Macrostylis meteorae , Brandt, Angelika, 2004

Brandt, Angelika, 2004, New deep­sea species of Macrostylidae (Asellota: Isopoda: Malacostraca) from the Angola Basin off Namibia, South West Africa, Zootaxa 448, pp. 1-35: 21-25

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Macrostylis meteorae

sp. nov.

Macrostylis meteorae  sp. nov. ( Figs 12–13View FIGURE 12View FIGURE 13)

Holotype: Ovig. Ψ (2.2 mm), Angola Basin, South Atlantic, 16 ° 18.1 ’S 005° 27.2 ’E – 16 ° 19.3 ’S 005° 27.2 ’E, 28 July 2000, ZMHAbout ZMH K­ 40282; EBS, station 348, 5387– 5390m.

Paratypes: Ovig. 2 Ψ (2.2, 2.5 mm), ZMHAbout ZMH K­ 40283; EBS, station 348, station data as for holotype. 1 Ψ (2.5 mm), 1 ovig. Ψ (2.3 mm), 16 ° 14.3 ’S 005° 26.8 ’E – 16 ° 14.9 ’S 005° 26.7 ’E, 29 July 2000, ZMHAbout ZMH K­ 40698, EBS station 350, 5389 m.

Distribution: Only known from Angola Basin, 5387–5390 m.

Etymology: Named after the research vessel “Meteor” from which the species was collected.

Diagnosis: Head sub­quadrate, 1.2 as long as wide, female operculum trapezoidal.

Description: Female (holotype) body ( Fig. 12View FIGURE 12) 3 times as long as wide; body dorsum and margins smooth, without setae, few setules caudally on pleotelson. Head sub­quadrate, 1.2 as wide as long, without dorsal spines or any sculpture. Pleotelson 1.4 as long as wide, of quadrangular shape, caudally slightly convex. Pereonites 5 and 6 longest, pereonites 1– 3 shortest. Uropods 1.7 pleotelson length.

A 1 ( Fig. 12View FIGURE 12): less than 0.1 as long as body, of 5 articles. Article 1 longest, with 1 simple seta. Article 2 0.25 as long as first, with 2 broom setae, articles 3 to 5 decreasing in length and width, last article with 1 aesthetasc and 1 simple seta.

A 2 ( Fig. 12View FIGURE 12, dorsal view): 0.2 as long as body, with 5 peduncular and 6 flagellar articles. Peduncular articles 1–3 short, peduncular article 5 longest. Flagellar articles of about the same size, tip of flagellum with 3 simple setae.

LMd ( Fig. 12View FIGURE 12): Incisor with 5 teeth, lacinia mobilis 0.6 as long as incisor, bearing 3 teeth, spine row of 9 setae, pars molaris stout, tapering distally, with 8 simple setae of various lengths. Mandibular palp absent.

RMd ( Fig. 12View FIGURE 12): Similar to left, but incisor only with 3 teeth, lacinia mobilis with some branches, spine row with 12 members.

Mx 1 (not illustrated): Inner endite 0.4 as wide as outer endite. Outer endite with 11 strong spine­like setae, inner endite with 1 strong simple seta.

Mx 2 ( Fig. 12View FIGURE 12): 3 Endites, outer and medial endites most slender, with 3 long setae, medial endite with at least 8 distal setae.

Mxp ( Fig. 12View FIGURE 12): Endite reaching 0.7 of length of second palpal article, with 4 fan and several simple setae distally and 1 mediodistal simple spine­like seta, 2 medial coupling hooks. Palp length 0.5 as long as basis length. First palp article shortest, quadrangular, with 1 distomedial simple seta; article 2 broadest and longest, with 1 distodorsal simple seta and 2 distomedial ones; article 3 0.6 as wide as article 2, with 5 medial and 1 lateral simple setae, article 4 narrow, 0.3 as wide as article 3, with 2 simple distal setae, last article narrowest, as long as fourth, with 3 simple setae. Epipod 4.0 as long as wide, epipod almost as long as basis, lateral angular projection at proximal third of length, distally few short setules.

P 1 –P 4 ( Figs 12View FIGURE 12, 13View FIGURE 13): P 1–3 slightly increasing in lengths, P 4 ( Fig. 13View FIGURE 13) shortest. Bases of all pereopods longest articles, of P 1 and 2 with 4 broom setae, of P 2 with 9, of P 3 with 3 and P 4 with 5 broom setae, few simple setae, ischia about 0.5–0.7 basis length with varying numbers of sensory setae on both margins, P 3 with 5 long ones distodorsally. Meri slightly shorter than ischia, in P 1 and P 2, in P 3 and P 4 of same length, with long sensory setae, especially distodorsally, on P 3 with row of 6 long sensory setae distodorsally on merus. Carpi slightly longer than meri in P 2 and P 4, in P 1 and P 3 as long as meri, with sensory setae on both sides, on P 2 and P 3 especially on dorsal side, 1 distodorsal broom seta on P 2 and P 4. Propodi 0.4–0.6 as long as carpi, with few setae. Dactyli with 2 claws.

P 5 and P 6 ( Figs 13View FIGURE 13) (P 6 broken off in this specimen): Long and slender, basis longest article, with 5 broom setae and 2 simple setae in P 5, in P 7 with 15 long whip setae and 5 ventral simple ones. Ischium of P 5 and P 7 0.8 as long as basis, with 3 (P 7 with 6) sensory setae. Merus 0.8 as long as ischium, with 5 sensory setae in P 5, in P 7 with 4 ventral ones and 5 distodorsal sensory setae. Carpus longer than merus and propodus, with 5 sensory setae in P 5 and seven in P 7, and 1 broom seta distodorsally in P 5. Propodus of P 5 with 5 sensory setae on both sides, P 7 only 3 setae, but ventral setae being very long, 1 distodorsal broom seta. Dactylus shorter than propodus, with 2 long claws of different lengths, in P 7 distally serrated.

Plp 2 ( Fig. 13View FIGURE 13): Elongate, trapezoidal, broadest medially, with 10–12 proximolateral whip setae, 3 mesiolateral setae and few dorsal setules, distally with 11 plumose setae.

Plp 3 ( Fig. 13View FIGURE 13): Endopod much longer than wide, almost rectangular, with 4 distal plumose setae, exopod almost as long as endopod, laterally and distomedially with small setules.

Plp 4 ( Fig. 13View FIGURE 13): Endopod almost quadrangular, bare, twice as long as wide, exopod 0.6 as long as endopod, distally with 1 long plumose seta.

Pleopod 5 (Fig. 24) only 1 small oval lobe.

Urp ( Fig. 13View FIGURE 13) Sympod 2.5 times as long as ramus, with 3 broom, 1 plumose and 4 simple setae, ramus with 7 broom setae of different lengths and 2 long simple setae.

Remarks. Macrostylis meteorae  sp. nov. is similar to M. hirsuticaudis Menzies, 1962  , but the antennule of the new species is smaller and possesses only one aesthetasc, the head is narrower than in M. hirsuticaudis  and the ischium of pereopod 3 possesses five dorsal sensory setae in M. meteorae  in contrast to seven setae in M. hirsuticaudis  . Moreover, the female operculum of M. meteorae  is almost trapezoidal, a character state not reported for any other species of Macrostylis  . Serrate dactylar claws are also present in M. longispinis  sp. nov., but that species can easily be distinguished by the long, caudally directed ventral spine on pereonite 7.


Zoologisches Museum Hamburg