Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Phaennidae ( Family )
            Xanthocalanus ( Genus )
Xanthocalanus legatus  Tanaka, 1960   (F)
Tanaka, 1960 a (p.92, Descr.F, figsF); Bradford & al., 1983 (p.71)
Species Xanthocalanus legatus - Plate 1 of morphological figuresissued from : O. Tanaka in Publ. Sero Mar. Biol. Lab., 1960, VIII (1). [p.93, Fig.85].
Female (Suruga Bay, Japan): a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and urosome (lateral left side); d, rostrum (anterior view); e, Mx2; f, P1; g, P2; h, endopod of P3; i, endopod of P4; j, P5.

Nota: Head and 1st thoracic segment fused, 4th and 5th incompletely fused (line of demarcation faintly visible in dorsal view).
Cephalothorax 2.05 mm; abdomen 0.55 mm.
Lateral distal margin of the last thoracic segment produced triangularly into a sharp point.
Rostrum strong in the basal, part, to which 2 slender filaments attached.
The abdominal segments and furca in the proportional lengths 40 : 22 : 16 : 9 : 13 = 100.
Genital segment, in ndorsal view, inflated toward the distal end; genital area hollowed.
The first 3 abdominal segments fringed withn fine teeth on the distal margin.
Caudal rami oblique, about as long as wide.
A2 exopodite longer than the endopodite (33 : 24).
Mx1 with 9 setae on the outer lobe, 10 setae on the exopodite, 3+2+2 setae on the endopodite, 5 setae on the 2nd basal segment.
Mx2 feeble; endopodite with small bud-like sensory setae.
P5 3-segmented, these 3 segments of about equal width. 2nd 2 times as long as wide, with hair-like spines on the anterior distal margin, and svattered spinules near the posterior distal margin; 3rd segment with 2 apical and 2 marginal spines, and bearing a longitudinal row of short spines on the posterior surface; 1st segme,t with denticles on the inner margin.

Species Xanthocalanus legatus - Plate 2 of morphological figuresissued from : O. Tanaka in Publ. Sero Mar. Biol. Lab., 1960, VIII (1). [p. 93].
Female: Proportions of segments of A1.

Nota: A1 (24-jointed) reaches back to the distal end of the 2nd abdominal segment.

NZ: 1

Distribution map of Xanthocalanus legatus by geographical zones
Japan (Suruga Bay)
N: 1
(4) F: 2,6; {F: 2,60}
Rem.: For Tanaka (1960, p.94) the species is closely allied to X. pinguis. In the haul 0-1000 m.
Last update : 02/02/2015
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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., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed June 05, 2023]

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Marine Planktonic Copepods

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