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Issue: Vol. 285 No. 1: 2 Sept. 2003
Type: Article
Published: 2003-09-02
DOI: 10.11646/zootaxa.285.1.1
Page range: 1–10
Abstract views: 34
PDF downloaded: 21

A new species of the loricariid catfish genus Hemipsilichthys from southern Rio de Janeiro coastal rivers, southeastern Brazil (Teleostei: Siluriformes)

Laboratory of Ichthyology, Pontifícia Universidade Católica do Rio Grande do Sul, P. O. Box 1429, 90619- 900, Porto Alegre, RS, Brazil
Laboratory of Ichthyology, Pontifícia Universidade Católica do Rio Grande do Sul, P. O. Box 1429, 90619- 900, Porto Alegre, RS, Brazil
Laboratório de Avaliação e Promoção da Saúde Ambiental - LAPSA, Departamento de Biologia, IOC, FIOCRUZ, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brazil
Laboratório de Ecologia de Peixes, Instituto de Ecologia, Universidade Federal do Rio de Janeiro – UFRJ, Rua Pau Brasil s/n. CCS, Bloco A sala A 010, Ilha do Fundão, 21941-569 Rio de Janeiro, RJ, Brasil
Pisces Fish Siluriformes Loricariidae Hemipsilichthys Neotropical Atlantic Forest systematics taxonomy new species

Abstract

Hemipsilichthys nimius, new species, is described from the upper Perequê-Açu River in Parati, in the southern coast of Rio de Janeiro State, southeastern Brazil. The new species is distinguished from the remaining 18 Hemipsilichthys species by modally having eight branched rays in the dorsal fin (vs. seven branched rays), by possessing a posteriorly expanded dorsal-fin membrane connecting the last dorsal-fin ray to the dorsum and, except from H. gobio and H. papillatus, by having teeth cusps equal in size (vs. small lateral cusp or unicuspid teeth in both dentary and premaxilla). From H. gobio and H. papillatus it is further distinguished by the larger orbital diameter and by its V-shaped dorsal-fin spinelet. Hemipsilichthys nimius shares with H. gobio and H. papillatus several characters that might be indicative of close relationships. These putative phylogenetic relationships are discussed.

References

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