Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Stephidae ( Family )
            Stephos ( Genus )
Stephos canariensis  Boxshall, Stock, Sanchez, 1990   (F,M)
Ref.:
Boxshall & al., 1990 (p.33, figs.F,M); Huys & Boxshall, 1991 (p.49, 86, 359, figs.F); Bradford-Grieve, 1999 a (p.25, Table1: Rem.); Vives & Shmeleva, 2007 (p.857, figs.F,M, Rem.)
Species Stephos canariensis - Plate 1 of morphological figuresissued from : G.A. Boxshall, J.H. Stock & E. Sanchez in Stygologia, 1990, 5 (1). [p.34, Fig.1].
Female (from lanzarote: Canary Islands): a, habitus (dorsal); b, A2; c, Md; d, Mx2.
Nota: Head and 1st pedigerous somite separate, 4th and 5th fused. Rostrum absent. Urosome 4-segmented. Genital double somite comprising completely fused genital and 1st abdominal somites, slightly asymmetrical, expanded anteriorly on right side; single genital opening located ventrally on right side; genital aperture oriented obliquely, closed off by a single unarmed operculum derived from the fused P6.; remains of 2 discharged spermatophores emerging from beneath operculum (fig.5b). A2 with coxa and basis incompletely fused; endopod 2-segmented; exopod 6-segmented. Mx2 small, comprising praecoxa, coxa, and basis each armed with 2 endites, and a 3-segmented endopod


Species Stephos canariensis - Plate 2 of morphological figuresissued from : G.A. Boxshall, J.H. Stock & E. Sanchez in Stygologia, 1990, 5 (1). [p.35, Fig.2].
Female: a, A1; b, Mx1; c, Mxp; d, P1; e, P5.
Nota: A1 24-segmented; segments I and II incompletely fused, segment II representing a triple segment; segment VIII representing a triple segment. Mx1 with well defined praecoxa produced into powerful endite bearing 8 stout spines and 4 slendersetae; Coxa with 3 setae on endite; outer lobe (epipodite) represented by 9 setae on surface segment; basis fused to endopod, lacking outer seta; proximal endite discrete, bearing 4 setae;distal endite incorporated into segment , represented by 5 setae; fused endopod armed with proximal and distal groups of 4 setae on inner margin; free apical segment with 7 setae; exopod 1-segmented, with 11 setae along distal and lateral margins. mxp 7-segmented; 1st segment (syncoxa) comprising fused praecoxa and coxa, armed with a hirsute lobe and 3 groups of setae along medial margin; basis ornamented with a row of stout spinules and some fine denticles; free endopod 5-segmented. P5 reduced, uniramous; basal part representing fused coxae and intercoxal sclerite, ornamented with minute denticles


Species Stephos canariensis - Plate 3 of morphological figuresissued from : G.A. Boxshall, J.H. Stock & E. Sanchez in Stygologia, 1990, 5 (1). [p.36, Fig.3].
Female: a-c, P2 to P4.


Species Stephos canariensis - Plate 4 of morphological figuresissued from : G.A. Boxshall, J.H. Stock & E. Sanchez in Stygologia, 1990, 5 (1). [p.38, Fig.5].
Female (Scanning Electron Micrographs): a, urosome (ventral); b, genital aperture, showing spent spermatophores (arrowed); c, P5; d, A1 segments XI and XII, showing comb of spinules (arrowed) on ventral surface of segment XII.
Scale bars: a = 0.050 mm, b-d = 0.010 mm.


Species Stephos canariensis - Plate 5 of morphological figuresissued from : G.A. Boxshall, J.H. Stock & E. Sanchez in Stygologia, 1990, 5 (1). [p.37, Fig.4].
Male: a, habitus (lateral); b, urosome (ventral); c, A1; d, P5 (anterior view).
head and 1st pedigerous somite marked by complete suture, 4th and 5th fused. Urosome 5-segmented. Genital segment slightly asymmetrical, single functional genital opening on left side; 4th and urosome somite ornamented with row of stout spinules along posterior border. A1 24-segmented; Other mouthparts and swimming legs 1 too 4 as in female in segmentation and setation. P5 as grasping organ, uniramous, markedly asymmetrical; right leg slender 4-segmented; 1st and 2nd segments short; 3rd segment very long; 4th segment comprising 2 processes oriented at right angles, both uramed; left leg 5-segmented, 1st to 3rd segments short, unarmed; 4th segment robust ornamented with row of short spinules distally along inner margin; 5th segment complex, trifid, innermost branch tapering and unarmed; middle and outer branches separate distally, outer branch spoon-like and bearing small denticles around rim of concave tip.


Species Stephos canariensis - Plate 6 of morphological figuresissued from : G.A. Boxshall, J.H. Stock & E. Sanchez in Stygologia, 1990, 5 (1). [p.40, Fig.6].
Male (Scanning Electron Micrographs): a, P5 (anterior view); b, tip of right leg; c, distal segments of left leg; d, apex of outer process of left leg.
Scale bars: a = 0.040 mm, b = 0.010 mm, c = 0.020 mm, d = 0.004 mm.

NZ: 1

Distribution map of Stephos canariensis by geographical zones
Loc:
Canary Islands (Lanzarote Is.: anchialine lava pool)
N: 1
Lg.:
(552) F: 0,695-0,641; M: 0,641-0,595; {F: 0,64-0,70; M: 0,60-0,64}
Rem.: salinity: 27 p.1000. Anchialine pool.
Boxshall & al., 1990, p.41) point out: the species of Stephos have not previously been recorded from anchialine habitats.

After Bradford-Grieve (1999 a, p.25) this species belongs to type III (see Genus Stephos).
Last update : 14/08/2015
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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 18, 2021]

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