A new species of Pseudione sensu lato (Isopoda: Bopyridae) on a squat lobster host from the deep South-West Atlantic

Abstract

A new bopyrid, Pseudione chiesai n. sp., is herein described based on an ovigerous female and an adult male found in the right branchial chamber on a specimen of Munida spinosa Henderson, 1885. This parasite was collected in the Mar del Plata submarine canyon at 819 m depth during the expedition “Talud Continental I” carried out by the Argentine RV Puerto Deseado in 2012. P. chiesai n. sp. belongs to the Pseudione “crénelés” group sensu Bourdon (1972, 1976), which currently contains seven species, all of which have galatheoid crabs as hosts. P. chiesai n. sp. can be separated from the other species in the Pseudione “crénelés” group by the following combination of characters: (1) both sides of the body convex, (2) frontal lamina with a few, shallow indentations, (3) coxal plates 1–4 and tergal projections 1–4 with distinct irregular margins, mainly on the right side, (4) pereomeres 5–7 with single/branched lateral digitations, (5) maxilliped palp well-developed and setose, and (6) pleon with lateral plates 1–5 distally rounded and directed laterally. The taxonomic position of this new species is briefly discussed.

Revision of the genus Oxyarcturus (Isopoda, Valvifera, Antarcturidae), with a description of a new deep-sea species from Argentina

“…These surveys resulted in a remarkable improvement in our knowledge of the benthic invertebrates from this area, i.e., cold-water corals, echinoderms, crustaceans, etc. (Martinez et al 2014;Doti 2017;Pereira and Doti 2017;Bernal et al 2018;Risaro et al 2020;Flores et al 2021;Pereira et al 2021;Roccatagliata 2023;among others). In particular, for the family Antarcturidae, three species collected by the above mentioned surveys were recently described: Xiphoarcturus kussakini Pereira, Roccatagliata & Doti, 2019, X. carinatus Pereira, Roccatagliata & Doti, 2019, and Fissarcturus argentinensis Pereira, Roccatagliata & Doti, 2020, bringing to 13 the number of species of Antarcturidae recorded off Argentina (Pereira et al 2019(Pereira et al , 2020.…”