Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Stephidae ( Family )
            Stephos ( Genus )
Stephos marsalensis  Costanzo, Campolmi & Zagami, 1990   (F,M)
Costanzo & al., 2000 (p.2008, figs.F,M); Vives & Shmeleva, 2007 (p.854, figs.F,M); S.Y. Moon & al., 2015 (p.31: Rem.); Brylinski & Courtot, 2019 (p.6, Rem. F, figs. F)
Species Stephos marsalensis - Plate 1 of morphological figuresissued from : G. Costanzo, M. Campolmi & G. Zagami in J. Plankton Res., 2000, 22 (10). [Figs.2, 3].
Female (from W Sicily): A, habitus (dorsal view); B, urosome (ventral); C, genital double-somite (right side); D, idem (left side); E, P5 (posterior view); F, P1; G, P2; H, P3, I, P4.

Species Stephos marsalensis - Plate 2 of morphological figuresissued from : G. Costanzo, M. Campolmi & G. Zagami in J. Plankton Res., 2000, 22 (10). [Fig.4].
Male: A, habitus (dorsal view); B, urosome (ventral view); C, A1; D, P5.

Species Stephos marsalensis - Plate 3 of morphological figuresIssued from : J.-M. Brylinski & L. Courcot in Bioinvasions Records, 2019, 8. [p.7, Fig.4].
Female (from 47°52'06''N, 03°55'00''W): A, ventral view of genital double-somite (DGS) and anterior surface of P5.>@ = asymmetry of postero-lateral corner of prosome; GO = genital operculum; B-C, right and left P5, respectively.
Diagonal arrows = central spines.
Scale bars: 100 µm (A); 10 µm (B-C).

- Posterolateral corners of prosome slightly asymmetrical, left side more elongated than right side and compressed in distal part.
- Urosome 4-segmented.
- Genital double-somite with vental genital aperture closed off by single unarmed and asymmetrical operculum . Proximal part of ventral and lateral surfaces on right side with incomplete transverse row of spinules; left side and dorsal surface ornamented with patch of minute spinules.
- P5 uniramous, 2-segmented, twisted posterioely and asymmetrical with right longer than left. Terminal part of segment 2 fringed by marginal spinules and ornamented with patch of spinules in middle of anterior surface, thicker on right leg. 1 very small central spine present distally to patch of spinules in both legs.

Compl. Ref.:
Mazzocchi & Di Capua, 2010 (p.428); Rekik & al., 2012 (p.336, Table 1, abundance); Belmonte, 2018 (p.273, Table I: Italian zones)
NZ: 2

Distribution map of Stephos marsalensis by geographical zones
W Medit. (W Sicily: Marsala), Sfax (N Tunisia), NE Atlantic (Concarneau)
N: 5
(967) F: 0,76; M: 0,73; (1226) F: 0,90; {F: 0,76-0,90; M: 0,73}
Rem.: coastal; hyperbenthic.
Also collected, for the first time off the mediterranean Sea, in the inner storage tank of the Marinarium at Concarneau by Brylinski & Courtot (2019) at temperature and salinity: 14°C, 36.0 psu and , 12 °C, 35.0 psu; 18 °C, 35.5 psu, and 19 °C, 35.0 psu, respectively in November, April, September and July.
The species belongs to ''group IV'' (see genus Stephos)
Last update : 06/02/2020
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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 30, 2024]

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