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FIGURE 8. Macrostylis papillata n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 8. Macrostylis papillata n. sp. A, E, paratype juvenile Ψ (AM P86008). B–C, F–G, paratype adult, non-ovigerous Ψ (AM P860010). D, H, holotype ovigerous Ψ (AM P86009). A–D, dorsal and lateral habitus, cuticle ornamentation and appendages mostly omitted, uropods missing where not illustrated. D, uropod endopod, damaged. E–F, left antennula and antenna, in situ, lateral. G, pleotelson, ventral. H, uropod, close-up, endopod damaged. Scales: A–D = 0.5 mm, E–F = 0.1 mm, G = 0.3 mm.

FIGURE 6. Macrostylis dorsaetosa n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 6. Macrostylis dorsaetosa n. sp. A–H, paratype juvenile ɗ (AM P86005). A, cephalothorax, dorsal. B, antennula close-up, dorsal. C, pereonites 5–6, dorsal. D, habitus, lateral. E, cephalothorax close-up, lateral. F, pereopod I, lateral. G, pereopod III, lateral. H, posterior apex of pleotelson and uropods, dorsal. Scales: A–B, F–H = 0.1 mm, D = 1 mm.

FIGURE 5. Macrostylis dorsaetosa n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 5. Macrostylis dorsaetosa n. sp. A–B, paratype terminal ɗ (P86004). C–F, paratype terminal ɗ (AM P86003). A, close-up of pleopods I, ventral. B, pleotelson, ventral. C, left pleopod II, ventral. D–F, right pleopods III–V, d o r s a l. Scales: A, C–F = 0.1 mm, B = 0.5 mm.

FIGURE 1. Macrostylis dorsaetosa n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 1. Macrostylis dorsaetosa n. sp. A–E, holotype Ψ (AM P86000). A, dorsal habitus, imbricate ornamentation and fine setation omitted. B, left pereopod III ischium, close-up. C, pleotelson, ventral. D, right uropod, close-up. E, lateral habitus. Scales: A, D–E = 1 mm, B–C = 0.5 mm.

FIGURE 4. Macrostylis dorsaetosa n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 4. Macrostylis dorsaetosa n. sp. A–E, paratype Ψ (AM P86002). A, pereopod IV, posterior. B, pereopod V, lateral. C, pereopod VI, lateral. D, pereopod VII, lateral. E, operculum, ventral. Scales = 0.2 mm.

FIGURE 3. Macrostylis dorsaetosa n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 3. Macrostylis dorsaetosa n. sp. A–C, paratype Ψ (AM P86002). A, pereopod I, lateral, close-up of split and monoserrate seta. B, pereopod II, lateral. C, pereopod III, lateral. Scale = 0.3 mm.

FIGURE 2. Macrostylis dorsaetosa n in New Macrostylidae Hansen, 1916 (Crustacea: Isopoda) from the Gay Head-Bermuda transect with special consideration of sexual dimorphism

FIGURE 2. Macrostylis dorsaetosa n. sp. A–C, E, N, paratype adult (non-ovigerous) Ψ (AM P86002). M, paratype juvenile Ψ (AM P86006). D, F–G, K, paratype terminal ɗ (AM P86003). L, paratype juvenile ɗ (AM P86005). A, left mandible, medial view of incisor process and lacinia mobilis. B, left mandible, dorsal. C, right mandible, dorsal. D, right mandible, incisor process and lacinia mobilis, medial view. E, paragnaths, ventral view, ventral setae omitted in right lateral lobe, all setae omitted in left medial lobe, dorsal setae omitted in left lateral lobe. F, right maxillula, dorsal. G, left maxilla, ventral. H, left maxilliped, endite setation, ventral. I, left maxilliped, ventral. J, right maxilliped, endite setation, dorsal. K right antennula, lateral. L left antennula and antenna, lateral. M, right antennula and antenna, lateral. N, right antennula and antenna, lateral. Scales: A–J = 0.05 mm, K–N = 0.1 mm.

