Macrostylis antennamagna Riehl & Brandt, 2010

Riehl, Torben & Brandt, Angelika, 2013, Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise, Zootaxa 3692 (1), pp. 160-203 : 189

Macrostylis antennamagna Riehl & Brandt, 2010

urn:lsid:zoobank.org:act:5B09C3B7-6291-458D-BC5E-975BCBD39D80 Macrostylis antennamagna Riehl & Brandt, 2010 ; pp. 29–43; Figs 9–18 .

Modified diagnosis. Body hirsute. Female pleotelson narrowing evenly towards uropod insertions, lateral margins straight, posterior apex slightly concave, posterior apex length 0.15 pleotelson length. Male pleotelson of hourglass-like shape, posterior apex clearly concave. Female pereonite 4 posterolateral margins produced posteriorly, rounded. Male pereonite 4 posterolateral margins not produced posteriorly. Female pereonite 6 shorter pereonite 5, vice versa in male. Female pereonite 3–4 ventral spines present, small, both absent in male. Female and male pereonite 7 ventral spine small. Pereopod III ischium dorsal lobe triangular.

Figures

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 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.

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 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 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 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 15. Macrostylis matildae n. sp. A – D, paratype non-ovigerous female (ZMH K- 43003). A, pereopod I. B, pereopod II, cuticular setules omitted. C, pereopod III, cuticular setules omitted, propodus and dactylus twisted 45 °. D, pereopod IV, cuticular setules omitted. Scale: A – D = 0.2 mm.

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. 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 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.