecoregions (sensu Abell et al, 2008). Five species of Hypostomus are described from the São Francisco ecoregion: Hypostomus alatus Castelnau (1855) (type locality: Sabará, state of Minas Gerais), Hypostomus francisci (Lütken, 1874) and H. lima (Lütken, 1874) (type locality: from the upper portion of the rio São Francisco basin), Hypostomus vaillanti (Steindachner, 1877) (type locality: rio Preto - at Vila de Santa Rita, a tributary of the rio São Francisco basin, state of Bahia), and Hypostomus garmani (Regan, 1904) (type locality: rio das Velhas)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
