First record of the genus Hyalella (Amphipoda: Hyalellidae) from Santa Catarina State, Brazil, with description of two new species

Abstract

The amphipod HyalellaSmith, 1874 is exclusive to the Americas, and the South region of Brazil presents the greatest diversity of the genus. This paper presents two species of Hyalella from Santa Catarina state, Brazil. A new species from the municipality of Palmeira is characterized by oval eyes, absence of flanges, epimeral plates not accuminated, presence of three lateral pappose setae on article 4 in antenna 2, absence of plumose setae in the maxilliped, presence of comb-scales and absence of serrate setae in the gnathopods, presence of curved seta on the inner ramus of the uropod 1 and absence of lateral setae on the telson. A new species from Rio das Antas municipality main characteristics are absence of flanges, epimeral plates accuminated, absence of plumose setae and distal nail in the maxilliped, presence of comb-scales and absence of serrate setae in gnathopods, presence of curved seta on the inner ramus of the uropod 1 and absence of lateral setae on the telson. Here we expand the distribution and increase the morphological and taxonomic knowledge of the genus.

Two new species of Hyalella (Amphipoda, Dogielinotidae) from the Humid Chaco ecoregion of Paraguay

“…The two new Paraguayan taxa are also readily distinguishable from recently described Hyalella species from nearby Argentina ( Peralta and Miranda 2019 ; Vernica and Alejandra 2022 ) and southern Brazil ( Reis et al 2020 ; Limberger et al 2021 ; Rocha Penoni et al 2021 ; Talhaferro et al 2021a , b ) by the number and type of setae on the telson and uropods 1 and 3 (Figs 5B, D , 11B, D ). Their level of morphological differentiation also indicates that the new Paraguayan species cannot be subsumed under the South American H. curvispina Shoemaker, 1942 species complex, which appears to comprise significant cryptic diversity based on recent molecular marker analyses ( Waller et al 2022 ).…”

“…nov. and H. julia sp. nov. can be recognised as distinct species based on the taxonomic keys by Damborenea et al (2020) and morphological differences from other recently described South American species ( Reis et al 2020 ; Jaume et al 2021 ; Limberger et al 2021 ; Rocha Penoni et al 2021 ; Talhaferro et al 2021a , b ; Vernica et al 2022; Waller et al 2022 ; Peralta and Verónica 2023 ; Reis et al 2023 ). Both H. mboitui and H. julia show a smooth body without dorsal or lateral processes or mucronations, have pigmented eyes, and lack setae on the dorsal margin of uropod 3.…”

“…Recent taxonomic and genetic studies of Hyalella suggest that the full extent of its diversity and distribution is vastly underestimated ( Limberger et al 2021 ; Talhaferro et al 2021a ; Waller et al 2022 ). Therefore, reported discrepancies in regional taxonomic richness may be largely due to limited sampling ( Reis et al 2020 , 2023 ).…”

Genus Hyalella (Amphipoda: Hyalellidae) in Humid Pampas: molecular diversity and a provisional new species

“…Hyalella is a genus of epigean freshwater amphipods of America (Baldinger 2004) and is the only one present in South America (Reis et al 2020). Members of this genus are found in various freshwater environments such as lakes, ponds, and streams, clinging to vegetation and burrowing in bottom sediments (da Silva Castiglioni and ditions and pollution; in North America, Hyalella azteca is a standard organism in bioassays (Casset et al 2001).…”

New records of the troglobitic Hyalella veredae Cardoso & Bueno, 2014 (Crustacea, Amphipoda, Hyalellidae) from Minas Gerais caves, southeast Brazil, with notes on its natural history

“…The family Hyalellidae is composed only of Hyalella Smith, 1874, and it probably originated in South America (Väinölä et al 2008). The genus has a distribution restricted to Nearctic and Neotropical regions (Väinölä et al 2008), and 83 species have been described (Horton et al 2020), of which 30 occur in Brazil (Reis et al 2020).…”