Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Diaixidae ( Famille )
            Xancithrix ( Genre )
Xancithrix ohmani  Markhaseva, 2012   (F,M)
Ref.:
Markhaseva, 2012 (p.305, Descr.F, M; figs.F, M); Laakmann & al., 2019 (p.330, fig. 2, 3, 4, phylogenetic relationships)
Espèce Xancithrix ohmani - Planche 1 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.297, Fig.1]
Female: 28°01.9'S, 07°18.6'E): A-B, habitus (dorsal and lateral, respectively); C, cephalon (lateral); D, posterior prosome and urosome (dorsal); E, same (lateral), showing dorsolateral seta marked by arrow; F, cephalon anterior ventral view; G, A2; H, exopod of A2.
Scale bars = 0.5 mm (A-B); 0.1 mm remaning figures.
A, D, F: holotype; B; C, E, G, H: paratype.

Nota: Prosome 4.6-5.0 times longer than urosome.
Cephalon and pediger 1, 4th and 5th partly fused.
Rostrum reduced.
Posterior corners of prosome extends as short obtuse-triangular lobes.
Genital double-somite with spermathecae rounded dorsally.
Caudal rami with 4 terminal plus 1 ventral and 1 dorsolateral setae.


Espèce Xancithrix ohmani - Planche 2 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.298, Fig.2]
Female: A, A1, ancestral segments I-XVII; B, A1, ancestral segments XYIII-XXVIII; C, A1, ancestral segments XXVII-XXVIII (dotted line marks additions after paratype); D, Md (palp); E, Md (mandibular gnathobase); F, Md (cutting edge); G, Mx1.
Scale bars = 0.1 mm.

Nota: A1 of 24 free segments, reaching to the middle of urosome.
Gnathobase Md with 10 teeth and thick dorsal seta; basis with 3 setae; exopod 5-segmented (setal formula 1, 1, 1, 1,, 2, respectively); endopod segment 1 with 2 setae, segment 2 with 9 setae.
Mx1: praecoxal arthrite with 9 terminal, 4 posterior and 1 anterior setae; coxal endite with 5 setae, proximal basal endite with 4 setae and distal basal endite with 5 setae; endopod 3-segmented with 3, 3, 5 setae, respectively; coxal epipodite with 9 setae.


Espèce Xancithrix ohmani - Planche 3 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.299, Fig.3]
Female: A, Mx2 (praecoxal, coxal, and basal endites, proximal endopodal segment); B, endopod of Mx2 (details); C, Mx2 endopod (details of another view); D, proximal basal endite of Mx2; E, P5.
Scale bars: 0.1 mm.
A, B, D, E: holotype; C: paratype.

Mx2 praecoxal endite bearing 5 setae, coxal (former considered distal praecoxal endite) with 3 setae; basal endites (former considered coxal endites): proximal with 2 sclerotized and 1 sensory setae, distal with 3 setae (2 of them heavily spinulated); lobe of proximal endopodal segment (former considered proximal basal endite) with 2 sclerotized and 2 sensory setae; endopod with 3 long worm-like sensory, 5 brush-like sensory and 1 sclerotized setae.


Espèce Xancithrix ohmani - Planche 4 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.300, Fig.4]
Female: A, Mxp (syncoxa); B, syncoxa of Mxp (coxal endite); C, Mxp (basis and incorporated endopod segment 1); D, endopod of Mxp; E, P1.
Scale bars: 0.1 mm.
A-E holotype.


Espèce Xancithrix ohmani - Planche 5 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.301, Fig.5]
Female: A-C, P2 to P4 (posterior views)
Scale bars: 0.1 mm.
A-C: holotype.


Espèce Xancithrix ohmani - Planche 6 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.302, Fig.6]
Male: A, habitus (lateral); B, cephalon (lateral); C, rostrum (ventral); D-E, posterior prosome and urosome (dorsal and lateral, respectively); F, P5.
Scale bars: 0.1 mm.

Nota: Prosome 3.4 times longer than urosome;
Cephalon and pediger 1 partly fused, 4th and 5th completely fused.
Posterior corners of prosome extend into obtuse lobes.
Rostum rudimentary with a small terminal notch.
Anal segment very small.
Caudal rami with 4 terminal, 1 very small dorsolateral, and 1 ventral setae.
P5 asymmetrical: right coxa plus basis slightly longer than left coxa. Biramous, exopods 3-segmented; endopods rudimentary. Right terminam segment spine-like; left exopod segments 2 and 3 with spinules distally.


Espèce Xancithrix ohmani - Planche 7 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.303, Fig.7]
Male: A, right A1, ancestral segments I-XV; B, same, ancestral segments XVI-XXVIII; left A1, ancestral segments XXII_XXIII; D, exopod of A2; E, A2 (coxa, basis and endopod); F, Md (palp); G, Mx1.
Scale bars: 0.1 mm.

Nota: A1 longer thanbody; right A1 of 23 free segments.
Mouthparts armaments is rudimentary compared to female.
Md gnathobase with 9 teeth


Espèce Xancithrix ohmani - Planche 8 de figures morphologiquesIssued from : E.L. Markhaseva in Arthropodia Selecta, 2012, 21 (4). [p.304, Fig.8]
Male: A, Md (mandibular gnathobase); B, Mx2 (arrow marks sensory setae on basal endites); C, Mxp; D, P1 (arrow marks small lateral seta); E, P2.
Scale bars: 0.1 mm.

NZ: 2

Carte de distribution de Xancithrix ohmani par zones géographiques
Loc:
S Atlant. (G. of Guinea, off W South Africa)
N: 1
Lg.:
(1306) F: 4,50-4,55; M: 4,6; {F: 4,50-4,55; M: 4,6}
Rem.: Abyssopelagic. Above seabed (depth: 5053, 5141, 5058 m)
Dernière mise à jour : 02/04/2019

 Toute utilisation de ce site pour une publication sera mentionnée avec la référence suivante :

Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2024. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 12 novembre 2024]

© copyright 2005-2024 Sorbonne Université, CNRS

Webmaster
Mentions légales et informations nominatives
CNRS   Observatoire Océanologique de Banyuls sur Mer - Laboratoire Arago
Sorbonne Université

 

Version française
English version

 

Rechercher

Sur le WEB du CNRS

 


Copépodes planctoniques marins

Copépodes planctoniques marins

 

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