Crustacea Isopoda collected during the Oc/S "Almirante Saldanha" cruises in southern South America: II. Additions to the species of Serolis (Flabellifera, Serolidae)

Abstract

This paper reports on part of the species of Serolis Leach, 1818 (Crustacea, Flabellifera, Serolidae) collected from benthic stations performed during cruises of the Brazilian Navy Oc/S "Almirante Saldanha" along southern South America. The species studied are Serolis schythei Lütken, 1858, Serolis polaris Richardson, 1911, Serolis foresti Bastida & Torti, 1970, Serolis uaperta Moreira, 1971, Serolis exigua Nordenstam, 1933 and Serolis elliptica Sheppard, 1933. New localities of occurrence are reported, as well as it is given a com plete synonymy for each species treated, and for Serolis schythei and Serolis exigua also its main distinctive characteristics.

Molecular differentiation in sympatry despite morphological stasis: deep-seaAtlantoserolis Wägele, 1994 andGlabroserolis Menzies, 1962 from the south-west Atlantic (Crustacea: Isopoda: Serolidae)

“…Atlantoserolis vemae (Menzies, ), A. agassizi (George, ), A. menziesi (Hessler, ), A. venusta (Moreira, ).…”

“…Atlantosolis vemae (Menzies, ) can easily be distinguished from A. venusta (Moreira, ) by the lack of spines. Its body surface shows some ornamentation, with small scales, whereas in A. venusta a pronounced median carina extends mediocaudally into a pointed tip (the Plt is triangular in shape).…”

“…The body surface of A. agassizi (George, ) is also smooth, but the Plt is round–oval in shape and broadly rounded caudally. In A. venusta the uropods are extending the length of the Plt and are superficially uniramous (Moreira, ), sympod and endopod are fused, exopod is freely articulated; however, it is obscure and minute, and inserts at one‐third the uropodal length from tip. The uropods of A. vemae possess an endopod of one‐third the length of sympod, the exopod is small, a sixth of the size of the endopod, almost quadrangular, and bears one distal seta.…”

“…Brandt () used the name, and Wägele () stated that the erection of the genus was justified and designated A. vemae as the type species. The genus comprises four species, A. vemae , A. agassizi , Atlantoserolis menziesi (Hessler, ), and Atlantoserolis venusta (Moreira, ), and can be distinguished from the other deep‐sea genera by having four pairs of separate coxae and a reduced uropod encased in the margin of the pleotelson (Cals, ; Poore, ). Glabroserolis Menzies has uniramous uropods and no separate coxae, broad antennae and a quadrate maxilliped palp article 2 (Menzies, ).…”