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

Abstract

This paper reports on part of the species of the marine isopod genus Serolis (Crustacea, Flabellifera, Serolidae) collected from benthic stations performed during one of the cruises of the Brazil ian Navy Oc/S "Almirante Saldanha" along southern South America. The species reported are Serolis polccris Richardson, 1911, Serolis elliptica Sheppard, 1933, Serolis uaperta Moreira, 1971, and Serolis foresti Bastida & Torti, 1970. A complete synonymy is given for each of these species, as well as the main distinctive characteristics enabling its ready recognition. Some remarks are provided on features not lengthned treated on previous accounts. The geographi cal distribution of all named taxa is given. Serolis uaperta is for the first time reported from off State of Rio Grande do Sul (Brazil) and Uruguay, extending considerably southernwards its southern limit of distribution. Both Serolis foresti and Serolis elliptica are also for the first time recorded from off Uruguay.

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, 1962), A. agassizi (George, 1986), A. menziesi (Hessler, 1970), A. venusta (Moreira, 1977).…”

“…Atlantosolis vemae (Menzies, 1962) can easily be distinguished from A. venusta (Moreira, 1977) 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, 1986) 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, 1977), 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 (1991) used the name, and Wägele (1994) 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, 1970), and Atlantoserolis venusta (Moreira, 1977), 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, 1982;Poore, 1985). Glabroserolis Menzies 1962 has uniramous uropods and no separate coxae, broad antennae and a quadrate maxilliped palp article 2 (Menzies, 1962).…”