Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Stephidae ( Family )
            Stephos ( Genus )
Stephos scotti  Sars, 1902   (F,M)
Syn.: Stephos gyrans : T. Scott, 1897 (p.146, Pl. II, fig.9; Pl. III, figs. 17-18));
Stephus scotti : Sewell, 1948 (p. 483)
Sars, 1902 (1903) (p.63, figs.F,M); Wolfenden, 1908 (p.22); van Breemen, 1908 a (p.85, figs.F, M); Rose, 1933 a (p.162, figs.F,M); Strömgren, 1969 (p.5); Bradford-Grieve, 1999 a (p.25, Table1: Rem.); Boxshall & Halsey, 2004 (p.201, fig.F); Kos, 2016 (p.37, figs.F, M, Rem.)
Species Stephos scotti - Plate 1 of morphological figuresissued from : G.O. Sars in An Account of the Crustacea of Norway. Vol. IV. Copepoda Calanoida. Published by the Bergen Museum, 1903. [Pl. XLIII].
Female & Male.

Nota Female: Lateral parts of last thoracic segment perfectly symmetrical, not lamellarly expanded. Urosome exceeding in lenth 1/3 of prosome. Genital segment symmetrical, without any prominences or processes. Caudal rami somewhet longer than they are broad. A1 reaching about to the end of the 2nd urosomal segment. A2 with exopod almost twice as long as the endopod. P5 with terminal segment slightly flexuous, without any spinule at the base, but armed outside the distal part with about 10 coarse denticles.

Nota Male: Right P5 somewhat longer and much more slender than left, its penultimate segment rather narrow and produced at the base outside to an acute lappet, terminal segment forming a strong curved claw, with a thumb-like projection at the base inside; penultimate segment of left P5 much tumefied, but quite simple, without any processes or spinules, terminal segment carrying a row of rather small leaf-like appendages outside, and at the tip 2 short, juxtaposed claw-like lamellae.

Species Stephos scotti - Plate 2 of morphological figuresissued from : T. Scott in Rep. Fishery Bd Scotl., 1897, 15 (3). [Pl.III, Figs.17, 18]. As Stephos gyrans.
Female (from off Largabruach, Upper Loch Fyne, Scotland): 17, habitus (lateral); 18, P5.

Species Stephos scotti - Plate 3 of morphological figuresissued from : T. Scott in Rep. Fishery Bd Scotl., 1897, 15 (3). [Pl.II, Figs.9]. As Stephos gyrans.
Female: 9, A1.

Species Stephos scotti - Plate 4 of morphological figuresIssued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179. [p.38, Fig.17 (part.)]. Stephos scotti P5 female and male (redrawn ifrom Sars, 1902).

Compl. Ref.:
T. Scott, 1902 (p.450, Rem.); Matthews, 1967 (p.159, Table 1, Rem.); Holmes, 2001 (p.53, Rem.); Uysal & al., 2002 (p.18, tab.1); Brylinski, 2009 (p.253, Tab.1)
NZ: 2

Distribution map of Stephos scotti by geographical zones
W & S Ireland, Lough Hyne, Scotland (Loch Fyne, Firth of Forth, Sound of Mull), Norway (west coast: south of Aalesund, Raunefjorden: all the year), North Sea, Bay of Kiel, Pas de Calais (in Brylinski, comm. pers.), Médit. (Lebanon Basin) (in Uysal & al, 2001, comm. pers.). Other locality:

62°28' N, 6°10' E.
N: 9
(65) F: 0,95; M: 0,85; {F: 0,95; M: 0,85}
Rem.: The presence of this species in the Eastern Mediterranean could be an example of relict forms from glacial periods in this sea.
After Sars (1903, p.64) , the movements of the animal are curious, constituting a perfectly regular whirling run, in which the body is kept in a horizontal attitude just above the bottom. This peculiar manner of motion is probably common to all the species of this genus.
After Bradford-Grieve (1999 a, p.25) this species belongs to type III (see Genus Stephos).
Last update : 07/02/2019
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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 May 26, 2022]

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