Cyclaspoides longimerus Mühlenhardt-Siegel, 2005

Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, Zootaxa 3815 (3), pp. 301-341 : 303-304

Cyclaspoides longimerus Mühlenhardt-Siegel, 2005

( Figures 1 –3)

Material. DIVA II, EBS #89-S: 1 ovigerous female ZMH: K-43910. DIVA II, EBS #90-E: 1 manca ZMH: K-43911. BIOZAIRE 3 KGS #70: 1 subadult male with 5 developing pleopods (slightly damaged, dissected) MNHN-IU-2012- 1348. BIOZAIRE, 3 KGS #76: 1 subadult female (in bad condition) MNHN-IU-2012-1349. BIOZAIRE 3, KGS #78: 1 non-ovigerous female ( Fig. 1 ) MNHN-IU-2012-1350. BIOZAIRE 3, KGS #83: 1 manca MNHN-IU-2012-1351.

Description. Subadult male (MNHN-IU-2012-1348)

Antenna 1 ( Fig. 2 , A1): relative length of peduncle articles 1 to 3: 35/23/42.

Maxilliped 1 ( Fig. 2 , Mxp1): B/R ratio not given, basis broken during dissection, relative length of articles I to D: 0/17/ 50/22/11.

Maxilliped 2 ( Fig. 2 , Mxp2): B/R ratio 0.9, relative length of articles I to D: 9/20/35 /21/15.

Maxilliped 3 ( Fig. 2 , Mxp3): B/R ratio 1.5, relative length of articles I to D: 12/37/26 /20/5.

Pereiopod 1 ( Fig. 2 P1): B/R ratio 0.9, relative length of articles I to D: 12/17/33 /24/14.

Pereiopod 2Fig. 3, P2): B/R ratio 1.0, relative length of articles I to D: 5/28/23 /19/25.

Pereiopod 3 (Fig. 3, P3): B/R ratio 0.9, relative length of articles I to D: 21/26/ 27/15/11.

Pereiopod 4 (Fig. 3, P4): B/R ratio 1.0, relative length of articles I to D: 16/33/ 26/15/10.

Pereiopod 5 (Fig. 3, P5): B/R ratio 0.7, relative length of articles I to D: 13/23/28/18/18.

Pleotelson (Fig. 3, U): 3.3 times longer than wide.

Uropod (Fig. 3, U): peduncle 0.3 times as long as pleotelson; exopod 1.2 times longer than endopod; endopod 1.1 times as long as peduncle.

Distribution. Angola and Guinea Basins, 3139–5390 m depth.

Remarks. The specimens in the present collection are determined as C. longimerus as the uropod endopod is unarticulated and shorter than the exopod. The carapace is elevated posterior to the ocular lobe and the habitus differs slightly from that of the ovigerous female holotype. However, in this case the proportions seem to be influenced by the big brood pouch in the holotype. No ornamentation or ridge is present on the carapace, the pseudorostral lobes are 0.2 times as long as the rest of carapace and meet in front of the ocular lobe. The antennal notch is small, rounded, the anterolateral tooth is slightly protruding, and the anteroventral margin of carapace is serrated. The white integument is slightly translucent, with honeycomb-like structure in higher magnification. The first three thoracic segments are fused to the overlapping carapace, the first visible segment is the shortest, the coiled gut is visible. The pleon is 1.1 times as long as the carapace and the free thoracic segments combined. At least in the anterior segments, the pleon outline appears serrated in higher magnification due to the scaly structure. The pleotelson is elongate and 2.9 times as long as the uropod peduncle.

The long merus of the pereiopod 2 is present as well as the unsegmented uropod endopod, being shorter than the exopod, as described for C. longimerus . In the subadult female with developing oostegites, the merus of pereiopod 2 is even longer than the dactylus, most probably due to the younger developmental stage compared to the ovigerous female type specimens in Mühlenhardt-Siegel (2005a).

Figures

FIGURE 1. Cyclaspoides longimerus, non-ovigerous female; habitus; Biozaire 3, MNHN-IU- 2012 - 1350; scale bar: 1 mm.

FIGURE 2. Cyclaspoides longimerus, male; A 1: antenna 1; Mxp 1: maxilliped 1; Mxp 2: maxilliped 2; Mxp 3: maxilliped 3; P 1: pereiopod 1; scale bars: 0.1 mm (A 1, Mxp 1, Mxp 2, Mxp 3) and 0.5 mm (P 1).