Ichthyological Exploration of Freshwaters/IEF-1079/pp. 1-18 Published 16 May 2018
LSID: http://zoobank.org/urn:lsid:zoobank.org:...37-68ABBDA80FB2
DOI: http://doi.org/10.23788/IEF-1079
Ichthyol. Explor. Freshwaters – ISSN 0936-9902 (print)
© 2018 by Verlag Dr. Friedrich Pfeil, München, Germany www.pfeil-verlag.de


Redescription of Hypostomus latirostris (Regan, 1904) with the recognition of a new species of Hypostomus(Siluriformes: Loricariidae) from the upper rio Paraguay basin, Brazil

Authors

Cláudio Henrique Zawadzki*, Hugmar Pains da Silva** and Waldo Pinheiro Troy***



Abstract

Hypostomus latirostris was originally described by Regan (1904) from “River Jungada [= rio Jangada], Matto Grosso and Goyaz”; however, the species is rarely mentioned in taxonomic works on Hypostomus from Paraguay. Herein, the two syntypes of Plecostomus latirostris were examined showing critical differences between them. After the analysis of a large sample of recently collected specimens from the upper rio Paraguay basin we concluded that the two syntypes from the rio Jangada indeed belong to different species. Hypostomus latirostris is redescribed and a lectotype is designated herein. The other syntype (now a paralectotype of H. latirostris) is designated as paratype of Hypostomus renestoi, new species. Hypostomus renestoi can be differentiated from H. latirostris by having robust teeth (vs. slender); by having 28-77 teeth on the premaxilla (vs. 79-111) and 25-64 on the dentary (vs. 79-109); by having small and more conspicuous dark spots (vs. larger and less conspicuous dark spots); by having dorsal and mid-dorsal series of plates with moderate hypertrophied odontodes (vs. lacking hypertrophied odontodes on lateral series of plates); and usually by attaining a smaller size.

* Universidade Estadual de Maringá. Departamento de Biologia. Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Maringá, Paraná, Brazil. E-mail: chzawadzki@hotmail.com, corresponding author.
** Laboratório de Citogenética e Genética Animal, Instituto de Biociências, Universidade Federal do Mato
Grosso, Cuiabá, Mato Grosso, Brazil. E-mail: painsbio@gmail.com
*** Universidade do Estado de Mato Grosso. Departamento de Ciências Biológicas. Tangará da Serra, Mato
Grosso, Brazil. E-mail: waldotroy@gmail.com

Introduction

The Neotropical catfish family Loricariidae is the fifth most species-rich vertebrate family on Earth, with about a thousand of valid species and the Hypostominae is its most species-rich, geographically widespread, and ecomorphologically diverse subfamily (Lujan et al., 2015). Harboring about 475 valid species and 40 genera the Hypostominae (Eschmeyer et al., 2018) is a group of primarily herbivorous and detritivorous catfishes restricted to the freshwaters of tropical Central and South America (Silva et al., 2016). Hypostomus is the most diverse genus of the Hypostominae, currently having about 135 species (Zawadzki et al., 2016). Since the nineteenth century, species of the genus.

[[File:IEF-1079-www.pdf]]