Boreomysis

Daneliya, Mikhail E., 2023, Mysid Subfamily Boreomysinae (Crustacea: Mysida: Mysidae) in the Southeast Australian Deep-sea, Records of the Australian Museum (Rec. Aust. Mus.) 75 (2), pp. 87-124 : 93

Key to the Australian species of the subgenus Boreomysis sensu stricto

1 Telson cleft without anterior fissure ( Figs 1C,D ; 4F–H ) ........................................................... 2

—— Telson cleft with anterior fissure ( Fig. 5C,E ) ..................................... B. (B.) sphaerops Ii, 1964

2 Anterior margin of carapace with rounded lateral margins ( Fig. 4D ). Antennal scale rather broad, 3.3–4.2 times as long as wide; outer spine without additional spinules ( Fig. 4D,I ) ...................... B. (B.) sibogae Hansen, 1910

—— Anterior margin of carapace with angular lateral margins ( Fig. 1B ). Antennal scale rather narrow, 4.7–5.5 times as long as wide; outer spine with additional spinules ( Fig. 1B,J,K,L ) .......................... B. (B.) inopinata sp. nov.

Figures

Figure 1. Boreomysis (Boreomysis) inopinata sp. nov., holotype, male, 31 mm, AM P.106632. (A) habitus, lateral; (B) head, dorsal; (C) posterior part of body, dorsal;(D) posterior part of telson, dorsal; (E) posterior margin of abdomen, lateral; (F) posteriormargin of abdomen and proximal part of uropod (left side), ventral; (G) eye cornea, frontal; (H) antennular peduncle, medial; (I) male process of antennula, posterior; (J) antennal peduncle and scale, posterior; (K) distal part of antennal scale; (L) distolateral spine of antennal scale; (M) antennal peduncle, lateral; (N) uropod, ventral. Scales (mm):A, B = 10.0; C, E, F, N = 1.0; D, H, I, K, L (same scale as for K) = 0.5; G, J, M = 0.25.

Figure 4. Boreomysis (Boreomysis) sibogae. (A, D–G, I–K) female,31 mm, Tasmania,AMP.101174;(B) subadult male, New South Wales, AM P.106643; (C) juvenile, New South Wales,AM P.106640; (H) subadult male, New South Wales,AM P.106642. (A) head, lateral; (B) rostrum and eyes, lateral; (C) rostrum and eyes, lateral; (D) head, dorsal; (E) posterior margin of abdomen, lateral; (F) posterior margin of abdomen and telson (lateral spiniform setae not shown), dorsal; (G) posterior part of telson; (H) telson; (I) antennal scale; (J) uropodal endopod, ventral; (K) uropodal exopod (most of setae not shown); (L) pereopod 1 endopod, posterior. Scales (mm): 1.0.

Figure 5. Boreomysis (Boreomysis) sphaerops. (A–F, H–N) subadult female, New South Wales, AM P.106636; (G) subadult male, New South Wales,AM P.106637. (A) head, dorsal (antennal scale spine missing); (B) head, lateral; (C) posterior part of abdomen with telson and uropods (setae not shown), dorsal;(D) posterior margin of abdomen,lateral;(E) posterior part of telson;(F) antennal scale (distolateral spine missing); (G) distal part of antennal scale; (H) labrum,ventral;(I) mandibular palp, posterior;(J) left mandible, ventral; (K) right mandible, dorsal; (L) pars centralis of right mandible; (M) maxilla 1, posterior; (N) maxilla 2, posterior. Scales (mm):A–K, M, N = 1.0; L = 0.25.