Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Scolecitrichidae ( Family )
            Rythabis ( Genus )
Rythabis asymmetrica  Markhaseva & Schulz, 2007   (F)
Ref.:
Markhaseva & Schulz, 2007 (p.737, figs.F)
Species Rythabis asymmetrica - Plate 1 of morphological figuresissued from : E.L. Markhaseva & K. Schulz in J. Nat. Hist., 2007, 41 (13-16). [p.738, Fig.4]
Female (from 58°24'S, 25°01'E): A-B, habitus (lateral and dorsal, respectively); C, forehead (lateral); D-E, posterior prosome and urosome (dorsal and lateral, respectively); F-G, posterior prosome and genital double-somite (right and left lateral, respectively); H, genital double-somite (right lateral).
Scale bars: 0.1 mm.
Holotype: C, D, F, G. Paratype: A, B, E, H.

Nota : Prosome 3.0-3.4 times longer than urosome. Cephalosome and pediger 1 incompletely separate ; 4th and 5th incompletely separate. Posterior corners of prosome rounded, asymmetrical, right one shorter. Genital double-somite nearly symmetrical ; spermathecae elongate, in distal half frontally directed. Caudal rami with 4 terminal setae, 1 small dorsal seta, ventral seta apparently missing.


Species Rythabis asymmetrica - Plate 2 of morphological figuresissued from : E.L. Markhaseva & K. Schulz in J. Nat. Hist., 2007, 41 (13-16). [p.739, Fig.5]
Female: A, A1; B, A2 (endopod segment 2 omitted); C, A2 (endopod segment 2); D, Md (mandibular palp); E, Md (endopod); F, Md (gnathobase); G, Md masticatory edge); H, Mx1; I, P5 (posterior).
Scale bars: 0.1 mm.

Nota : A2 exopod 7-segmented (2.5 times as long as endopod), with 0, 1, 1, 1, 1, 1, 3 setae ; endopod segment 1 with 2 setae, 2nd with 7 and 6 setae. Md gnathobase with 5 large and 3 small teeth, 1 seta and a row of spinules along cutting edge ; exopod of 5 segments with 1, 1, 1, 1, and 2 setae ; endopod segment 1 with 2 setae, segment 2 with 9 setae. Mx1 : praecoxal endite with 9 thick and 1 thin small terminal and 4 posterior setae ; coxal endite with 5 setae, coxal epipodite with 9 setae ; proximal basal endite with 4 setae, distal basal endite with 5 setae fused to endopod, endopod with 9 setae ; exopod with 4 setae. P5 uniramous, 3-segmented, coxa slightly smaller than basis, both with denticles on posterior surface medially and distally ; exopod armed with 4 spines, 1 toothed medial, 1 short lateral and 2 strong toothed spines distally.


Species Rythabis asymmetrica - Plate 3 of morphological figuresissued from : E.L. Markhaseva & K. Schulz in J. Nat. Hist., 2007, 41 (13-16). [p.740, Fig.6]
Female: A, Mx2 (praecoxal, coxal and proximal basal endites; posterior view); B, Mx2 (proximal basal endite (setae not figured) plus endopod; C, Mxp (syncoxa and basis; D, Mxp (endopod); F, P1 (anterior view); G, right endopod of P1 (anterior view).
Scale bars: 0.1 mm.

Mx2 : proximal praecoxal endite with 4 setae, distal with 3 setae ; proximal and distal coxal endites with 3 setae each ; proximal basal endite plus endopod with 6 worm-like (3 longer than others) and 2 brush-like sensory setae with distal filaments longer than setae itself. P1 : basis with curved mediodistal seta ; endopod 1-segmented with poorly developed lateral lobe, 3 medial and 2 terminal setae present, endopod with denticles along proximal lateral edge and lateral corner distally.


Species Rythabis asymmetrica - Plate 4 of morphological figuresissued from : E.L. Markhaseva & K. Schulz in J. Nat. Hist., 2007, 41 (13-16). [p.741, Fig.7]
Female: A, P2 (posterior); B, P3 (posterior); C, P4 (posterior).Scale bar: 0.1 mm.

NZ: 1

Distribution map of Rythabis asymmetrica by geographical zones
Loc:
Antarct. (Scotia Sea)
N: 1
Lg.:
(969) F: 1,28; 1,35; {F: 1,28-1,35}
Rem.: hyperbenthic; bathypelagic (2258-2281 m).
Last update : 12/07/2013
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2019. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 23, 2019]

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