FIGURE 22 in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 22. Illustrations for identification key to the Macrostylidae of the Southern Ocean. A, pleotelson of Macrostylis cerrita Vey & Brix, 2009, dorsal view, evenly narrowing towards uropodal insertions, lateral margins straight, waist absent. B, pleotelson of M. matildae n. sp., dorsal view, evenly narrowing towards uropodal insertions, lateral margins straight, waist present. C, pleotelson of M. gerdesi (Brandt, 2002), dorsal view, lateral margins straight, subparallel. D, pleotelson of Macrostylis setulosa Mezhov, 1992, lateral margins convex, waist present. E, pleotelson of M. antennamagna Riehl & Brandt, 2010, dorsal view, lateral margins convex, waist present, posterior apex concave. F, ventral spines of M. matildae with pereonites 3 and 4 spines present, pereonite 7 spine small. G, ventral spines of M. roaldi Riehl & Kaiser (2012) with pereonites 3 and 4 spines present, pereonite 7 spine prominent. H, ventral spines of M. scotti n. sp. with pereonites 3 and 4 spines absent, pereonite 7 spine small. I, M. matildae pereonite 3 posterolateral margin spine-like setae absent, pereonite 4 lateral margin curved, posterolateral margin produced posteriorly, rounded, spine-like setae present. J, M. scotti pereonite 3 posterolateral margin spine-like setae absent, pereonite 4 lateral margin convex, posterolateral margin not produced posteriorly, rounded, spine-like setae absent. K, M. roaldi pereonite 3 posterolateral margin spine-like setae present, pereonite 4 lateral margin curved, posterolateral margin produced posteriorly, pointed, spine-like setae present. L, M. matildae operculum, elongate, distally tapering, with lateral fringe of setae distinctly separate from apical row of pappose setae. M, M. scotti operculum, elongate, ovoid, with fluent transition between lateral fringe of setae and apical row of pappose setae. N, M. roaldi operculum, stout, ovoid, with lateral fringe of setae distinctly separate from apical row of pappose setae. O, M. cerrita pereopod III ischium with tapering dorsal apex and 1 spine-like prominent seta. P, M. roaldi pereopod III ischium with triangular dorsal apex and 1 prominent spine-like seta. Q, M. scotti pereopod III ischium with dorsal apex tapering and 2 prominent, spine-like setae.

FIGURE 18. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 18. Macrostylis matildae n. sp. A–E, paratype adult male (ZMH K-43004). A, pereopod I, cuticular setules omitted. B, pereopod I dactylus, double size. C, pereopod II. D, pereopod III, cuticular setules omitted. E, pereopod III dactylus, double size. F, pereopod IV, cuticular setules omitted. G, pereopod IV dactylus enlarged. Scales: A,C,D,F = 0.2 mm, E = 0.05 mm.

FIGURE 21. Macrostylis sarsi Brandt, 1992 A–H in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 21. Macrostylis sarsi Brandt, 1992 A–H, holotype non-ovigerous female (BM(NH)1990-40-1). A, pereopod I. B,pereopod VI. C, pereopod VII. D, operculum, apex damaged. E, antenna. F, antennula. G, right mandible, ventral. H, left mandible, ventral. Scale: A–C = 0.2 mm; D–H = 0.1 mm.

FIGURE 16. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 16. Macrostylis matildae n. sp. A–C, paratype non-ovigerous female (ZMH K-43003). A, pereopod V, cuticular setules omitted. B, pereopod VI, cuticular setules omitted. C, pereopod VII, cuticular setules omitted. Scale: A–C = 0.2 mm.

FIGURE 17. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 17. Macrostylis matildae n. sp. A–I, paratype adult male (ZMH K-43004). A, habitus, lateral, antenna broken, pereopods dissected, cuticular setules and imbricate ornamentation (IO) omitted. B, habitus, dorsal, cuticular setules and IO omitted, pleotelson damaged, left uropod omitted, antennae broken. C, pleotelson, ventral, setae and cuticular setules omitted. D, antennule and antenna, in situ, antenna broken. E, pleopods I, cuticular setules enlarged. F, pleopod II, ventral, cuticular setules omitted. G, pleopod III. H, pleopod IV. I, pleopod V. Scales: A–C = 0.5 mm, D–I = 0.1 mm.

