Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Clausocalanidae ( Family )
            Pseudocalanus ( Genus )
Pseudocalanus major  Sars, 1900   (F,M)
Syn.: no Pseudocalanus minutus major : Farran & Vervoort, 1951 e (n°37, p.3);
Pseudocalanus sp. McLaren, 1965 (part.); McLaren & al., 1966 (part. p.1641); Woods, 1969 (p.543, large form)
Ref.:
Sars, 1900 (p.69, figs.F,M); With, 1915 (p.57, Rem.); Sewell, 1948 (p.385); Brodsky, 1950 (1967) (p.114, figs.F,M); Kos, 1976 (Vol. II, figs.F,M); Corkett & McLaren, 1978 (p.5); Brodsky & al., 1983 (p.222, figs.F,M); McLaren & al., 1989 a (p.566); Frost, 1989 (p.539, Descr., figs.F,M, Rem.)
Species Pseudocalanus major - Plate 1 of morphological figuresissued from : Frost B.W. in Can. J. Zool., 1989, 67. [Fig.16, p.540].
Female: A, habitus (lateral view) from near New Siberian Islands; B, anterior portion of cephalosome (lateral view from left side); C, Th3 and U1 (lateral view from right side); D, Th3 and U1 (lateral view from right side) from Pseudocalanus acuspes.

Male: habitus (lateral view); F, anterior portion of cephalosome (lateral view from right side);
All scale bars = 0.1 mm.


Species Pseudocalanus major - Plate 2 of morphological figuresissued from : K.A. Brodsky, N.V. Vyshkvartzeva, M.S. Kos & E.L. Markhaseva in Opred Fauna SSSR, 1983, 135. [p.223, Fig.104]. Female & Male
Nota: Abdomen and P5 female from Brodsky, 1950; other figures from Sars, 1900.


Species Pseudocalanus major - Plate 3 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.115, Fig.36].
Female (from East Siberian Sea): habitus (dorsal and lateral right side); R, rostrum; S1, P1; urosome (lateral right side).


Species Pseudocalanus major - 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.115, Fig.36].
Female (from East Siberian Sea): habitus (dorsal and lateral right side): R, rostrum; urosome (lateral right side); S1, P1

Male: S5, P5.


Species Pseudocalanus major - Plate 5 of morphological figuresAs Pseudochirella fallax Male:
1 - Exopodite 2 of left P5 with 1 tooth in its distal part.
2 - Posterior corners of last thoracic segment without spines, rounded.
3 - Posterior corners without teeth.
4 - Distal part of exopodite 3 of right P5 rounded apically, without knob (unknown on the right leg).
5 - Body length > 4 mm.

Compl. Ref.:
Vinogradov & al., 1994 (tab.1); Petryashov & al., 1995 (tab.1); Abramova, 1996 (tab.1); Kosobokova & al., 1998 (tab.2); Abramova, 1999 (p.161, Table 2); Kosobokova & Hirche, 2000 (p.2029, tab.2); Lischka & al., 2001 (p.186); Dvoretsky & Dvoretsky, 2009 a (p.11, Table 2, abundance); Galbraith, 2010 (pers. comm.: no occur on west coast in British Columbia); Dvoretsky & Dvoretsky, 2010 (p.991, Table 2); Kosobokova & al., 2011 (p.29, Table 2, 3, fig.4, Rem.: Arctic Basins); Matsuno & al., 2011 (p.1349, Table 1, abundance vs years); Matsuno & al., 2012 (Table 1, 2, fig.6)
NZ: 4

Distribution map of Pseudocalanus major by geographical zones
Species Pseudocalanus major - Distribution map 2issued from : B.W. Frost in Can. J. Zool., 1989, 67. [p.529, Fig.3].
Geographical distribution of Pseudocalanus spp.
Loc:
Arct. (Barents Sea, Pechora Sea Nansen Basin, N Siberia, N Greenland, Kara Sea, Laptev Sea, Amundsen Basin, Makarov Basin, Beaufort Sea, Chukchi Sea), Bay of Cumberland, Nova Scotia, G. of Alaska
N: 20
Lg.:
(22) F: 2,4-2,1; M: 2-1,8; (122) F: 2,29-1,52; M: 1,67-1,4 ; (134) F: 2,4; M: 1,8; {F: 1,52-2,40; M: 1,40-2,00}
Rem.: ± brackish.

Characteristics according to Frost (1989): See limits of lenght measurements in the figure of the genus Pseudocalanus
Female: Frontal part in lateral view rounded; mediodorsal surface of one or more of I1-U3 with sensillum; mediodorsal surface of U1-U3 with integumental pore; seminal receptacle large; ratio sizes Prosome:Urosome = 2.20 (2.11-2.31).
Male: ratio sizes of P4 B1:B2 < 1.5; ratio sizes of segments of A1 (8-12):(20-21) < 2.0; mediodorsal surface of one or more of U2-U4 with sensillum; ratio sizes U2:U4 > 1,37; ratio sizes Cephalosome: U2 = 5.02 (4.73-5.37).
Last update : 10/04/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed January 25, 2022]

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