Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Diaptomoidea ( Superfamille )
        Tortanidae ( Famille )
            Tortanus ( Genre )
                Eutortanus ( Sous-Genre )
Tortanus (Eutortanus) derjugini  Smirnov, 1935   (F,M)
Ref.:
Brodsky, 1950 (1967) (p.431, figs.F); Chen & Zhang, 1965 (p.117, 130, figs.F,M); Bowman, 1971 b (p.521); Kos, 1976 (Vol. II, figs.F,M); 1984 (1985) (p.246, figs.F,M, Rem.); Zheng Zhong & al., 1984 (1989) (p.260, Rem., figs.F,M); Ohtsuka, 1992 a (p. 264); Ohtsuka & al., 1992 (p.119, fig.M); Ohtsuka & al., 1995 (p.147, Redescr., figs.F,M, Rem: p.154, comparison between specimens from Japanese, Korean and Chinese waters); Chihara & Omori, 1997 (p.925, Pl.185: F,M); Ohtsuka & Reid, 1998 (p.788, 796: figs.M); Soh & al., 2001 (p.1158, figs. F,M, juv.)
Espèce Tortanus (Eutortanus) derjugini - Planche 1 de figures morphologiquesissued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.53, 2-5].
Female (from E China Sea): 2, habitus (dorsal); 3, P5 (anterior).

Male: 4, habitus (dorsal); 5, P5 (posterior).


Espèce Tortanus (Eutortanus) derjugini - Planche 2 de figures morphologiquesissued from : S. Ohtsuka, Y.H. Yoon & Y. Endo in The J. Oceanol. Soc. Korea, 1992, 27 (2). [p.119, Fig.5 C].
Male: C, exopod segments of right P5 (anterior).


Espèce Tortanus (Eutortanus) derjugini - Planche 3 de figures morphologiquesissued from : S. Ohtsuka & J.W. Reid in J. Crustacean Biol., 1998, 18 (4). [p.796, Fig.11].
Male: B, P5.


Espèce Tortanus (Eutortanus) derjugini - Planche 4 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.149, Fig.1].
Female (from Ariake Sea): A, habitus (dorsal); B, idem (lateral left side); C, prosomal end and urosome (dorsal); D, idem (lateral left side); E, idem (lateral right side); F-K, variability of prosomal end (dorsal); L-O, variability of prosomal end (lateral left side); P-S, variability of prosomal end (lateral right side); T, posterior margin of genital operculum.
W : width; L: length; R: length of right caudal ramus.
Scales in mm.
Nota: Prosome 2.4 times as long as urosome. Cephalosome and 1st pedigerous somite separate, 4th and 5th fused dorsally but separate laterally. Posterior end of last prosomal somite slightly asymmetrical. Urosome 3-segmented, anal somite incompletely coalesced with caudal rami (suture clearly visible in some specimens but not in other ones. Genital double-somite almost as wide as long, genital operculum concave posteromedially; 1st abdominal somite bearing minute dorsal prominence posteriorly; anal somite longest, having low dorsal projection (fig.1C, arrowed). Caudal rami asymmetical, right slightly longer than left.


Espèce Tortanus (Eutortanus) derjugini - Planche 5 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.150, Fig.2].
Female: A, A1; B, A2; C, Md (cutting edge); D-G, variability of central and dorsal teeth on mandibular cutting edge; H, Md (mandibular palp); I, Md (exopod, setae omitted); J, Mx1.
Scales in mm.
Nota: 1st central tooth on mandibular cutting edge variable in shape, tri- or bicusped at tip; five exopodsegments of Md almost coalescent, with 3 rows of minute spinules.


Espèce Tortanus (Eutortanus) derjugini - Planche 6 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.151, Fig.3].
Female: A, Mx2; B, Mxp.
Scales in mm.


Espèce Tortanus (Eutortanus) derjugini - Planche 7 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.152, Fig.4].
Female (from Ariake Sea): A, P1 (anterior); B, P2 (anterior); C, endopod of P2 (setae omitted); D, P3 (anterior); E, P4 (anterior); F, P5 (anterior); G-H, variability of right exopod of P5. R: length of right ramus; L: length of left ramus.
Scales in mm.


