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

Gary Poore, Melissa Storey
2009 ZooKeys  
Brucerolis gen. n., and Acutiserolis Brandt, 1988, deep-water southern genera of isopods 143 Brucerolis gen. n., and Acutiserolis Brandt, 1988, deep-water southern genera of isopods (Crustacea, Isopoda, Serolidae) Citation: Poore GCB, Storey MJ (2009) Brucerolis gen. n., and Acutiserolis Brandt, 1988, deep-water south ern genera of isopods (Crustacea, Isopoda, Serolidae). In: Bruce N (Ed) Advances in the taxonomy and biogeography of Crustacea in the Southern Hemisphere. Abstract Acutiserolis
more » ... ndt 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) . A peer-reviewed open-access journal RESEARCH ARTICLE Brandt (1988) described the new genus Acutiserolis Brandt, 1988 and nominated Serolis spinosa Kussakin, 1967 as type species. She included Serolis bromleyana Willemöes-Suhm, 1876, S. macdonnellae Menzies, 1962, S. maryannae Menzies, 1962, and S. neaera Beddard, 1884a as other members. During preparation of descriptions of numerous new species of "Acutiserolis" with extremely long, attenuating, posteriorly directed coxae and epimera, Niel Bruce suggested to us that substantial diff erences existed between these and the type species of Acutiserolis, S. spinosa. Brandt (1988) did not examine the type material of S. spinosa during her revision, nor did others who have adopted her revision (e.g., Wägele 1994; Poore and Brandt 1997; Held 2000) . Topotypical specimens of Acutiserolis spinosa have been recently collected by New Zealand's National Institute of Water and Atmosphere (NIWA) in the Ross Sea, Antarctica. Th ese were made available to us by Niel Bruce and the diff erences between this and the other species are clearly apparent. In this contribution, Acutiserolis and a new genus and species, Brucerolis nowra, are diagnosed. A supplementary description and illustrations of A. spinosa are presented. Th e diagnosis is modelled on the characters used for example by Wägele (1994) and Poore and Brandt (1997) . In a subsequent paper we describe fi ve more species of Brucerolis (Storey and Poore in press) from southeastern Australia. Th e mouthparts, pereopods and pleopods of the two genera are very much alike, diff ering only slightly in proportions. Salient features that distinguish Brucerolis from Acutiserolis and from other genera are included in the generic diagnoses. Th e diagnoses and descriptions were prepared using a DELTA database (Dallwitz et al. 1993) . Type material is lodged in Museum Victoria, Melbourne (NMV) and the National Institute of Water and Atmosphere, Wellington, New Zealand (NIWA). Acutiserolis Brandt, 1988 Acutiserolis Brandt, 1988 : 21.-Brandt 1991: 131, 138-139. Serolis (Acutiserolis).-Wägele 1994: 53, 59. Not Acutiserolis.-Poore and Brandt 1997: 152 (= Brucerolis gen. nov.) Cuspidoserolis Brandt, 1988: 23.-Brandt 1991: 131, 138-139. -Wägele 1994 59-60 (type species: Serolis luethjei Wägele 1986 by original designation). syn. n. Type species. Serolis spinosa Kussakin, 1967 by original designation. Diagnosis. Body deeply incised between extremely long, attenuating, posteriorly directed coxal and epimeral plates; middorsal line dominated by strong middorsal spine (prominent in lateral view) on posterior margin of head, pereonites 2-4 and pleonites 1-3. Pereonite 6 to pleonite 1 fused middorsally and midventrally. Eyes contiguous with head margin posteriorly, 3 times as long as wide, with concave mesial margin. Coxal dorsal plates 2-4 delimited from tergite by suture; coxal dorsal plates 2-5 with
doi:10.3897/zookeys.18.129 fatcat:q4btgf537rh43n3vlytcqttaay