Three new species of Hyalella (Crustacea: Amphipoda: Hyalellidae) from the Southern Brazilian Coastal Plain

Abstract

In this study, three new species of Hyalella (Crustacea: Amphipoda: Hyalellidae) are described based on specimens collected in wetlands located in three freshwater ecoregions (Southeastern Mata Atlântica, Tramandaí-Mampituba and Laguna dos Patos) of the southern Brazilian Coastal Plain (states of Rio Grande do Sul and Santa Catarina). Hyalella minuana n. sp. was recorded in the southernmost region of the state of Rio Grande do Sul. This species is characterized by presenting smooth body surface, epimeral plates not acuminated, nine serrate setae on the inner face of gnathopod 1, and peduncle of uropod 3 with four cuspidate setae with accessory seta and without plumose seta on the margin of the telson. Hyalella lagoana n. sp. was recorded in the northern region of Rio Grande do Sul and southern region of Santa Catarina. This species shows body surface smooth, epimeral plates not acuminated, nine serrate setae on the inner face of gnathopod 1, peduncle of uropod 3 with five cuspidate setae with accessory seta, and telson with six cuspidate setae with accessory seta without plumose seta on the margins. Hyalella sambaqui n. sp. was recorded in the state of Santa Catarina. This species is characterized by presenting smooth body surface, epimeral plates not acuminated, six serrate setae on the inner face of gnathopod 1, peduncle of uropod 3 with three cuspidate setae with accessory seta, and telson with three cuspidate setae with accessory seta and four plumose setae on the margin of the telson. The new records elevates the known diversity of species of Hyalella in the Brazilian territory to 33 species (19 in the southern Brazilian region) and to 83 species in the Americas.

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

“…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.…”

“…This diverse genus comprises more than 100 described species, and over 80 of them are endemic to South America ( Marrón-Becerra and Hermoso-Salazar 2023 ; Marrón-Becerra et al 2023 ; Peralta and Verónica 2023 ; Reis et al 2023 ; Tomikawa et al 2023 ). In particular, numerous species of the genus have been reported from Argentina, and southern Brazil, which holds the highest diversity of any single country ( González et al 2006 ; Talhaferro et al 2021a , b ; Reis et al 2023 ). However, occurrences of this genus have not been systematically documented in their neighbouring country, Paraguay.…”

Description of a new thermal species of the genus Hyalella from Peru with molecular phylogeny of the family Hyalellidae (Crustacea, Amphipoda)

“…Smith, 1874 was previously included in Dogielinotidae Gurjanova, 1953, of Hyaloidea (Serejo 2004) but is currently assigned to Hyalellidae Bulyčeva, 1957 (Lowry and Myers 2019). Hyalellidae comprises only one genus, Hyalella , 98 species of which have been found in North and South America (Bousfield 1996; Rocha Penoni et al 2021; Talhaferro et al . 2021; Limberger et al .…”

“…Smith, 1874 was previously included in Dogielinotidae Gurjanova, 1953, of Hyaloidea (Serejo 2004) but is currently assigned to Hyalellidae Bulyčeva, 1957 (Lowry and Myers 2019). Hyalellidae comprises only one genus, Hyalella, 98 species of which have been found in North and South America (Bousfield 1996;Rocha Penoni et al 2021;Talhaferro et al 2021;Limberger et al 2022;Marrón-Becerra and Hermoso-Salazar 2022;Verónica and Alejandra 2022). Hyalella occurs in freshwater; most are surface species but a few groundwater species are also known (Cardoso et al 2014;Rodrigues et al 2014).…”

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

“…There are 84 described species of Hyalella (Tuparai Talhaferro et al 2021;Limberger et al 2021), but taxonomic knowledge of the genus is incomplete. Highly complex cryptic species with very subtle interspecific and interpopulation morphological variations (Worsham et al 2017) make identifying and differentiating species challenging.…”