Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Stephidae ( Family )
            Stephos ( Genus )
Stephos rustadi  Strömgren, 1969   (F,M)
Ref.:
Strömgren, 1969 (p.1, figs.F,M); Bradford-Grieve, 1999 a (p.25, Table 1: Rem.); S.Y. Moon & al., 2015 (p.31: Rem.); Kos, 2016 (p.34, figs.F,M, Rem.)
Species Stephos rustadi - Plate 1 of morphological figuresissued from : T. Strömgren in Sarsia, 1969, 37. [p.2, Fig.1].
Female (from Lysefjorden: south of Bergen): habitus (lateral right side).


Species Stephos rustadi - Plate 2 of morphological figuresissued from : T. Strömgren in Sarsia, 1969, 37. [p.3, Fig.2].
Female: A, habitus (dorsal); B, Md; C, Mx2; D, A2; E, A1; F, Mxp; G, Mx1; H, P1; I, P2; J, P3; K, P4; L, P5.
Nota: Caudal rami with 2 strong and 1 small seta. Exopod 5-segmented, longer than endopod, with 3 terminal setae and 6 setae along the inner edge. masticatory edge of Md with 9 teeth, the outermost stronger, and the innermost more slender than the others; exopod 4-segmented with 6 setae; endopod 2-segmented, 2nd segment with 8 terminal setae.


Species Stephos rustadi - Plate 3 of morphological figuresissued from : T. Strömgren in Sarsia, 1969, 37. [p.4, Fig.3].
Male: A, habitus (dorsal); B, idem (lateral right side); C, A1; D, Mxp; E, Mx2; F, P5.
Nota: P1-P4 swimming legs as in female. Right leg of P5 longer than the left, with 4 segments; the last two segments very elongated, the last ending in a finely serrated claw-like structure. Left leg with 5 segments, the last segment with two heavy hook-like processes, the larger one with a secondary hook-like process, neary perpendicular to its base. segments

Compl. Ref.:
Holmes, 2001 (p.53, Rem.)
NZ: 1

Distribution map of Stephos rustadi by geographical zones
Loc:
Norway (west coast: Lysefjorden), North Sea, S Ireland (Lough Hyne)
N: 3
Lg.:
(560) F: 0,58-0,76; M: 0,58-0,64; {F: 0,58-0,76; M: 0,58-0,64}
Rem.: For Strömgren (1969, p.7) the species was found only in water with less 1.1 ml O2/l, either day or night, it may be assumed that this species tolerates and possibly finds optimal conditions in habitats with low oxygen content. Such an adaptation to low oxygen concentrations may explain its dominance over other copepods in the area.
After Bradford-Grieve (1999 a, p.25) this species belongs to type IV (see Genus Stephos).
Last update : 31/01/2019
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 27, 2024]

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