Fiche d'espèce de Copépode
Cyclopoida ( Ordre )
    Corycaeidae ( Famille )
        Corycaeus ( Genre )
            Ditrichocorycaeus ( Sous-Genre )
Corycaeus (Ditrichocorycaeus) dahli  Tanaka, 1957   (F,M)
Syn.: Corycaeus tenuis : Farran, 1911 a (p.291, figs.F);
C. lubbocki : Farran, 1936 a (p.137);
C. (Ditrichocorycaeus) lubbocki : M. Dahl, 1912 (p.64, figs.F,M); Dakin & Colefax, 1940 (p.115, figs.M);
C. (Ditrichocorycaeus) africanus Sewell, 1947 (p.279, figs.F,M);
Ditrichocorycaeus dahli: Boxshall & Halsey, 2004 (p.495); McKinnon & al., 2008 (p.843: Tab.1); Lan Y.-C. & al., 2009 (p.1, Table 2, % vs hydrogaphic conditions); Wi & al., 2013 (p.420, fig.F,M, Rem.)
Ref.:
Tanaka, 1957 (p.89, figs.F,M, Rem.); 1960 (p.79, figs.F, abnormality, Rem.: p.80); Chen & al., 1974 (p.58, figs.F,M); Bradford, 1978 (p.140, Rem.); Zheng & al., 1982 (p.143, figs.F); Chihara & Murano, 1997 (p.964, Pl.213,214: F,M); Al-Yamani & Prusova, 2003 (p.135, figs.F,M); Al-Yamani & al., 2011 (p.114, figs.F,M)
Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 1 de figures morphologiquesissued from : O. Tanaka in J. Fac. Agricult. Kyushu Univ., 1957, 11 (1). [Pl.7, Figs.14-17].
Female (from Japanese waters): 14, habitus (lateral right side); 15, urosome (dorsal); 16, A2; 17, apical spine of exopod of P2 (viewed in two different aspects).
Nota: Anterior segment 1.83 times as long as wide (53:29). The abdominal segments and furca in the proportional lengths 35:23:42; anterior segment 1.83 times as long as wide (53:29). Posterior corners of 3rd thoracic segment extend beyond the middle of genital segment. Genital segment about 1.3 times as long as wide, dorsal surface vaulted, with a folding on the distal 2/3 of the dorsal surface, the ventral surface rather flat. Anal segment 2.6 times as long as it is wide at the distal. Furca divergent, about 16 times as long as it is wide at the distal.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 2 de figures morphologiquesissued from : O. Tanaka in J. Fac. Agricult. Kyushu Univ., 1957, 11 (1). [Pl.8, Figs.1-4].
Male (from Japanese waters): 1, habitus (dorsal); 2, urosome (lateral left side); 3, A2; 4, apical spine of exopd of P2.
Nota: The abdominal segments and furca in the proportional lengths 50:18:32.Genital segment oval in shape, 1.6 times as long as wide (35:21), ventral surface with a small median hook. Furcal rami 8 times as long as wide (25:3).


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 3 de figures morphologiquesissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.280, Fig.70, A-C]. As Corycaeus (Ditrichocorycaeus) africanus.
Female (from Nankauri Harbour, Nicobar Is.): A, last thoracic segments and abdomen (lateral left side); B, A2; C, P4.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 4 de figures morphologiquesissued from : Q.-c Chen & S.-z. Zhang & C.-s. Zhu in Studia Marina Sinica, 1974, 9. [Pl.18, Figs.1-7].
Female (from China Seas): 1, habitus (dorsal); 2, uroome (lateral left side); 3, A2; 4, P4.

Male: 5, habitus (dorsal); 6, urosome (lateral left side); 7, A2.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 5 de figures morphologiquesissued from : F.Y. Al-Yamani & I. Prusova in Common Copepods Northwestern Arabian Gulf : Identification Guide. Kuwait Institute for Scientific Research, 2003. [p.134, Fig.51].
Female: A, habitus (dorsal); B, idem (lateral left side; C, urosome (dorsal); D, idem (lateral right side); E, A2; F, P4.

Nota: Prosome less than twice as long as urosome; 1.7 times urosome.
Proportional lengths of urosomites and caudal rami 30:18:38.
A2 with marginal spine of basipod 2 about 3 times shorter than that of basipod 1.
Genital somite with small ventral hook.
Caudal rami longer than anal somite.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 6 de figures morphologiquesissued from : F.Y. Al-Yamani & I. Prusova in Common Copepods Northwestern Arabian Gulf : Identification Guide. Kuwait Institute for Scientific Research, 2003. [p.136, Fig.52].
Male: G, habitus (dorsal); H, idem (lateral right side); I, urosome (lateral right side); J, A2.
Nota: Proportional lengths of urosomites and caudal rami 28:11:17. A2 with marginal spine of basipod 1 a little longer than that of basipod 2. Terminal spine about 1.4 times as long as basipod 2.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 7 de figures morphologiquesissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.X, Figs.20, 21]. As Corycaeus (Ditrichocorycaeus) lubbockii.
Female: 20, habitus (dorsal); 21, idem (lateral right side).


