Makrokylindrus (Makrokylindrus) meteorae Mühlenhardt-Siegel, 2005e

Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, Zootaxa 3815 (3), pp. 301-341 : 317-320

Makrokylindrus (Makrokylindrus) meteorae Mühlenhardt-Siegel, 2005e

( Figures 11–16 )

Material. DIVA II, EBS #63-S: 2 non-ovigerous females ZMH: K 43919 ; DIVA II, EBS #89-S: 2 non-ovigerous females (1 dissected) ZMH: K 43920 ; DIVA II, EBS #89-S: 2 damaged mancas (1 dissected) ZMH: K-43921.

Description. Non-ovigerous female (ZMH: K 43920 )

Antenna 1 ( Fig. 11 , A1): relative length of peduncle articles 1 to 3: 38/37/25; article 1 with strong tooth distally, combs of hair-like setae, a short, terminally pappose seta, a handlike seta, and a long pappose seta; article 2 with nine simple setae; article 3 with two broken setae distally; accessory and main flagellum broken off.

Maxilliped 2 ( Fig. 11 , Mxp2): B/R ratio 0.7, relative length of articles I to D: 9/21/34 /22/13; basis with fringe of hair-like setae along outer margin, three combs of hair-like setae and five pappose setae distally; merus with combs of hair-like setae and one simple and one pappose seta; carpus with a fringe of hair-like setae and five pappose setae; propodus with five pappose setae; dactylus with one stout and two slender simple setae, one micropappose seta terminally.

Maxilliped 3 ( Fig. 11 , Mxp3): B/R ratio 1.1, relative length of articles I to D: 10/17/24 /26/23; basis dilated distally, with a row of four teeth along inner distal margin, four pappose setae distally; ischium with one tooth and a pappose seta; merus with one large tooth and three pappose setae; carpus with one tooth and four pappose setae; propodus with five pappose setae; dactylus with one strong terminal and four slender sub terminal setae: exopod present.

Pereiopod 1 ( Fig. 11 , P1): broken behind basis; basis with numerous teeth, fringe of hair-like setae, and three pappose setae; slender exopod present.

Pereiopod 2 ( Fig. 11 , P2): B/R ratio 0.7, relative length of articles I to D: 5/ 31/18/11 /34; basis with eight teeth and two pappose setae; long merus with a tooth and three simple setae; carpus with two distal teeth and one simple seta; propodus with two distal teeth; dactylus with three simple setae and two broken, probably simple setae; slender exopod present.

Pereiopod 3 ( Fig. 12 , P3): B/R ratio 0.6, relative length of articles I to D: 10/50/18 /11/11; basis with a short simple and a longer pappose seta; ischium with a simple seta; long merus with four simple setae; carpus with three simple and three terminally annulated setae; propodus with one terminally annulated seta; dactylus with one strong terminal and two thinner simple setae sub terminally; exopod rudimentary.

Pereiopod 4 ( Fig. 12 , P4): B/R ratio 0.6, relative length of articles I to D: 8/ 46/23/12 /11; basis with a simple seta; long merus with three simple setae; carpus with a simple and five terminally annulated setae; propodus with one terminally annulated setae; dactylus with a strong terminal and a thin sub terminal simple seta; rudimentary exopod present.

Pereiopod 5 ( Fig. 12 , P5): B/R ratio 0.7, relative length of articles I to D: 9/30/ 35/14/12; dactylus with a long (broken) and a thin sub terminal seta.

Uropod ( Fig. 12 , U), peduncle slightly shorter than telson, 1.9 times as long as endopod; exopod equal in length to endopod; tri-articulated endopod with three cuspidate setae along inner margin of basal article, distal articles with two cuspidate setae each.

Manca, damaged specimen (ZMH: K-43921; Figure 14 ).

Antenna 1 ( Fig. 15 , A1): relative length of peduncle articles 1 to 3: 33/37/30.

