A new species of Acutiserolis Brandt, 1988 (Isopoda: Serolidae) from the deep sea of southern Brazil

A new species of Serolidae is described from deep waters off the southern coasts of Brazil, between 1190 and 1555 meters depth. Acutiserolis coineauae sp. nov. The specimens were collected during the cruise TAAF MD55/Brazil. A. coineauae is compared with Serolis insignis Moreira, 1977 and Acutiserolis neaera (Beddard, 1884) illustrated and diagnosed. Key words: Serolidae, New species, Deep sea, MD55/Brazil. benthic samples, especially the Serolidae that were represented by six species. Among the material a new species of the genus Acutiserolis Brandt, 1988 was found on the bathyal zone. This new species is described in this contribution. Material and Methods Specimens of Serolidae were collected from the deep sea, by means of a beam trawl during the MD55/Brazil cruise organized by Santa Ur‑ sula University (Brazil) and the Muséum national d'Histoire naturelle de Paris (France). The type material is deposited in the Museum of Zoology, São Paulo (MZUSP). All illustrations are of left limbs unless oth‑ erwise noted, labeled as follows: AT1 = antennula; AT2 = antenna; MD = mandible; MX1, 2 = max‑ illae 1, 2; MXP = maxilliped; P1‑P7 = pereopods 1‑7; PL1‑PL5 = pleopods 1‑5; Ur = uropod; l = left; r = right, other alphabetical letters are even used to show details.