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 8 de figures morphologiquesissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.X, Fig.25]. As Corycaeus (Ditrichocorycaeus) lubbockii.
Female: 25, A2.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 9 de figures morphologiquesissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.X, Figs.26, 28]. As Corycaeus (Ditrichocorycaeus) lubbockii.
Female: 26, P2 (terminal part of exopod); 28, P4.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 10 de figures morphologiquesissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.X, Figs.22, 23, 24]. As Corycaeus (Ditrichocorycaeus) lubbockii.
Male: 22, habitus (dorsal); 23, idem (lateral right side); 24, A2.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 11 de figures morphologiquesissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.X, Figs.27]. As Corycaeus (Ditrichocorycaeus) lubbockii.
Male: 27, P1 (terminal part of exopod).


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 12 de figures morphologiquesissued from : G.P. Farran in Proc. zool. Soc. Lond., 1911. [Plate XII, Fig.8-9]. As Corycaeus tenuis.
Female (from Christmas Island, Indian):8, 3rd and 4th thoracic segments (mounted); 9, A2.
Nota: Proportional lengths of urosomal segments and caudal rami 14:8:18; measured along the ventral margin the proportions are more nearly 12:10:17. A2 bears a long spine on 1st basal segment and a much shorter spine, 1/3 as long, on the 2nd basal segment; the inner margin of the 2nd basal ends distally in 2 equal to the spine of the 2nd basal. The terminal spine of the exopodite of P2 is very slightly curved.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 13 de figures morphologiquesissued from : Z. Zheng, S. Li, S.J. Li & B. Chen inMarine planktonic copepods in Chinese waters. Shanghai Sc. Techn. Press, 1982 [p.143, Fig.89]
Female): a, habitus (dorsal); b, urosome (lateral, left side); c, A2; d, distal spines of exopod of P2; e, P4.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 14 de figures morphologiquesissued from : Y. Al-Yamani, V. Skryabin, A. Gubanova, S. khvorov & I. Prusova in Marine Zooplankton Practical Guide for the Northwestern Arabian Gulf, 2, 2011. [p.115, Fig.261];
Female (from Kuwait): a-b, habitus (dorsal and left lateral, respectively); c, urosome (left lateral).


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 15 de figures morphologiquesissued from : Y. Al-Yamani, V. Skryabin, A. Gubanova, S. khvorov & I. Prusova in Marine Zooplankton Practical Guide for the Northwestern Arabian Gulf, 2, 2011. [p.115, Fig.262].
Male: a-b, habitus (dorsal and right lateral, respectively); c, urosome (right lateral).


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 16 de figures morphologiquesIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. XXXIV, 5-7].
Female (from 35°09'S, 20°13'E): 5, last thoracic segments and abdomen (dorsal); 6, same (lateral); 7, Abnormal caudal rami from other specimen measuring 1.085 mm.

Nota: Proportional lengths of the cephalothorax and abdomen as 62 to 38.
Abdominal segments and caudal rami in the proportional lengths 33 : 22 : 45 = 100 (ventral view) and 36 : 20 : 44 = 100 (dorsal view).
Genital segment with ventral hook small, directing posteriorly.
Caudal rami straight in lateral view.

Nota male: Cephalothorax and abdomen in the proportional lengths as 57 to 43. Abdominal segments and caudal rami in the proportional lengths 47 : 19 : 34 = 100. Genital segment with a strong ventral hook directing postero-ventrally; the cylindrical part is 1/3 the length of the posterior border of the segment (4 : 11). Anal segment about 1.5 times as long as it is wide at the proximal.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 17 de figures morphologiquesIssued from : J.H. Wi, D.H. Kim & H.Y. Soh Ocean Sci. J., 2013, 48 (4). [p.421, Fig.2]. As Ditrichocorycaeus dahli.
Female (from off W Jeju Island): A, habitus (dorsal); B, urosome; C, caudal rami (caudal setae nimbering using Roman numerals); D, A1; E, A2; F, Md; G, Mx1; H, Mx2; I, Mxp.
Scale bars in µm.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 18 de figures morphologiquesIssued from : J.H. Wi, D.H. Kim & H.Y. Soh Ocean Sci. J., 2013, 48 (4). [p.423, Fig.3]. As Ditrichocorycaeus dahli.
Female: AA, P1; B, P2; C, P3; D, P4.
Scale bar in µm.


