Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Pontellidae ( Family )
            Calanopia ( Genus )
Calanopia media  Gurney, 1927   (F,M)
Gurney, 1927 (p.153, figs.F,M); Silas & Pillai, 1976 (p.789, figs.F, M, Rem.); Lakkis, 1984 (p.299, figs.F,M); Vives & Shmeleva, 2007 (p.493, figs.F,M, Rem.)
Species Calanopia media - Plate 1 of morphological figuresissued from : E.G. Silas & P.P. Pillai in J. mar. biol. Ass. India, 1973 (1976), 15 (2). [p.789, Fig.5].
Female (from Red Sea): a, urosome (dorsal); b, genital segment (ventral); c, urosome (lateral right side), d, P5.

Male: e, urosome (dorsal); f, right A1 (geniculate part); g, P5.
Scale as in Calanopia minor.

Species Calanopia media - Plate 2 of morphological figuresCalanopia media.
1 - P5 exopod 2-segmented.
2 - Cephalic lateral hooks absent.
3 - P5 symmetrical.
4 - Caudal rami symmetrical.
5 - 2nd exopodal segment of P5 longer than 1st one.
6 - 1st exopodal segment of P5 with 2 spines distally.
7 - Genital compound somite with ventral spines.
1 - Left P5 shorter than right one; basis of left P5 not swollen proximally.
2 - Prosomal posterolateral corner symmetrical.
3 - Cephalic lateral hooks absent.
4 - 2nd urosomite symmetrical and without any processes.
5 - 2nd exopodal segment of right P5 shorter than 1st one, curved at mid-length with 1 short and 1 long setae; basis of left P5 longer than 1st exopodal segment.

Species Calanopia media - Plate 3 of morphological figuresIssued from : R. Gurney in Trans. zool. Soc. London, 1927, 22. [p.152, Fig.20].
Female (Port Taufik): A, habitus (dorsal); B, abdomen (ventral); C, P5.

Male: D, habitus (dorsal); E, part of right A1; F, P5.

Nota female:
- Abdomen less than half length of thorax.
- Thoprax 2.5 times as long as broad.
- Last thoracic somite produced symetrically backwards as a pointed process, reaching nearly half length of genital somite.
- Abdomen of 2 somites.
- Genital somite longer than the anal somite (36 : 25). On right side, 2 small spines one above the other, and a small fold of the cuticle is, in some cases but not in all, present on the ventral surface on the right side. Genital operculum round.
- Furcal rami (= caudal rami) a little shorter than anal somite (19 : 21), either quite symmetrical, or right side with a somewhat indented inner margin.
- A1 reaches back to about middle of genital somite and consists of 17 segments.
- P5 symmetrical, 3-segmented. Basal segment fused with basal plate (= intercoxal sclerite). Basipodal segment 2 (= Basis) about same length as exopodal segment 1 , the latter bears 2 strong spines; 2nd exopodal segment with 2 outer spines, of which the proximal is very short, and is prolonged into a terminal spine which extends beyond distal outer spine by about 2/3 of length of latter.

Nota male:
- Relative lengths of thorax, abdomen and furca 63 : 30 : 11.
- Thorax as in female, 2.5 times as long as broad.
- Somites of abdomen symmetrical, without lateral processes.
- Furcal rami divergent to a variable extent, but usually so much so as almost to form a right angle.
- A1 reaches back to end of 2nd abdominal somite.
- Relative lengths of last 6 segments (= 5 somites + caudal ramus) 33 : 39 : 45 : 43 : 31 : 40.
P5 closely resembling those of C. elliptica, but without the scalloped edge to the broad subterminal segment of the right leg.

Species Calanopia media - Plate 4 of morphological figuresIssued from : R. Gurney in Trans. zool. Soc. London, 1927, 22. [p.154].
Relative lengths of cephalothorax, abdomen and caudal rami; and the genital double-somite and the 2nd abdominal somite. Comparison between Calanopia media, C. elliptica and C. minor females.

Compl. Ref.:
Sewell, 1948 (p.441); Berdugo, 1968 (p.445); Lakkis, 1976 (p.83: Rem.); Kovalev & Shmeleva, 1982 (p.85); Moraitou-Apostolopoulou, 1985 (p.303, occurrence/abundance in E Mediterranean Sea, Rem.: p.313); Lakkis, 1990 (p.63); Mauchline, 1998 (p.507); Kovalev, 2006 (p.67: Lessepsian migration); Zenetos & al., 2010 (p.397).
NZ: 3

Distribution map of Calanopia media by geographical zones
E Medit. (Lebanon, off Haifa), Suez Canal, Red Sea, Viet-Nam (in Rose, 1956, p.461)
N: 7
(178) F: 2-1,7; M: 2-1,6; (256) F: 1,98-1,68; M: 1,95-1,6; {F: 1,68-2,00; M: 1,60-2,00}
Rem.: The presence of this species near the coasts of Israel and Lebanon is probably due to introduction through the Suez canal (Lessepsian migration).
After El-Sherbiny & Al-Aidaroos (2017, on line) , El-Sherbiny pointed out that C. media showed a clear diel vertical migration at the central Red Sea, where they were collected with a considerable abundance (106 ind/m3) at sunset and with the highest density at a midnight collection (150 ind/m3), but were completely missed in morning and mid-day samples. Also, the author reported the asymmetry in caudal rami of 90 % of the population collected from the central Red Sea, were the right ramus is broader, slightly shorter than the left one, with an anteromedial expansion. C. tulina and C. sarsi from Fiji Islands and C. media reexamined from the central Red Sea are the only species with asymmetry of male prosomal corners.
Last update : 17/04/2020
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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 21, 2024]

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