Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Stephidae ( Family )
            Stephos ( Genus )
Stephos hastatus  Bradford-Grieve, 1999   (F,M)
Bradford-Grieve, 1999 a (p.15, figs.F,M, Table 1); S.Y. Moon & al., 2015 (p.33: Rem.)
Species Stephos hastatus - Plate 1 of morphological figuresissued from : J.M. Bradford-Grieve in N.Z. Jl mar. freshw. Res., 1999, 33. [p.16, Fig.1].
Female (Wellington Harbour, New Zealand): A, habitus (lateral left side); B, idem (dorsal); C, urosome (dorsal); D, idem (lateral left side); E, genital double-somite (ventral).

Species Stephos hastatus - Plate 2 of morphological figuresissued from : J.M. Bradford-Grieve in N.Z. Jl mar. freshw. Res., 1999, 33. [p.17, Fig.2].
Female: A, A1; B, A2; C, Md; D, Md (mandibular gnathobase); E, Mx1; F, Mx2.

Nota: Mx1 praecoxal arthrite with 9 terminal spines and 4 posterior surface setae; coxal endite and basal endites 1 and 2 with 3, 4, 5 setae respectively; basis and endopod fused, endopod with 4+5+7 setae; exopod with 11 setae and a row of small surface spinules; coxal epipodite with 9 setae ; basal exite without setae.

Species Stephos hastatus - Plate 3 of morphological figuresissued from : J.M. Bradford-Grieve in N.Z. Jl mar. freshw. Res., 1999, 33. [p.18, Fig.3].
Female: A, Mxp; B, P1 (posterior view); C, P2 (anterior view); D, P3 (anterior view); E, P4 (posterior view); F, P5 (posterior view).

Nota: P5 uniramous, symmetrical, coxae fused to the intercoxal sclerite, basis separated from the single, tapering, terminal segment. Segment 2 (basis) with inner proximal patch of very fine spinules on anterior surface, and a distinct pore on inner border at about mid-length. Segment 3 constricted slightly at about mid-length and with striated hyaline fringe around the terminal tapering part of the segment; a fine outer edge seta is inserted at the constriction; a distinct anterior surface pore is found on the proximal half of segment 3; there are 2 patches of spinules: one patch is located at level of the pore on the posterior surface, the second row is on the anterior surface curving from the inner surface distally to the constriction.

Species Stephos hastatus - Plate 4 of morphological figuresissued from : J.M. Bradford-Grieve in N.Z. Jl mar. freshw. Res., 1999, 33. [p.19, Fig.4].
Male: A, habitus (dorsal); B, idem (dorso-lateral right side); C, urosome (lateral right side); D, P5 (L = left; R = right).

Nota: A swollen left P5 segment 4.

Nota: Cephalosome incompletely separated from pediger , pedigers 4 and 5 fused alyjough the fusion line is visible mid-dorsally.
- P5 very asymmetrical, slender on the right and large and developed as a grasping organ on the left. Right leg 4-segmented; coxa about twice as long as the basis, unarmede; segment 3 elongate, unarmed, but with 1 triangular proximal process and 2 distal processes (distal-most rounded terminally and directed posteriorly, the other triangular and directed anteriorly); segment 4 comprising 2 processes set at right angles, distally-directed branch tapering, outwardly-directed branch curved distally and rounded at its tip. Left leg 5-segmented; coxa and basis of similar length to that on the right side, unarmed; segment 3 short, unarmed, almost fused with segment 4; segment 4 robust, with a short strong spine on the anterior distal surface and a very long stout spine inserted at the distal inner corner of the segment and almost as long as its segment; segment 5 complex, with 2 elongate, leaf-like appendages.

NZ: 1

Distribution map of Stephos hastatus by geographical zones
New Zealand (Wellinton Harbour: Evans Bay)
N: 1
(774) F: 1,09-0,92; M: 1,02-0,85; {F: 0,92-1,09; M: 0,85-1,02}
Rem.: In 12 m of water in Evans Bay.
According to Bradford-Grieve (1999 a, p.19) this species is similar to S. pacificus and S. robustus. There is a small amount of variation in the numbers of spinules on the genital double-somite and on the surfaces of the swimming legs.
After Bradford-Grieve (1999 a, p.25) this species belongs to type III (see Genus Stephos).
Last update : 22/01/2016
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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 July 22, 2024]

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