Espèce Corycaeus (Ditrichocorycaeus) dahli - Planche 19 de figures morphologiquesIssued from : J.H. Wi, D.H. Kim & H.Y. Soh Ocean Sci. J., 2013, 48 (4). [p.425, Fig.4]. As Ditrichocorycaeus dahli.
Male: A, habitus (dorsal); B, genital somite (lateral); C, A2; D, Mxp; E, P1; F, P2; G, P3; H, P4; I, P5.

Ref. compl.:
Furuhashi, 1966 a (p.295, vertical distribution in Kuroshio region, Table 10); Chen Q-c, 1980 (p.795); Othman & al., 1990 (p.561, 564, Table 1); Hirakawa & al., 1990 (tab.3); Yoo, 1991 (tab.1); Dai & al., 1991 (tab.1); Shih & Young, 1995 (p.76); Hsieh & Chiu, 1998 (tab.2); Noda & al., 1998 (p.55, Table 3, occurrence); Lo al., 2001 (1139, tab.I); Hsieh & al., 2004 (p.398, tab.1); Rezai & al., 2004 (p.490, tab.2, p.495, tab.8); Lan & al., 2004 (p.332, tab.1); Lo & al., 2004 (p.89, tab.1); Zuo & al., 2006 (p.163: tab.1); Hwang & al., 2006 (p.943, tabl. I); Hwang & al., 2007 (p.25); C.-Y. Lee & al., 2009 (p.151, Tab.2); Fazeli & al., 2010 (p.153, Table 1); Zhang G.-T. & Wong, 2011 (p.277, fig.6, 7, abundance, indicator); Kâ & Hwang, 2011 (p.155, Table 3: occurrence %); Hsiao & al., 2011 (p.317, Table 2, indicator of seasonal change); Tseng L.-C. & al., 2011 (p.47, Table 2, occurrences vs mesh sizes); Johan & al., 2012 (2013) (p.1, Table 1); Tseng & al., 2012 (p.621, Table 3: abundance); Johan & al., 2012 (p.647, Table 1, fig.2, salinity range); Jang M.-C & al., 2012 (p.37, Table 3: as C. dahlia, abundance and seasonal distribution); Tseng & al., 2013 (p.507, seasonal abundance); Hwang & al., 2014 (p.43, Appendix A: seasonal abundance)
NZ: 6

Carte de distribution de Corycaeus (Ditrichocorycaeus) dahli par zones géographiques
Loc:
South Africa (Cape of Good Hope), Gulf of Oman, Arabian Gulf (Kuwait), Indian (Nicobar Is, Nankauri Harbour), Christmas Is.), Perai River estuary, Straits of Malacca, Malaysia (Sarawak: Bintulu coast), Hong Kong, China Seas (Yellow Sea, East China Sea, South China Sea), Xiamen Harbour), Taiwan Strait, Taiwan (S, W, SW, NW, N, NE, Mienhua Canyon), S Korea, off W jeju Is., Korea Strait, S Japan (Kuchinoerabu Is.), Japan, Australia (Grreat Barrier, New South Wales, Shark Bay, North West Cape, G. of Carpentaria), E Pacific.
N: 54
Lg.:
(34) F: 1,05-0,98; (66) F: 1,21-1,05; M: 0,985-0,775; (104) M: 0,75; (107) F: 1,08-1,03; M: 0,91-0,89; (109) F: 1-0,85; M: 0,87-0,75; (666) F: 0,97-0,95; M: 0,675; (937) F: 0,97-1,10; M: 0,88-0,93; (1023) F: 1,12; (1152)* F: 1,11-1,15; M: 0,90-0,91; {F: 0,85-1,21; M: 0,68-0,99}
* Total body length in lateral view.
Rem.: Epipelagic.
According to Tanaka (1957, p.90-91) lubbocki M. Dahl, tenuis Farran, africanus Sewell, and the present specimen are synonymous. The author proposes to avoid further confusion to give a new name dahli. The abdominal segments and caudal rami in the proportional lengths 35.2 : 22.5 : 42.3 in lubbocki; 35 : 20 : 45 in tenuis and 35.5 : 22.1 : 42.4 in africanus.
For Boxshall & Halsey (2004, p.491) the subgenus (Dahl, 1912) is considered as full generic status pending phylogenetic revision of the whole family at the generic level.
Dernière mise à jour : 24/12/2016

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