Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Scolecitrichidae ( Famille )
            Scottocalanus ( Genre )
Scottocalanus thori  With, 1915   (F,M)
Syn.: S. helenae : A. Scott, 1909 (p.111, figs.M); Sewell, 1929 (p.183); Mori, 1937 (1964) (p.49); Sewell, 1947 (p.143, Rem.); C.B. Wilson, 1950 (p.338, M, no F); ? Chiba, 1956 (p.54); Shih & Chiu, 1998 (p.538);
? S. persecans : Sars, 1925 (p.157, figs.F,M, Rem); ? Jespersen, 1940 (p.35); Wilson, 1932 a (p.80); Brodsky, 1950 (1967) (p.241, figs.F,M);
? S. terranovae Farran, 1929 (p.252, M only)
With, 1915 (p.215, figs.F,M); Farran, 1926 (p.266); Tanaka, 1961 a (p.140, Rem.); Vervoort, 1965 (p.56, Rem.: p.54); Morris, 1970 (p.2301, 2312, figs.F, Rem.); Park, 1983 (p.198, 208, Redescr. F, figs.F, Rem., as thorii); Bradford & al., 1983 (p.116, 120, Rem., figs.F,M); Roe, 1984 (p.357); Mulyadi, 1998 a (p.393, Redescr.M, figs.M, Rem.: p.396); Mulyadi, 2004 (p.36, figs.M, Rem.); Vives & Shmeleva, 2007 (p.812, figs.F,M, Rem.)
Espèce Scottocalanus thori - Planche 1 de figures morphologiquesissued from : Mulyadi in The Raffles Bull. Zool., 1998, 46 (2). [p.395, Fig.9].
Male (Flores Sea): a, habitus (dorsal); b, forehead (right lateral side); c, last thoracic segment and urosome (right lateral side); d, rostrum (frontal view); e, P2; f, P3; g, P5; h, distal segment of left P5.

Espèce Scottocalanus thori - Planche 2 de figures morphologiquesIssued from : J.M. Bradford, L. Haakonssen & J.B. Jillett in Mem. N. Z. oceanogr. Inst., 1983, 90. [p.121, Fig.75].
Female: A, habitus (lateral right side); B, genital segment (dorsal); C, genital segment and P5 (lateral left side); D, rostrum; E, endopod of P2; F, P5.

Male: G, habitus (lateral left side); H, P5; I, terminal part of left P5 exopod.

Diagnosis from Bradford, Haakonssen & Jillett (1983, p.120), and Vives & Shmeleva (2007, p.812) :
Female :
- Head with with triangular crest, but less salient and more rounded than in S. helenae.
- Rostral projections shorter excavation with very short, blunt points.
- Prosome 4.5 times length of urosome.
- Posterolateral corners of last thoracic segment triangularly produced but obtusely rounded.
- Urosome 4-segmented.
- Genital segment symmetrical, moderately swollen ventrally, as long as following three urosomal segments.
- A1 24-segmented, reaching distal end of urosomal segment 3 [or more ].
- P5 with 3 indistinct segments, distal segment with small apical conical process bearing short spine and long sub-apical spine with rudimentary hair at its base ; long spine extends to end of urosomal segment 3.

Male :
- Rostrum more slender than in female.
- Posterior of urosomal segments 2-4 serrated.
- A1 extends to urosomal segment 4.
- P5 distinctly longer than urosome. Right leg endopod extends well beyond exopodal segment 1 ; exopod segment 1 with several projections medially, terminally produced inwards, exopod segment 2 curved, segment 3 short and pointed. Left leg endopod extends beyond exopodal segment 1, with indication of segmentation ; exopod 2-segmented, distal segment terminates in 2 or 3 leaf-like structure including slender hook-shaped organ with terminal setae and plate with at least 7 serrations.

Espèce Scottocalanus thori - Planche 3 de figures morphologiquesissued from : T. Park in Antarct. Res. Ser. Washington, 1983, 38 (3). [p.209, Fig.25].
Female: a, forehead (lateral); b, last thoracic segments and urosome (lateral right side); c, idem (dorsal); d, anterior part of head (dorsal); e, rostrum (anterior); f, P5 (anterior).

Nota: Cephalosome and 1st metasomal segment fused, 4th and 5th separate on dorsal side. Urosome about 19/100 length of prosome. A1 extending beyond distal end of metasome by its last 4 segments. All cephalosomal appendages and first 4 pairs of legs agree in anatomical details with those of .

Espèce Scottocalanus thori - Planche 4 de figures morphologiquesissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XXVII, Figs.1-9]. As Scottocalanus helenae.
Male (from Halmahera Sea): 1, habitus (dorsal); 2, forehead (lateral); 3, last thoracic and genital segments (left side); 4, rostrum; 5, A1; 6, Mx2 (distal portion); 7, P2; 8, P4; 9, P5.

Espèce Scottocalanus thori - Planche 5 de figures morphologiquesissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (2nd edit., 1964). [Pl.23, Figs.9-15]. As Scottocalanus helenae.
Male: 9, habitus (dorsal); 10, A2; 11, P2 (posterior); 12, P1; 13, P5 (anterior); 14, P4; 15, P3 (posterior).

Espèce Scottocalanus thori - Planche 6 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [p.216, Text-fig. 68]. As Scaphocalanus thorii.
Female (from 51°32'N, 12°03'W): a, forehead (lateral); b, rostrum; c, last two thoracic segments and urosome (dorsal); d, last thoracic segment with P5 and urosome (left lateral); e, segments 8-10 of A1; f, basis, endopod and exopodal segments 1, 2 of left P2 (anterior view); g, P5 (anterior view); h, base of spine (posterior view); i, base of spine (partly anterior view).

