Heteromysis, Czerniavsky, 1882

Daneliya, Mikhail E., 2021, On the Mysid Crustacean Genus Heteromysis (Mysidae: Heteromysinae) of the Tasman Sea, with Notes on the Tribe Heteromysini, Records of the Australian Museum (Rec. Aust. Mus.) 73 (1), pp. 1-50 : 7-8

Key to the Tasman Sea subgenera of Heteromysis

1 Uropodal endopod shorter than exopod. Antennular peduncle segment 3 with flagellated distomedial spiniform setae ( Figs 1A,F ; 5A,F ; 9A,F ; 18A ; 23A ). Pereopod 1 ischium with smooth medial margin (not counting setae, spine-setae and slight tubercles) ................................................................................................................................... 2

—— Uropodal endopod as long as or slightly longer than exopod. Antennular peduncle segment 3 with simple, non-flagellated distomedial setae. Pereopod 1 ischium with serrated medial margin ................................................................................ Gnathomysis Bonnier et Perez, 1902 2 Pereopod 1 merus with distomedial triangular process (not known in males of Heteromysis tasmanica ) ( Figs 2E , 7A,B , 10F , 14H ); carpopropodus segment 2 with strong, serrated paradactylary setae ( Figs 2G , 7 A−C, 10F,G, 14H,I). Eyestalk lacking distomedial spine or tubercle ( Figs 1A , 5A , 9A , 13B ) ................................... Heteromysis s. str.

—— Pereopod 1 merus without distomedial triangular process; carpopropodus segment 2 without strong, serrated paradactylary setae ( Figs 19G , 24D ). Eyestalk with distomedial spine or rarely tubercle ( Figs 18A , 23A ) ................................................................... Olivemysis Băcescu, 1968

Figures

Figure 1. Heteromysis (H.) communis, male, 4 mm, AM P.98680. (A) head, dorsal; (B) head, lateral; (C) posterior part of body, dorsal; (D) uropodal endopod, ventral; (E) posterior margin of abdomen, ventral; (F) distomedial setae of antennular segment 3, dorsal; (G) antenna 2, interocular process and labrum, ventral; (H) mandibular palp, lateral; (I) posterior seta of mandibular palp segment 2. Scales (mm): A−C = 1.0; D, E, G, H = 0.5; F, I = 0.25.

Figure 2. Heteromysis (H.) communis, male, 4 mm,AM P.98680.(A) maxilla 1, anterior; (B) maxilla 2, anterior; (C) maxilliped 1, anterior; (D) maxilliped 2, posterior; (E) pereopod 1 endopod, posterior; (F) distal part of pereopod 1 endopod, anterior; (G) distal part of pereopod 1 endopod, posterior; (H) pereopod 2 endopod, anterior; (I) pereopod 3, posterior; (J) distal part of pereopod 3 endopod, posterior. Scales (mm): A, F, G, J = 0.25; B−E, H, I = 0.5.

Figure 5. Heteromysis (Heteromysis) keablei sp. nov., holotype, male, 4.5 mm, AM P.75281: (A) head, dorsal; (B) abdominal somite 6 posteroventral margin; (C) telson; (D) telson posterior part; (E) uropod, dorsal; (F) distomedial spiniform setae of antenna 1 peduncle segment 3; (G) distomedial spiniform setae of antenna 1 peduncle segment 2; (H) segment 3 of antenna 2 peduncle, ventral; (I) antennal scale. Scales (mm): A−E, I = 0.5; F−H = 0.25.

Figure 7. Heteromysis (Heteromysis) keablei sp. nov. (A, C, F) holotype, male, 4.5 mm, AM P.75281; (B, D, E) paratype, male, 4.5 mm, AM P.98693. (A) pereopod 1 endopod, posterior; (B) pereopod 1 endopod, posterior; (C) distal seta of pereopod 1 carpopropodus segment 2; (D) distolateral seta of pereopod 1 carpopropodus segment 1; (E) posterolateral seta of pereopod 1 carpopropodus segment 1; (F) pereopod 3. Scales (mm): A, F = 0.5; B = 1; C−E = 0.25.

