Sistemática dos peixes da subfamília hypoptopomatinae (siluriformes loricariidae) da coleção ictiológica do museu paraense Emílio Goeldi (MPEG).

Abstract

Hypoptopomatinae (Siluriformes, Loricariidae) is a monophyletic group of rattlesnakes up to 120 mm long that comprises 16 genera and 79 species. It is distributed throughout Cis-Andina South America, from Venezuela to Argentina, occurring in medium and small rivers and streams. This work provided systematic studies of the specimens of the subfamily Hypoptopomatinae from the collection of the Museu Paraense Emílio Goeldi (MPEG) and contributed to the increased knowledge of the biodiversity and distribution of species in the group. Direct and indirect observations were made with stereomicroscopes and measurements for each specimen analyzed were made with the aid of a Mitutoyo pachymeter model to the tenth of a millimeter, for the specific identification which was based on specialized literature. We identified 416 specimens, classified into 4 genera and 11 species: Acestridium dichromum (N=157); Acestridium discus (N=3); Otocinclus hoppei (N=120), Otocinclus vittatus (N=60), Otocinclus sp. 1 (N=1) Otocinclus sp. 2 (N=60), Otocinclus sp. 3 (N=7), Hypoptopoma sp. 1. (N=5), Hypoptopoma sp. 2. (N=1), Hypoptopoma sp. 3. (N=1), Oxyropsis acutirostris (N=1). Otocinclus and Hypoptopoma specimens were initially identified to the generic level which were later identified as three morphospecies for each genus. Oxyropsis acutirostris was ratified as a species and two new species were added to the collection, Acestridium dichromum and Acestridium discus. Besides providing a thorough analysis of the Hypoptopomatinae species in the MPEG collection, this study provided the discovery of Acestridium dichromum for the state of Pará