Species Card of Copepod
Calanoida ( Order )
    Ryocalanoidea ( Superfamily )
        Ryocalanidae ( Family )
            Yrocalanus ( Genus )
Yrocalanus bicornis  (Markhaseva & Ferrari, 1996)   (F)
Syn.: Markhaseva & Ferrari, 1996 (p.64, Descr.F, figs.F); Boxshall & Halsey, 2004 (p.184, p.183: fig.F); Bradford-Grieve, 2004 (p.283)
Ref.:
Renz & al., 2013 (p.258)
Species Yrocalanus bicornis - Plate 1 of morphological figuresissued from : E.L. Markhaseva & F.D. Ferrari in Zoosyst. Rossica, 1995 (1996), 4 (1). [p.66, Figs.14-22]. As Ryocalanus bicornis.
Female (13°22.8'N, 102°29.3'W): 14-15, habitus (lateral and dorsal, respectively); 16, rostrum (ventral); 17, forehead (lateral); 18-19, last segment of prosome and urosome (dorsal and left lateral); 20, right A2; 21, right Md (mandibular palp); 22, Mx2.

Nota : Prosome 4.4 times as long as urosome. Rostrum with 2 asymmetrical points. Posterior corners of prosome bicornous, exceeding the middle length of genital segment (in dorsal and lateral view). Genital segment with large lateral swellings on both sides in its middle length (dorsal view). A2 coxopodite with 1 seta ; basipodite with 2 setae ; exopodite 1 with 1 seta, exopodite 2 with 3 setae, exopodite 3-6 with 1 seta each, exopodite 7 with 1 medial and 3 terminal setae ; endopodite 1 with 1, endopodite 2 with 6 terminal setae plus 1 posterior seta at external and 8 terminal and 1 posterior setae at internal lobe. Md palp base with 2 setae, ; endopodite 1 with 3 setae, endopodite 2 with 9 terminal and 1 posterior setae (11 in R. admirabilis. Mx2 first endite with 5 setae, 2 nd to 5th endites with 3 setae each, 6th endite with 2 setae, terminal part with 5 setae.


Species Yrocalanus bicornis - Plate 2 of morphological figuresissued from : E.L. Markhaseva & F.D. Ferrari in Zoosyst. Rossica, 1995 (1996), 4 (1). [p.67, Figs.23-28]. As Ryocalanus bicornis.
Female: 23a, A1 (1st-11th segments); 23b, A1 (12th-17th segments); 23c, A1 (18th-25th segments); 24a, Mx1 (without gnathobase); 24b, Mx1 (gnathobase); 25-28, P1 to P4.
Scale bar: 0.1 mm.

Nota : A1 25-segmented. Mx1 1st internal lobe (gnathobase) with 7 thick and 1 thin apical setae, 2 proximal subapical setae, 3 posterior setae, and 1 anterior seta ; 2nd and 3rd internal lobes with 6 (5 in R. admirabilis) and 4 setae respectively ; basis plus endopod together have at least 21 setae ; exopod with 11 setae on left and 10 setae on right ; external lobe with 7 setae.

NZ: 1

Distribution map of Yrocalanus bicornis by geographical zones
Loc:
NE Pacif. ( off E Clipperton Is.)
N: 1
Lg.:
(522) F: 1,55; {F: 1,55}
Rem.: hyperbenthic (± 1300 m)
Last update : 27/08/2019
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed August 09, 2022]

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