A new species of Otothyropsis (Siluriformes: Loricariidae) from the upper RÃ*o Paraná basin, Paraguay, with a discussion of the limits between Otothyropsis and Hisonotus
Bárbara B. Calegari, Walter Gill Morlis und Roberto Reis
Abstract
Otothyropsis dialeukos is described from Itá creek, tributary to the upper RÃ*o Paraná basin, Paraguay. The new species is distinguished from its congeners by having a unique caudal-fin coloration pattern composed of a brown to almost black background with roundish hyaline blotches in the middle of the outermost branched rays and a hyaline posterior border interrupted in middle rays; abdomen entirely covered by enlarged plates, without naked areas; longer pectoral- and dorsal-fin spines; absence of a raised crest of enlarged odontodes on the posterior portion of the parieto-supraoccipital, and other morphometric and meristic features. Morphological traits and geographic distributions of all species of
Otothyropsis and
Hisonotus are analyzed and a discussion on the limits between those genera is presented.
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Gruß,
Karsten