Species Card of Copepod
Cyclopoida ( Order )
    Corycaeidae ( Family )
        Corycaeus ( Genus )
            Ditrichocorycaeus ( Sub-Genus )
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)
Species Corycaeus (Ditrichocorycaeus) dahli - Plate 1 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 2 of morphological figuresissued 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).


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 3 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 4 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 5 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 6 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 7 of morphological figuresissued 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).


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 8 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 9 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 10 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 11 of morphological figuresissued 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).


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 12 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 13 of morphological figuresissued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 14 of morphological figuresissued 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).


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 15 of morphological figuresissued 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).


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 16 of morphological figuresIssued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 17 of morphological figuresIssued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 18 of morphological figuresIssued 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.


Species Corycaeus (Ditrichocorycaeus) dahli - Plate 19 of morphological figuresIssued 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.

Compl. Ref.:
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

Distribution map of Corycaeus (Ditrichocorycaeus) dahli by geographical zones
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.
Last update : 24/12/2016
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