Figure 9. Heteromysis (Heteromysis) macropsis, female, 4 mm, AM P.98707. (A) head, dorsal; (B) habitus, lateral; (C) posterior part of body (abdominal somite 6, telson, uropods), dorsal; (D) telson posterior part; (E) uropodal endopod, ventral; (F) distomedial setae of antennular segment 3, dorsal; (G) antenna 2 and interocular process, ventral. Scales (mm): A−C = 1; D, F = 0.25; E, G = 0.5.

Figure 10. Heteromysis (Heteromysis) macropsis, female, 4 mm, AM P.98707. (A) mandibular palp, medial; (B) labrum, ventral; (C) maxilla 1, posterior; (D) maxilla 2, posterior; (E) maxilliped 2 endopod, anterior; (F) pereopod 1 endopod, anterior; (G) distal part of pereopod 1 endopod, anterior; (H) pereopod 2 endopod, anterior; (I) distal part of pereopod 2 endopod, anterior. Scales (mm): A−F, H = 0.5; G, I = 0.25.

Figure 13. Heteromysis (Heteromysis) tasmanica, female, 6 mm, AM P.36618. (A) habitus, lateral; (B), head, dorsal; (C) posterior part of body (abdominal somite 6, telson, uropods), dorsal; (D) telson posterior part; (E) uropodal endopod, ventral. Scales (mm): A−C = 1; D = 0.25; E = 0.5.

Figure 14. Heteromysis (Heteromysis) tasmanica, female, 6 mm, AM P.36618. (A) mandibular palp, medial; (B) labrum, ventral; (C) mandible, left; (D) maxilla 1, anterior; (E) maxilla 2, anterior; (F) maxilliped 1 endopod, posterior; (G) maxilliped 2 endopod, anterior; (H) pereopod 1 endopod, anterior; (I) distal seta of pereopod 1 carpopropodus segment 2; (J) distal cuspidate setae of pereopod 1 carpopropodus segment 1. Scales (mm): A, E−H = 0.5; B−D, I = 0.25; J = 0.1.

Figure 18. Heteromysis (Olivemysis) abrucei Băcescu, 1979, male, Tasman Sea, New South Wales, Port Kembla,AM P.63480. (A) head, dorsal; (B) posterior part of body with telson and uropods, dorsal; (C) posteroventral margin of abdominal segment 6, and uropodal protopod; (D) uropodal endopod, ventral; (E) antennal peduncle and scale, ventral view; (F) mandibular palp, anterior; (G) maxilla 1, anterior; (H), maxilla 2, posterior. Scales (mm): A, B = 1; C−H = 0.5.

Figure 19. Heteromysis (Olivemysis) abrucei Băcescu, 1979, male, Tasman Sea, New South Wales, Port Kembla, AM P.63480. (A) maxilliped 1, anterior; (B) maxilliped 2 endopod, posterior; (C) pereopod 1 endopod, posterior; (D) distolateral spiniform setae (one side) of pereopod 1 carpopropodus segment 1, posterior. Scales (mm): A−C = 0.5; D = 0.25.

Figure 23. Heteromysis (Olivemysis) murrayae sp. nov., holotype, female, 7 mm, AM P.98685. (A) head, dorsal; (B) posterior part of body with telson and uropods, dorsal; (C) posteroventral margin of abdominal segment 6, and uropodal protopod; (D) uropodal endopod, ventral; (E) antennal peduncle and scale, ventral view; (F) mandibular palp, posterior; (G) mandibular palp segment 3, posterior; (H) labrum, ventral; (I) maxilla 1, posterior. Scales (mm): A, B = 1; C−F, H = 0.5; G, I = 0.25.

Figure 24. Heteromysis (Olivemysis) murrayae sp. nov. (A−F) holotype, female, 7 mm, AM P.98685; (G) paratype, female, 7 mm, New South Wales, Forster, AM P.98687. (A) maxilla 2, posterior; (B) maxilliped 1 endopod, posterior; (C) maxilliped 2 endopod, posterior; (D) pereopod 1, posterior; (E) distolateral spiniform setae of pereopod 1 carpopropodus segment 1, posterior; (F) pereopod 2 endopod, posterior; (G) pereopod 2 endopod, posterior. Scales (mm): A, C, D, F, G = 0.5; B, E = 0.25.