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Calanoida ( Order ) |
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Clausocalanoidea ( Superfamily ) |
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Diaixidae ( Family ) |
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Xancithrix ( Genus ) |
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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) |  Issued 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.
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 Issued 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.
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 Issued 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.
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 Issued 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.
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 Issued 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.
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 Issued 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.
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 Issued 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
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 Issued 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.
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Distribution map of Xancithrix ohmani by geographical zones
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| | | | 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) | | | Last update : 02/04/2019 | |
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 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., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed April 25, 2024] © copyright 2005-2024 Sorbonne University, CNRS
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