FIGURE 11. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 11. Macrostylis matildae n. sp. A–D, holotype non-ovigerous female (ZMH K-43000). A, habitus dorsal, cuticular setules and imbricate ornamentation (IO) omitted. B, habitus lateral, cuticular setules, IO and uropod omitted. C, pereopod III D, pleotelson, ventral. Scale: A–D = 0.2 mm.

FIGURE 13. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 13. Macrostylis matildae n. sp. A–F, paratype non-ovigerous female (ZMH K-43003). A, habitus lateral, pereopods dissected, most setae, imbricate ornamentation (IO) and cuticular setules omitted. B, habitus, dorsal, cuticular setules, IO and right uropod setation omitted, with pleotelson tergal seta enlarged. C, operculum, ventral. D, pleopod III, dorsal, exopod setal fringe indicated by dashed line. E, pleopod IV, dorsal. F, pleopod V, dorsal. Scale: A, B = 0.5 mm, C–F = 0.1 mm.

FIGURE 12. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 12. Macrostylis matildae n. sp. A–D, paratype non-ovigerous female (ZMH K-43005), SEM photograph. A, habitus lateral. B, cephalothorax lateral with imbricate ornamentation enlarged. C, pereopod IV, merus–dactylus D, pereopod III dactylus, posterio-lateral view. Scale: A = 0.5 mm, B = 0.1 mm, C = 0.05 mm, D = 0.01 mm.

FIGURE 9. Macrostylis scotti n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 9. Macrostylis scotti n. sp. A–D, paratype adult male (ZMH K-42991). A, pereopod I. B, pereopod II. C, pereopod III. D, setae (at different rates of magnification): a, tripleserrate. b, thin, medially biserrate, distally fringe-like. c, medially biserrate, distally fringe-like, cross-section. d, medially biserrate, distally fringe-like. e, thin, long, asetulate; thin, long distally pappose. f, robust, bifurcate, fringe-like. g, bifurcate, fringe-like. h, i, bifurcate, biserrate. Scale: A–C = 0.3 mm.

FIGURE 7. Macrostylis scotti n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 7. Macrostylis scotti n. sp. A–I, paratype adult male (ZMH K-42991). A, habitus dorsal. B, habitus lateral. C, antennule and antenna, in situ. D, pleotelson, ventral. E, pleopod V, ventral. F, pleopod IV, ventral. G, pleopods I ventral. H, pleopod III, ventral. I, pleopod II, dorsal. Scales: A, B: 1.0 mm; C, E–I = 0.2 mm; D = 0.5 mm.

FIGURE 14. Macrostylis matildae n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 14. Macrostylis matildae n. sp. A–H, paratype non-ovigerous female (ZMH K-43003). A, left mandible, dorsal, molar process damaged. B, left mandible incisor process and lacinia mobilis, medial. C, right mandible incisor process and lacinia mobilis, medial. D, right mandible, dorsal, molar process damaged, lateral seta missing. E, antennula and antenna, in situ. F, maxillula, damaged. G, maxilliped, ventral. H, maxilla. Scales: A–H = 0.1 mm.

FIGURE 5. Macrostylis scotti n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 5. Macrostylis scotti n. sp. A–C, paratype non-ovigerous female (ZMH K-42992). A, pereopod II. B, pereopod IV. C, pereopod III. Scale: A–C = 0.3 mm.

FIGURE 10. Macrostylis scotti n in Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise

FIGURE 10. Macrostylis scotti n. sp. A–D, paratype adult male (ZMH K-42991). A, pereopod IV. B, pereopod V. C, pereopod VI D, pereopod VII. Scale: A–D = 0.3 mm.