Species Card of Copepod
Cyclopoida ( Order )
    Corycaeidae ( Family )
        Corycaeus ( Genus )
            Ditrichocorycaeus ( Sub-Genus )
Corycaeus (Ditrichocorycaeus) subtilis  M. Dahl, 1912   (F,M)
Syn.: Ditrichocorycaeus subtilis : Boxshall & Halsey, 2004 (p.494); McKinnon & al., 2008 (p.843: Tab.1); Vives & Shmeleva, 2010 (p.220, figs.F,M, Rem.); Wi & al., 2013 (p.430, figs.F,M, Rem.)
Ref.:
M. Dahl, 1912 (p.80, figs.F,M); Früchtl, 1924 b (p.101); Sewell, 1933 (p.30); Farran, 1936 a (p.138); Tanaka, 1957 (p.88, figs.F); 1960 (p.82, figs.F,M); Chen & al., 1974 (p.59, figs.F); Boxshall & Halsey, 2004 (p.494)
Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 1 of morphological figuresissued from : O. Tanaka in J. Fac. Agricult. Kyushu Univ., 1957, 11 (1). [Pl.7, Figs.1-4].
Female (from Japanese waters): 1, habitus (lateral right side); 2, urosome (dorsal); 3, A2; 4, apical spine of exopod of P2.
Nota: The abdominal segments and furca in the proportional lengths 44:26:30. Wing-like expansions of 3rd thoracic segment not extending to the middle of genital segment. Processes of posterior corners of 4th thoracic segment very small.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 2 of morphological figuresissued from : Q.-c Chen & S.-z. Zhang & C.-s. Zhu in Studia Marina Sinica, 1974, 9. [Pl.18, Figs.8-12].
Female (from China Seas): 8, habitus (dorsal); 9, idem (lateral left side); 10, A2; 11, terminal spines of exopod of P2; 12, P4.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 3 of morphological figuresissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.VIII, Figs.8a, 9, 10].
Female: 8a, habitus (dorsal); 9, urosome (dorsal); 10, habitus (lateral left side).


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 4 of morphological figuresissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.VIII, Fig.13].
Female: 13, A2.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 5 of morphological figuresissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.VIII, Figs.14, 16].
Female: 14, P2 (distal part ofexopod 3); 16, P4.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 6 of morphological figuresissued from : M. Dahl in Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. Bd II, G. f1. I. Die Corycaeinen 1912. [Taf.VIII, Figs.11, 12, 15].
Male: 11, habitus (dorsal); 12, idem (latral right side); 15, A2.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 7 of morphological figures[B & H] Female: Small species. Caudal ramus just longer than anal somite. Ventral hook of genital double-somite weak; produced ventral margin of genital double-somite almost rectangular in lateral view.
Male: Genital somite only as long as anal somite and caudal rami combined.

[V & S] Female: Posterior points of thoracic segment 3, in dorsal view, scarcely reacing half genital segment. Spine of basipodite 2 of A2 less than half of spine of basipodite 1.
Male: Posterior points of thoracic segment 3, in dorsal view, shorter than 2/3 genital segment. Genital segment length scarcely shorter than caudal rami. Genital segment 1.5 times longer than caudal rami.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 8 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. XXXVI, 1-3].
Female (from 35°09'S, 20°13'E): 1, last thoracic segments and abdomen (lateral).
Nota : Cephalothorax and abdomen in the proportional lengths 69 to 31.
Head separates from the 1st thoracic segment, but the line of demarcation is very feeble.w
Wing-like expansion of the 3rd thoracic segment extends only to the level of the proximal 1/5 of the genital segment.
4th thoracic segment ends into short pointed processes.
Abdominal segments and caudal rami in the proportional lengths 45 : 27 : 28 = 100.
Proximal part of the genital segment dilated, without ventral hook.
Anal segment 1.4 times as long as it is broad at the anterior border.
Caudal rami slightly divergent, 3/5 times as long as it is broad at the proximal

Male (from 35°09'S, 20°13'E): 2, habitus (dorsal); 3, last thoracic segments and abdomen (lateral).
Cephalothorax and abdomen in the proportional lengths 60 to 40.
Abdominal segments and caudal rami in the proportional lengths 47 : 23 : 30 = 100.
Genital segment elongate ovate, 1.8 times as long as it is broad at the middle section.
Anal segment about 1.9 times as long as it is broad at the posterior border.
Caudal rami about 4/3 times as long as it is broad at the proximal.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 9 of morphological figuresIssued from : J.H. Wi, D.H. Kim & H.Y. Soh Ocean Sci. J., 2013, 48 (4). [p.432, Fig.8]. As Ditrichocorycaeus subtilis.
Female (from off W jeju): A-B, habitus (dorsal and lateral, respectively); C, A2; D, Mx1; E, Mxp.
Scale bars in µm.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 10 of morphological figuresIssued from : J.H. Wi, D.H. Kim & H.Y. Soh Ocean Sci. J., 2013, 48 (4). [p.434, Fig.9]. As Ditrichocorycaeus subtilis.
Female: A, P1; B, P2; C, P3; D, P4.
Qxale bar in µm.


Species Corycaeus (Ditrichocorycaeus) subtilis - Plate 11 of morphological figuresIssued from : J.H. Wi, D.H. Kim & H.Y. Soh Ocean Sci. J., 2013, 48 (4). [p.435, Fig.10]. As Ditrichocorycaeus subtilisi.
Male : A, habitus (dorsal); B, genital somite (lateral); C, A2; D, Mxp; E, exopod of P1; F, exopod of P2; G, exopod of P3; H, P4.

Compl. Ref.:
Sewell, 1948 (p.420); C.B. Wilson, 1950 (p.196); De Decker, 1964 (p.15, 21, 27); Kovalev & Shmeleva, 1982 (p.86); Greze & al., 1985 (p.8); Othman & al., 1990 (p.561, 564, Table 1); Kimmerer, 1993 (tab.2); Shih & Young, 1995 (p.76); Noda & al., 1998 (p.55, Table 3, occurrence); Hsieh & Chiu, 1998 (tab.2); Hsieh & al., 2004 (p.398, tab.1); Rezai & al., 2004 (p.490, tab.2); Lo & al., 2004 (p.89, tab.1); McKinnon & al., 2008 (p.848: Tab. IV); Johan & al., 2012 (p.647, Table 1, fig.2, salinity range)
NZ: 8

Distribution map of Corycaeus (Ditrichocorycaeus) subtilis by geographical zones
Loc:
South Africa (SE), Medit. (Alboran Sea), Zanzibar, Madagascar (Nosy Bé), Malaysia (Kurau Riv.), Perai River estuary (Penang), Straits of Malacca, Aru Is., Bismarck Archipelago, China Seas (East China Sea, South China Sea), Taiwan, Mienhua Canyon, S Korea (off W jeju Is.), S Japan (Kuchinoerabu Is.), Japan (very rare), Hawaii, California (Tomales Bay), Australia (Great Barrier, North West Cape, G. of Carpentaria)
N: 25
Lg.:
(34) F: 0,82-0,72; (66) F: 0,79-0,765; M: 0,7; (107) F: 0,76; (109) F: 0,8-0,72; (666) F: 0,77-0,75; M: 0,7-0,68; (786) M: 0,82; (1152)* F: 0,78-0,80; M: 0,73-0,734; {F: 0,72-0,82; M: 0,68-0,82}
* Total body lengyh in lateral view.
Rem.: Epiplanktonic. 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 : 04/12/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed September 22, 2021]

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