Espèce Scottocalanus thori - Planche 7 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VI, 14 a-c]. As Scaphocalanus thorii.
Female: a, labrum (anterior view); b, same (oral view); c, lamina labialis and serrula 6-dentata.

Espèce Scottocalanus thori - Planche 8 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [p.217, Text-fig. 69]. As Scaphocalanus thorii.
Male: a, last thoracic segment and urosome (dorsal); b, right P5 (from the left and partly from below); c, exopodal segment 3 of right P5 (from below); d, left P5 (exopodal segment 3 from the right side).

Espèce Scottocalanus thori - Planche 9 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VIII, Fig. 14 a, b]. As Scaphocalanus thorii.
Male: a, last thoracic segment with P5 and urosome (left lateral); b, left P5.

Espèce Scottocalanus thori - Planche 10 de figures morphologiquesissued from : B. Morris in J. Fish. Res. Bd Canada, 1970, 27 (12). [p.2313, Fig.8].
Female (from subtropical central North Pacific): A, forehead (lateral); B, rostrum (anterior); C-D, posterior prosome and urosome (lateral and dorsal, respectively); E, P1 (anterior); F, P2 (anterior); G, P3 (anterior); H, P4 (anterior); I, P5; J, distal segments of left P5.

Nota: Body of rich brown color.
Prosome to urosome ratio 45: 10.
General shape as in S. helenae but cephalic crest more rounded.
Rostral plate width (at base) to length (from base to tips of points) in ratio of 10 : 11. Rostral poins occupying 0.5 depth of depression. Lateral margins of rostral plates slightly inflated.
A1 24-segmented.
5th thoracic segment (in lateral view) produced into bluntly triangular corners and emarginate below. Corners (in dorsal view) triangularly produced with small, knoblike tips.
Urosome 4-segmented. Proportional lengths of urosomal segments and caudal rami 68 : 27 : 23 : 10 : 35.
Genital segment symmetrical with moderate ventral swelling.
Urosome segments without teeth along distal margins.
P2 and P3-P4 with distinctive spinulation on anterior surface of exopodite and endopodite. Exopodite of P4 without anterior spinulation.
P5 with 1 free segment on each side. Apical spine short and triangular, and with a small spinule at its base. Outer spine long and haired along distal half. Small spinule near base of outer spine.

Rem.: With (1915) and Sars (1925, as S. persecans describe and illustrate this specis, but they differ in certain details. The posterior corners of prosome are more produced in With’s females and the long outer spine of the P5 extends almost to the distal margin of the 2nd urosomal segment, whereas in Sars’s specimens this spine does not reach the anterior margin of the urosomal segment 2.

Espèce Scottocalanus thori - Planche 11 de figures morphologiquesissued from : B. Morris in J. Fish. Res. Bd Canada, 1970, 27 (12). [p.2314].
Female: Proportional lengths of A1 segments.

Espèce Scottocalanus thori - Planche 12 de figures morphologiquesissued from : B. Morris in J. Fish. Res. Bd Canada, 1970, 27 (12). [p.2315, Fig.9, A-E].
Female: A, A1; B, A2; C, Mx1; D, Mx2; E, Mxp.

Nota: A2 : exopod :endopod ratio of 13 : 10. Endopod bimerous with 2 setae on inner distal margin of endopod segment 1 and with 6 and 8 setae on outer and inner lobes of endopod segment 2. Exopod 7-segmented, with 1 lateral seta on each of exopod segments 2-6 and 3 terminal setae.
Mx1 with 10 spines on gnathobase, 2 setae each on inner lobe 1 and 2, 5 setae on basipodite 2, 7 on endopod, 9 on outer lobe, and 6 on exopod.
Mx2 with 4 setae on inner lobe 1, 3 on inner lobes 2, 3 and 4, a long strong spine on inner lobe 5, and 6 long, slender sensory appendages on endopod.
Mxp as in S. helenae but apparently with only 2 setae plus 1 sensory appendage on proximal of basipod 1.

Ref. compl.:
Roe, 1972 (p.277, tabl.1, tabl.2); Vives, 1982 (p.292); Razouls & al., 2000 (p.343, Appendix); Park & Ferrari, 2009 (p.143, table 5, Appendix 1, as thorii, biogeography)
NZ: 8

Carte de distribution de Scottocalanus thori par zones géographiques
sub-Antarct. (S Australia), Canary Is., off W Cabo Finisterre, Bay of Biscay, Strait of Denmark, off S Iceland, Faroe Is., Maldive Is., Indian, Flores Sea, Philippines, off NE Taiwan, ? Japan, ? N Pacif., off N Hawaii, New Zealand, Chile
N: 13
(5) M: 4,9; (6) F: 5; (7) F: 4,69; M: 5,24; (9) F: 4,8-4,69; M: 5,3-5,24; (38) F: 5,76; (92) F: 4,73-4,47; (199) F: 4,8-4,41; M: 5,28-4,7; (777) M: 4,55-4,51; (1122) M: 4,52; {F: 4,41-5,76; M: 4,51-5,30}
Rem.: méso-bathypélagique.
Sampling depth (sub-Antarct.) : 0-1200 m.
Cette espèce semble avoir été confondue avec S. persecans et S. helenae par divers auteurs (voir synonymies in Vervoort, 1965). Park doute de la validité de certains synonymes. la distribution géographique précise de ces diverses espèces demeure incertaine.
Voir aussi les remarques en anglais
Dernière mise à jour : 06/03/2017

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2023. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur [Accédé le 06 juin 2023]

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