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      Description of two new species of Hisonotus Eigenmann & Eigenmann, 1889 (Ostariophysi, Loricariidae) from the rio Paraná-Paraguay basin, Brazil

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          Abstract

          Abstract

          Two new species of Hisonotus are described from the rio Paraná-Paraguay basin in Brazil. The most remarkable features of the new species are the odontodes forming longitudinally aligned rows (one odontode after the other, but not necessarily forming parallel series) on the head and trunk ( vs. odontodes not forming longitudinally aligned rows), a pair of rostral plates at the tip of the snout ( vs. a single rostral plate), the functional v-shaped spinelet ( vs. spinelet non-functional, square-shaped, or absent). These features suggest close phylogenetic relationships with Hisonotus bockmanni, H. insperatus, H. luteofrenatus and H. piracanjuba. Additionally, both new species are distinguished from their congeners by characters related to head length and depth, orbital diameter, suborbital depth, caudal peduncle depth, pectoral-fin spine length, snout length and counts of teeth. Hisonotus paresi sp. n. further differs from its congeners by having contrasting dark geometric spots on the anterodorsal region of the body, a character lacking in H. oliveirai sp. n. The variation in number and shape of the rostral plate, posterior rostrum plates, infraorbitals and the preopercle in both new species and in H. insperatus are discussed.

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          III. A Monograph of the Fishes of the Family Loricariidae.

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            Description and relationships of Otothyropsis marapoama, a new genus and species of hypoptopomatine catfish (Siluriformes: Loricariidae) from rio Tietê basin, southeastern Brazil

            Otothyropsis marapoama, a new genus and species, is described based on specimens recently collected in a headwater stream of the middle stretch of the rio Tietê, a river from the upper rio Paraná basin in southeastern Brazil. The new taxon belongs to a clade also encompassing the genera Schizolecis, Otothyris and Pseudotothyris. Otothyropsis marapoama is hypothesized to be the sister-group of Pseudotothyris and Otothyris based mainly on the presence of several derived characters of the swimbladder capsule and associated bones. Several paedomorphic characters shared by Pseudotothyris and Otothyris and their significance for the phylogenetic position of the new genus are discussed.
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              Hisonotus insperatus: New Species, from the Upper Rio Paraná Basin (Pisces: Ostariophysi: Loricariidae)

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                Author and article information

                Contributors
                Journal
                Zookeys
                Zookeys
                ZooKeys
                ZooKeys
                Pensoft Publishers
                1313-2989
                1313-2970
                2014
                1 April 2014
                : 395
                : 57-78
                Affiliations
                [1 ]Universidade Estadual Paulista, Departamento de Morfologia, Laboratório de Biologia e Genética de Peixes, Botucatu, São Paulo State, Brazil
                [2 ]Universidade Estadual de Maringá, Departamento de Biologia, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupelia), Maringá, Paraná State, Brazil
                [3 ]Universidade do Estadual de Mato Grosso, Departamento de Ciências Biológicas, Tangará da Serra, Mato Grosso State, Brazil
                Author notes
                Corresponding author: Fábio F. Roxo ( roxoff@ 123456hotmail.com.br )

                Academic editor: N. Bogutskaya

                Article
                10.3897/zookeys.395.6910
                3978237
                24715789
                0b83dd0f-f405-4596-91c6-0ba8e0218023
                Fábio F. Roxo, Cláudio H. Zawadzki, Waldo P. Troy

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                Categories
                Research Article

                Animal science & Zoology
                cascudinhos,fresh water,head plates,hypoptopomatinae,neotropical fish
                Animal science & Zoology
                cascudinhos, fresh water, head plates, hypoptopomatinae, neotropical fish

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