Maxilliped 2 ( Fig. 15 , Mxp2): B/R ratio 0.6, relative length of articles I to D: 8/24/29 /25/14;

Maxilliped 3 ( Fig. 15 , Mxp3): B/R ratio not given, basis broken during dissection, relative length of articles I to D: 8/16/28 /26/22; strong teeth at distal part of basis, ischium and merus.

Pereiopod 1 ( Fig. 15 , P1): B/R ratio 0.5, relative length of articles I to D: 5/ 10/28/36 /21; strong tooth at distal part of basis.

Pereiopod 2 ( Fig. 15 , P2): B/R ratio 0.8, relative length of articles I to D: 7/30/18 /13/31; strong tooth at distal part of ischium, merus and carpus.

Pereiopod 3 ( Fig. 16 , P3): B/R ratio 0.7, relative length of articles I to D: 20/ 46/20/9 /4.

Pereiopod 4 ( Fig. 16 , P4): B/R ratio 0.7, relative length of articles I to D: 10/46/19 /14/10.

Pereiopod 5: not yet developed.

Uropod ( Fig. 16 , U): peduncle as long as preanal part of telson, 1.7 times longer than endopod; exopod as long as endopod; endopod tri-articulated, the basal article with three cuspidate setae along inner margin, longer than the two distal articles combined.

Telson longer than uropod peduncle, no lateral setae at postanal part.

Distribution. Angola and Guinea Basins, 5047 – 5415 m depth.

Remarks. The specimens from the Guinea Basin are similar to the ones described for the Angola Basin with the carapace bearing many spines, a pair of anteriorly directed teeth at the pseudorostrum, the telson longer than the uropod peduncle, and two pairs of lateral setae at the postanal part of the telson. However, the females from the Guinea Basin have more spines at the carapace and the teeth at maxilliped 3 are larger than in the male holotype from the Angola Basin. Apart from that, the specimens are very much similar.

The ventral part of pereionite 3 has a pair of spines ( Figure 13 ) in the Guinea Basin female specimens. Unfortunately, this part of the sternite is destroyed in the male holotype.

The carapace surface of the two mancas is smooth with small dimples, one to two spines close to the anterior part of the frontal lobe, and a pair of anteriorly directed spines on the pseudorostral lobes. The telson is longer than the uropod peduncle and there are no lateral setae at the postanal margin, maybe the lateral setae are not yet developed due to the young stage of the specimens. The extremities do have a long and strong tooth at the distal margins of the basis, which are also present in the subadult male holotype, although not as strong as in the specimen from the Guinea Basin.

Figures

FIGURE 11. Makrokylindrus (M.) meteorae, subadult female; A 1: antenna 1; Mxp 2: maxilliped 2; Mxp 3: maxilliped 3; P 1: basis of pereiopod 1; P 2: pereiopod 2; scale bars: 0.1 mm (Mxp 2) and 0.5 mm (A 1, Mxp 3, P 1, P 2).

FIGURE 12. Makrokylindrus (M.) meteorae, subadult female; P 3: pereiopod 3; P 4: pereiopod 4; P 5: pereiopod 5; U: pleonite 6, telson and left uropod; scale bars: 0.5 mm.

FIGURE 13. Makrokylindrus (M.) meteorae, subadult female; ventral part of pereionite 3 to 5 in lateral view and higher magnification; scale bar: 0.5 mm.

FIGURE 14. Makrokylindrus (M.) meteorae, damaged mancas (# 89); habitus, above: lateral view at left side; below: second manca (dissected) lateral view of right side, scale bar: 1 mm.

FIGURE 15. Makrokylindrus (M.) meteorae, damaged manca, A 1: antenna 1; Mxp 2: maxilliped 2; Mxp 3: maxilliped 3; P 1: pereiopod 1; P 2: pereiopod 2; scale bars: 0.1 mm (Mxp 2, Mxp 3) and 0.5 mm (A 1, P 1, P 2).

FIGURE 16. Makrokylindrus (M.) meteorae, damaged manca; P 3: pereiopod 3; P 4: pereiopod 4; U: pleonite 6, telson and right uropod; scale bars: 0.5 mm.