Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Scolecitrichidae ( Family )
            Scaphocalanus ( Genus )
Scaphocalanus medius  (Sars, 1907)   (F,M)
Syn.: Amallophora media Sars, 1907 a (p.16);
? Scolecithrix gracilipes Farran, 1908 b (p.52, figs.F, Rem.);
Scaphocalanus major : Park, 1970 (p.476, 503, figs.F); ? Roe, 1972 (p.309);
Ref.:
Sars, 1925 (p.173, figs.F); Rose, 1933 a (p.149, figs.F); Sewell, 1929 (p.208, Rem.); ? Wilson, 1942 a (p.207, fig.F); Lysholm & al., 1945 (p.28); C.B. Wilson, 1950 (p.328, figs.F,M, Rem.); ? Brodsky, 1950 (1967) (p.251, Descr.M, figs.F,M, Rem.)Vaupel-Klein, 1970 (p.4, 19); Bradford, 1973 (p.143), Björnberg & al., 1981 (p.639, figs.F); Park, 1982 (p.77, 110, figs.F, Rem.); Bradford & al., 1983 (p.93, 101); Vives & Shmeleva, 2007 (p.763, figs.F,M, Rem.)
Species Scaphocalanus medius - Plate 1 of morphological figuresissued from T. Park in Biology of the Antarctic Seas XI, Antarct. Res. Ser, 1982, 34. [p.111, Fig.21].
Female: a, forehead (lateral); b, last thoracic segment and urosome (lateral left side); c, genital segment (lateral); d, P1 (anterior); e, P2 (posterior); f, P3 (posterior); g, P5 (posterior); h, distal part of inner spine of P5.
Nota: Urosome about 29/100 length of prosome. All cephalosomal pappendages seem similar to those of S. major. The species differs from S. major by anterior surface spinulation of P1.


Species Scaphocalanus medius - Plate 2 of morphological figuresIssued from : T. S. Park in Bull. Mar. Sc., 1970, 20 (2). [p.506, Figs.147-153]. As Scaphocalanus major.
Female (from Caribbean Sea & G. of Mexico): 147, habitus (lateral right side); 148, rostrum (anterior view); 149, P1 (anterior); 150, P2 (posterior); 151, P3 (posterior); 152, P4 (posterior); 153, P5.
Nota: prosome a little more than 3 times length of urosome. P5 2-segmented, the external spine small and often absent.


Species Scaphocalanus medius - Plate 3 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XLIX, figs.1-8].
Female: 1, habitus (dorsal); 2, idem (lateral left side); 3, rostrum; 4, P1; 5, P2; 6, endopodal segments of P3; 7, endopodal segments of P4; 8, P5.


Species Scaphocalanus medius - Plate 4 of morphological figuresIssued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.251, Fig.158]. With doubt.
Female (from NW Pacif.): habitus (dorsal and lateral right side); S5, P5.

Male: habitus (dorsal; S5, P5.
Nota: Pacific specimens are larger than the Atlantic ones; they also differ in the length ratio of the inner bristle of P5 in female.


Species Scaphocalanus medius - Plate 5 of morphological figuresissued from : C.B. Wilson in Scientific Results of Cruise VII of the Carnegie during 1928-1929. Biology-I. Carnegie Inst. Wash. Publ. 536, 1942. [p.233, Fig.136]. With doubt.
Female (from SE Pacific): 136, P5.
Nota: Head without crest. The structure of P5 is quite different from that in the other authors.

Compl. Ref.:
Sewell, 1948 (p.349, 502, 521, 546, 566); Fagetti, 1962 (p.24); Grice, 1963 a (p.495); Unterüberbacher, 1964 (p.24); De Decker & Mombeck, 1964 (p.14); Grice & Hulsemann, 1965 (p.224); Fleminger, 1967 a (tabl.1); Carter, 1977 (1978) (p.35); Deevey & Brooks, 1977 (p.256, Table 2, station "S"); Vives, 1982 (p.292); Lozano Soldevilla & al., 1988 (p.59); Lapernat, 2000 (tabl.3, 4); Razouls & al., 2000 (p.343, Appendix); Yamaguchi & al., 2002 (p.1007, tab.1); Sameoto & al., 2002 (p.13); Somoue & al., 2005 (Table I: p.68); Ikeda & al., 2006 (p.1791,Table 2); Gaard & al., 2008 (p.59, Table 1, N Mid-Atlantic Ridge); Park & Ferrari, 2009 (p.143, Table 5, Appendix 1, biogeography); C.E. Morales & al., 2010 (p.158, Table 1); Homma & Yamaguchi, 2010 (p.965, Table 2); Homma & al., 2011 (p.29, Table 2, 3, abundance, feeding pattern: detritivores); Lidvanov & al., 2013 (p.290, Table 2, % composition)
NZ: 14

Distribution map of Scaphocalanus medius by geographical zones
Species Scaphocalanus medius - Distribution map 3
Chart of 1996
Loc:
sub-Antarct. (Indien, SW & SE Pacif.), South Africa (E), Namibia, off NW Cape Verde Is., off Morocco-Mauritania, Canary Is., off Madeira, Brazil, off SW Azores, Caribbean, G. of Mexico, Sargasso Sea, off Bermuda: Station ‘’ S’’ (32°10’N, 64°30’W), off E Nova Scotia, off E Newfoundland, S Iceland, ? W Ireland, Indian (off S Laccadive Is., Natal), Philippines, Japan, Pacif. (NW & NE), Bering Sea (Aleutian Basin), S Aleutian Is., Station Knot, Station "P", California, off Galapagos, Peru, off Chile, Concepcion
N: 29
Lg.:
(1) F: 2,4; (22) ? F: 3,1; M: 2,7; (76) F: 2,56-2,28; (88) F: 2,4-2,1; (137) F: 2,4-2; M: 1,82; (205) ? F: 3,1-2,9; (432) F: 2,55-2,4; {F: 2,00-2,56; M: 1,82}
Rem.: Bathypelagic.
Sampling depth (sub-Antarct.) : 0-2000 m. Sargasso Sea: 1000-1500 m (Deevey & Brooks, 1977, station "S");
Sometimes confused with Scaphocalanus major, as yet they are not synonymous. According to Vervoort (1965, p. 63) the described form under this designation by Brodsky, 1950 (1967) is a synonym of S. major. The geographical distribution remains uncertain.
Last update : 31/01/2015
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2019. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 20, 2019]

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