Brucerolis osheai, Storey & Poore, 2009

Storey, Melissa J. & Poore, Gary C. B., 2009, New species of Brucerolis (Crustacea: Isopoda: Serolidae) from seas around New Zealand and Australia, Memoirs of Museum Victoria 66 (1), pp. 147-173 : 164

publication ID	https://doi.org/ 10.24199/j.mmv.2009.66.15
DOI	https://doi.org/10.5281/zenodo.12211949
persistent identifier	https://treatment.plazi.org/id/038EC15C-FFC7-662D-FF5E-FCF8FAD3FAEA
treatment provided by	Felipe
scientific name	Brucerolis osheai
status	sp. nov.

Treatment

Brucerolis osheai View in CoL sp. nov.

Figures 1g View Figure 1 , 14 − 17 View Figure 14 View Figure 15 View Figure 16 View Figure 17

Material examined. Holotype: New Zealand, Challenger Plateau , 49°30.5'S, 167°40'E, 594 m, 16 Jan 1965 ( NIWA stn F90), NIWA 27442 View Materials (adult male, 21 mm). GoogleMaps

Paratypes: collected with holotype, NIWA 27441 View Materials (adult female, 21 mm) GoogleMaps , NIWA 27440 View Materials (adult female, 22 mm) GoogleMaps , NMV J55316 View Materials (1 male, 1 female, 1 juvenile), NIWA 27438 View Materials (2 males, 1 juvenile) . New Zealand, Challenger Plateau , 48°45'S, 172°00'E, 649 m, 21 Jan 1965 ( NIWA stn F107), NIWA 27437 View Materials (9 males, 7 females, 3 juveniles); 52°21'S, 173°09'E, 603 m, 01 Jan 1965 ( NIWA stn F1470), NIWA 27432 View Materials (3 males, 4 females, 1 juvenile); 51°20'S, 172°42'E, 539 m, 30 Jan 1965 ( NIWA stn F136 TAM), NIWA 27436 View Materials (2 males); 50°31.5'S, 168°00'E, 433 m, 15 Jan 1965 ( NIWA stn F88 TAM), NIWA 27433 View Materials (2 males, 2 juveniles); 48°32'S, 168°54.5'E, 695 m, 18 Jan 1965 ( NIWA stn F99 TAM), NIWA 27439 View Materials (7 males, 2 females, 2 juveniles) GoogleMaps .

Description of male holotype. Body length 21 mm. Body 0.85 times as long as greatest width (at coxae 3). Middorsal line without midposterior processes, not elevated in lateral view. Head, anterolateral margins convex and continuous with anterior margin of pereonite 1; width between anterolateral corners 1.2 times as wide as maximum span between lateral margins of eyes; head with paired strongly projecting curving acute processes on transverse ridge at bases of antennae 1, with prominent paired tubercles between eyes, with small, blunt median posterior tubercle, with obscure lobes lateral to median posterior tubercle. Pereonite 1 lateral margin convex anteriorly, straight over most of length, lateral margin upturned over anterior half, sharply crested, with sinuous broadly rounded oblique ridge more or less parallel to margin, separated from it by a shallow concave trough occupying about one-third of width, dorsal surface with obsolete oblique-transverse ridge. Coxal dorsal plate 2 as long as half pereonal tergite 2 width (following plates increasing in length); plate 4 1.8 times as long as half pereonal tergite 4 width; plate 6 extending beyond tip of pleotelson by 2.2 times middorsal length of pleotelson, the pair parallel, straight distally; pleonal epimeron 2 1.7 times length of pleotelson; pleonal epimeron 3 as long as pleotelson; pleonal epimera 2 and 3 with acute apices. Ventral coxal plates 2–4 with transverse ridges on mesial, anterior and posterior margins outlining a transverse depression. Antenna 1 peduncle articles 3+4 2 times as long as article 2 (anterior margin); flagellum of about 50 articles. Antenna 2 peduncle article 5 1.1 times as long as article 4; flagellum of 16 articles. Pereopod 1 propodus 1.9 times as long as greatest width. Pereopod 2 palm dorsal length 1.7 times greatest width, with short right-angled heel, convex palm, with 13 robust setae in U-shaped row. Pereopod 7 carpus 3 times as long as greatest width; propodus 3.5 times as long as greatest width, propodus elongate oval, widest at midpoint; dactylus curved, 0.4 times as long as propodus. Pleopod 2 endopod with evenly tapering distal angle bearing appendix masculina; appendix masculina 6 times as long as straight margin of endopod. Uropodal exopod 0.9 length of endopod.

Female. Pereonite 1, lateral margin of female as in male. Coxal dorsal plate 2 of female 0.6 times as long as half pereonal tergite 2 width; plate 4 of female as long as half pereonal tergite 4 width (following plates increasing in length); plate 6 of female extending beyond tip of pleotelson by 1.9 times middorsal length of pleotelson, the pair diverging over entire length, almost straight except at apex.

Size. Male length: 21 − 22 mm; female length: 19 − 22 mm.

Distribution. New Zealand, Campbell Plateau, 48°S − 52°S, 168°E − 174°E, 347 − 735 m.

Etymology. For Steve O’Shea, who arranged for the loan of the material from New Zealand on which much of this work is based.

Remarks. Brucerolis osheai is similar to B. hurleyi but may be distinguished by a more pronounced median posterior tubercle on the head, the anterolateral corners of head continuous with anterior margin of pereonite 1, a generally smaller body with characteristic pigment spots on the antennae, head and pereonites, a setulate lower margin of the male pereopod 7 merus, carpus and propodus and ridged ventral coxae.