Macrostylis gerdesi (Brandt, 2002)

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 : 190

Macrostylis gerdesi (Brandt, 2002)

urn:lsid:zoobank.org:act: DE 164C85-4733-40E3-9721-975940A24F95 Desmostylis gerdesi Brandt, 2002 ; pp. 618–626, Figs 1–4 ;

Macrostylis gerdesi (Brandt, 2002) .—Riehl & Brandt, 2010; pp. 43–44; Fig.19 .

Type fixation. Holotype: non-ovigerous female, 1.8 mm length, ZMH K-39915, by original designation.

Type locality. Antarctica, Southern Ocean, Weddell Sea, off Kapp Norvegia: multiple box corer, station 0 37, 28.2.1996, 71° 31.90’S, 13° 31.20’W; 238 m depth.

Type material. Holotype: non-ovigerous female, 1.8 mm length, ZMH K-39915, dissected; paratype :: nonovigerous female, 1.6 mm length, ZMH K-39916, from type locality.

Type material - Remarks. The holotype carcass got all limbs removed and is strongly damaged. The slides with appendages are in good condition.

Modified diagnosis. Pereonite 3 ventral spine small. Pereonite 4 width subequal pereonite 5 width, posterolateral margins not produced posteriorly, ventral spine absent. Pereonite 6 length shorter pereonite 5 length. Pereonite 7 ventral spine prominent. Pleotelson subrectangular, waist absent, posterior apex convex. Pereopod III ischium dorsal lobe triangular. Pereopod V ischium dorsally with no seta.

Figures

FIGURE 1. Type localities of Macrostylidae from the Southern Ocean. 1) Macrostylis antennamagna Riehl & Brandt, 2010. 2) M. setulosa Mezhov, 1992. 3) M. uniformis Riehl & Brandt, 2010. 4) M. vinogradovae Mezhov, 1992. 5) M. cerrita Ve y & Brix, 2009. 6) M. gerdesi (Brandt, 2002). 7) M. sarsi Brandt, 1992; M. obscura (Brandt, 1992). 8) M. matildae n. sp.; M. scotti n. sp. 9) M. roaldi Riehl & Kaiser, 2012.

FIGURE 2. Macrostylis scotti n. sp. A – E, holotype adult male (ZMH K- 42990), with ciliate epibionts, photoplate. A, dorsal habitus. B, ventral fossosoma. C, ventral pleotelson. D, ventral cephalothorax. E, ciliate epibionts on right lateral margins of tergites 4 – 5. Scales: A = 0.5 mm, B – D = 0.2 mm, E = 0.1 mm.

FIGURE 3. Macrostylis scotti n. sp. A – E, holotype adult male (ZMH K- 42990), with ciliate epibionts. A, lateral habitus, ornamentation omitted, setae simplified, uropods partially omitted. B, dorsal habitus, ornamentation omitted, setae simplified, areas free of imbricate ornamentation indicated by thin dashed lines on pereonites 6 – 7. C, pereopod III, ischium dorsal apex proximal prominent seta damaged. D, ciliate epibiont. E, ventral pleotelson, left setal ridge and ventral setation on left pleopod II omitted. Scales: A, B, E = 0.5 mm, C = 0.3 mm, D = 0.1 mm.

FIGURE 4. Macrostylis scotti n. sp. A – H, paratype non-ovigerous female (ZMH K- 42992). A, dorsal habitus, impricate ornamentation (IO) omitted. B, antennula and antenna, in situ. C, ventral pleotelson, IO omitted. D, lateral habitus, IO omitted, setae simplified. E, ventral pleopod V. F, ventral pleopod IV. G, ventral pleopod III. H, ventral pleopod II (operculum). Scales: A, C, D = 0.5 mm, B = 0.2 mm, E – H = 0.3 mm.

FIGURE 19. Macrostylis matildae n. sp. A – C, paratype adult male (ZMH K- 43004). A, pereopod V, cuticular setules omitted. B, pereopod V dactylus, enlarged. C, pereopod VI, cuticular setules illustrated. D, pereopod VII, cuticular setules omitted, twisted at carpo-propodal articulation. Scale: A, C, D = 0.2 mm.