Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Scolecitrichidae ( Family )
            Rythabis ( Genus )
Rythabis asymmetrica  Markhaseva & Schulz, 2007   (F)
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
Antarct. (Scotia Sea)
N: 1
(969) F: 1,28; 1,35; {F: 1,28-1,35}
Rem.: hyperbenthic; bathypelagic (2258-2281 m).
Last update : 12/07/2013
    to add your remark

 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed January 27, 2023]

© copyright 2005-2023 Sorbonne University, CNRS

CNRS   Observatoire Océanologique de Banyuls sur Mer - Laboratoire Arago
Sorbonne Université


Version française
English version



On the WEB of CNRS


Marine Planktonic Copepods

Marine Planktonic Copepods


Imprimer Contact Accueil Plan du site Accès restreint Retour Une du Labo Imprimer Contact Plan du site Crédits Téléchargez les Plug-Ins