Brucerolis gen. n., and Acutiserolis Brandt, 1988, deep-water southern genera of isopods (Crustacea, Isopoda, Serolidae)

Abstract

Brucerolis gen. n., and Acutiserolis Brandt, 1988, deep-water Abstract Acutiserolis Brandt is rediagnosed (coxal dorsal plates 2-5 slot into each other with no aperture between; coxal plate 6 has a blunt process on its anterior margin slotting into a groove on coxa 5 and isolating an oval aperture; with prominent middorsal pereonal and pleonal spines; pleotelson with a sharp middorsal keel, upturned posteriorly; and sharply defi ned longitudinal sublateral keels ending acutely) and confi ned to the type species, Serolis spinosa Kussakin, 1967, and two species of Cuspidoserolis Brandt, 1988 syn. n. Brucerolis gen. n., (type species Brucerolis nowra sp. n.) is erected for species previously assigned to Acutiserolis but from which it diff ers in having the coxal dorsal plates 2-6 interacting only by means of key-like lobes, coxal plate 6 exceeding the pleotelson by at least the pleotelson length, middorsal spines being absent or obscure, and the pleotelson lacking ridges and keels. Four other species are included: Brucerolis bromleyana (Willemöes-Suhm, 1876); B. cidaris (Poore & Brandt, 1997); B. macdonnellae (Menzies, 1962); and possibly B. maryannae (Menzies, 1962).

Acutiserolis poorei sp. nov. from the Amundsen and Bellingshausen Seas, Southern Ocean (Crustacea, Isopoda, Serolidae)

“…Like in A. spinosa, no suture divided the coxal plates of the fi fths coxa from the body in A. poorei which is visible at pereomers 2 to 4, however, the male appendix masculina of A. poorei is shorter than that of A. spinosa (however, this could be due to the fact that we might have sampled only a sub-adult male). The comparison of the type of A. spinosa revealed some slight differences to the photographs presented by Poore and Storey (2009) (fi gure 5) with regard to the length of the pereonites and the strength of the dorsal spines. In fact the types have been sampled at 67°S, whereas the material Poore & Storey (2009) use for their description is from 65°S.…”

“…The comparison of the type of A. spinosa revealed some slight differences to the photographs presented by Poore and Storey (2009) (fi gure 5) with regard to the length of the pereonites and the strength of the dorsal spines. In fact the types have been sampled at 67°S, whereas the material Poore & Storey (2009) use for their description is from 65°S. Acutiserolis gerlachei (Monod, 1925) has an acuminating pleotelson with a frontomedial elevation which is lacking in A. poorei.…”

“…The genus diagnosis of Acutiserolis Brandt, 1988 had been referred to by Poore and Brandt in 1997 and recently been revised by Poore and Storey (2009) Diagnosis. Head with long mediocaudal acuminating spine reaching mid of third pereonite in dorsal view.…”

“…This was recently revised by Poore & Storey (2009) and Cuspidoserolis Brandt, 1988 synonymised with Acutiserolis. Poore & Storey (2009) presented an updated and extensive generic diagnosis.…”

New species of Brucerolis (Crustacea: Isopoda: Serolidae) from seas around New Zealand and Australia

“…Brucerolis differs from Acutiserolis in having the coxal dorsal plates 2-6 interacting only by means of key-like lobes, coxal plate 6 exceeding the pleotelson by at least the pleotelson length, middorsal spines being absent or obscure, and the pleotelson lacking ridges and keels. The type species, Brucerolis nowra Poore and Storey, 2009 is from the continental margin of eastern Australia but is not the only species there. Here, another is described along with four more from seas around New Zealand where they have been collected in their hundreds.…”