First island species of Hyalella (Amphipoda, Hyalellidae) from Florianópolis, state of Santa Catarina, Southern Brazil

Abstract

The Hyalella comprises a group of freshwater amphipods endemic to the Americas. In Brazil, the greatest diversity of species known so far is concentrated in the state of Rio Grande do Sul, but recently discoveries were made in the neighboring state of Santa Catarina. The present work describes the first island species of the genus Hyalella in Brazil and the fifth with occurrence in the state of Santa Catarina. The species was found in streams of two watersheds, located at the Monumento Natural Municipal da Lagoa do Peri, an important environmental protection area on the island of Florianópolis, Southern Brazil. Hyalella insulae n. sp. shows the following characters: inner face of propodus of gnathopod 1 with 7 serrate setae, gnathopod 2 with propodus ovate, peduncle of uropod 3 with 10 cuspidate setae, telson rectangular, wider than long, with 6 cuspidate setae and 2 plumose setae laterally close to each distal seta. H. insulae n. sp. differs from the other species with occurrence in Santa Catarina, H. catarinensis, H. rioantensis, H. sambaqui and H. lagoana, mostly concerning to the number and shape of setae of the gnathopods, uropods and telson. A comparison was also made with species from the neighboring states, Rio Grande do Sul and Paraná. The description of H. insulae n. sp. in the present study contributes to increasing the knowledge of the Hyalella diversity in the state of Santa Catarina, little known so far.

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.…”

“…Amphipods are a diverse clade of peracaridan crustaceans inhabiting both marine and freshwater environments, where they represent an ecologically and taxonomically significant component of the planktonic and benthic invertebrate fauna ( Thomas 1993 ; Ishikawa and Urabe 2002 ). The genus Hyalella Smith, 1874 is endemic to the Americas and among the most widely distributed freshwater amphipods in the New World, ranging from southern Canada to Patagonia ( Bueno et al 2014 ; Damborenea et al 2020 ; Reis et al 2023 ). 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 ).…”

“…The genus Hyalella Smith, 1874 is endemic to the Americas and among the most widely distributed freshwater amphipods in the New World, ranging from southern Canada to Patagonia ( Bueno et al 2014 ; Damborenea et al 2020 ; Reis et al 2023 ). 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 ).…”

“…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.…”

“…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 ).…”