Taxonomic revision of doubtful Brazilian freshwater shrimp species of genus Macrobrachium (Decapoda, Palaemonidae)

Abstract

The freshwater prawns of the genus Macrobrachium Spence Bate, 1868 are widely distributed in rivers of tropical and subtropical regions and represent an interesting group with controversial taxonomy. The morphological characters traditionally used to separate species have shown a high intraspecific variation. Doubts about the status of M. birai Lobão, Melo & Fernandes, 1986, M. holthuisi Genofre & Lobão, 1978 and M. petronioi Melo, Lobão & Fernandes, 1986 have been arisen due to the high resemblance of the former two species with M. olfersi (Wiegmann, 1836), and the latter one with M. potiuna (Müller, 1880). Therefore, we performed a detailed morphological analysis of these species, including new characters not usually used in the species recognition. The present results here with molecular data lead us to conclude that M. birai and M. holthuisi are junior synonyms of M. olfersi, and M. petronioi is a junior synonym of M. potiuna. Considering these synonymies, 17 valid species are now reported for the Brazilian territory.

HABITAT CHOICE BEHAVIOR IN Macrobrachium brasiliense (HELLER, 1862) (DECAPODA, PALAEMONIDAE) UNDER LABORATORY CONDITIONS

“…Recently, new ecological surveys have reported for the first time the occurrence of M. brasiliense in the states of Amapá, Tocantins, and Mato Grosso do Sul (Pileggi et al 2013). Given this wide geographic distribution, it is important to highlight that most of the studies which have been conducted to date involve species distribution and taxonomic reviews (Kensley & Walker 1982, Coelho & Ramos-Porto 1984, García-Dávila & Magalhães 2003, Pileggi & Mantelatto 2012.…”

Length/weight relationship and condition factor of Macrobrachium jelskii (Miers, 1877) and M. brasiliense (Heller, 1862) (Decapoda, Palaemonidae) in two locations in the state of São Paulo

“…The genus Macrobrachium Spence Bate, 1868 are distributed worldwide in tropical and subtropical waters (De Grave and Fransen, 2011;Pileggi and Mantelatto, 2012). In Brazil, this genus includes 19 species (Mantelatto et al, 2016), besides some introduced species, such as Macrobrachium rosenbergii (de Man, 1979) (New and Valenti, 2000;Melo, 2003).…”

A kinetic characterization of the gill V(H+)-ATPase in juvenile and adult Macrobrachium amazonicum, a diadromous palaemonid shrimp

“…This diadromous shrimp has diversified into coastal populations that inhabit rivers close to estuaries and continental populations living in rivers, lakes and other inland water bodies (Charmantier and Anger, 2011;Anger, 2013). These two groups apparently differ in external morphology and meristic characters (Pileggi and Mantelatto, 2012). Coastal populations of M. amazonicum exhibit a lengthy larval sequence dependent on brackish water for development to the post-larva.…”