Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Phaennidae ( Family )
            Xanthocalanus ( Genus )
Xanthocalanus difficilis  Grice & Hulsemann, 1965   (F)
Ref.:
Grice & Hulsemann, 1965 (p.223, 235, Descr.F, figs.F); Bradford, 1973 (p.146, Rem.); Bradford & al., 1983 (p.71, 104); Vyshkvartzeva, 1999 (2000) (p.221)
Species Xanthocalanus difficilis - Plate 1 of morphological figuresissued from : G.D. Grice & K. Hulsemann in J. Zool., 1965, 146. [p.236, Fig.11].
Female: a, habitus (lateral left side); b, urosome (ventral); c, Md (mandibular palp); d, Md (cutting edge); e, Mx1 (spines on 1st inner lobe omitted); f, Mx2; g, Mxp; h, P1; i, P2; j, basipod segments of P3; k, endopod of P3; l, P4 (2nd and 3rd exopod segments missing); m, P5.
Nota: Rostrum triangular, filaments absent.
Head and 1st thoracic segment fused, 4th and 5th separate. A1 24-segmented (segments 8 and 9 fused).
Genital segment dilated laterally.
1st basipodal segments of P3 and P4 and surface of exopods and endopods of P1 to P4 with numerous spines.
P5 3-segmented, distal segment with long inner and short terminal spine; surface of 2nd and 3rd segments with scattered spines.

NZ: 1

Distribution map of Xanthocalanus difficilis by geographical zones
Loc:
NE Atlant. (32°29'N, 20°09'W; 29°57'N, 22°58'W)
N: 1
Lg.:
(226) F: 1,34-1,15; {F: 1,15-1,34}
Rem.: bathy-abyssopelagic (1500-4000 m).
Probable in the Groupe "Scolecithrix ctenopus". Probable in the genus Scolecitrichopsis.
For Grice & Hulsemann (1965, p.235)this species differs from other species of Xanthocalanus by its single pointed rostrum, lack of filaments and structure of P5. This species resembles X. fallax (Sars, 1903).
Last update : 02/02/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed October 21, 2021]

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