Espèce Tortanus (Eutortanus) derjugini - Planche 8 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.153, Fig.5].
Male (from Ariake Sea): A, habitus (dorsal); B, prosomal end and 1st and 2nd urosomel somites (lateral left side); C, idem (lateral right side); D, urosome (ventral); E, right A1; F, P5 (anterior); G, terminal exopod segment of left P5.
Scales in mm.


Espèce Tortanus (Eutortanus) derjugini - Planche 9 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.154, Fig.6].
Male (from Ariake Sea): A, B, right exopod of P5; C, D, terminal exopod segment of left P5.
Scales in mm.


Espèce Tortanus (Eutortanus) derjugini - Planche 10 de figures morphologiquesissued from : S. Ohtsuka, H. Ueda & G.-S. Lian in Bull Plankton Soc. Japan, 1995, 42 (2). [p.155, Fig.7].
Female: A, : from Ariake Sea; B, from Xiamen; C-E, from Gwang Yang Bay.
A-C: urosome (dorsal; low prominence on anal somite arrowed); D, urosome with spermatophore on genital double-somite (lateralright side); E, idem (dorsal).
Scales in mm.


Espèce Tortanus (Eutortanus) derjugini - Planche 11 de figures morphologiquesIssued 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.432, Fig.305].
Female (from Sea of Japan): habitus (dorsal and lateral left side); S5, P5.
Nota: A comparison of specimens from the Sea of Japan with those from the Sea of Okhotsk reveals a difference in size and in the absence of denticles from the posterior margin of the genital segment in specimens from the Sea of Japan.

Male: habitus (dorsal); S5, P5.


Espèce Tortanus (Eutortanus) derjugini - Planche 12 de figures morphologiquesH.Y. Soh, H.-L Suh, S. Ohtsuka, Y.O. Yoon & S.D. Choi in J. Plankton Res., 2001, 23 (10). [p.1158, Fig.1].
Female (from Mankyung & Dongjin Rivers, W Korea): A, habitus (dorsal); B, idem (lateral left side); E, P5.


Espèce Tortanus (Eutortanus) derjugini - Planche 13 de figures morphologiquesH.Y. Soh, H.-L Suh, S. Ohtsuka, Y.O. Yoon & S.D. Choi in J. Plankton Res., 2001, 23 (10). [p.1159, Fig.2].
Male: A, habitus (dorsal); B, C, left side and right side respectively; F, P5; G, distal exopodal segment of left P5 [l = left leg; r = right leg; S 1-3 = lateral spines 1-3; Si 1-3 = inner setae 1-3; St = terminal spine.


Espèce Tortanus (Eutortanus) derjugini - Planche 14 de figures morphologiquesIssued from : M.S. Kos in Issled. Fauny Morei, 1984 (1985), 30 (38). [p.250, Fig.15].
Male (from South Sakhalin Islands): 1, habitus (dorsal); 2, A1; 3, abdomen (dorsal); 4, P5.


Espèce Tortanus (Eutortanus) derjugini - Planche 15 de figures morphologiquesIssued from : M.S. Kos in Issled. Fauny Morei, 1984 (1985), 30 (38). [p.249, Fig.14].
Female (from South Sakhalin Islands): 1, habitus (dorsal); 2, abdomen (dorsal); 3, Mxp; 4, P1; 5, P2; 6, P4; 7, P3; 8, P5.

Ref. compl.:
Chen Q., 1983 (p.133); Dai & al., 1991 (tab.1); Myung & al., 1994 (tab.1); Shih & Young, 1995 (p.74); Ohtsuka & al., 1995 (p.159); Marcus, 1996 (p.144, as derjugunii); Mauchline, 1998 (tab.40); Bragina, 1999 (p.196); Choi & al., 2005 (p.710: Tab.III); Ohtsuka & al., 2008 (p.115, Table 6); Sakaguchi & al., 2011 (p.18, Table 1, 2, occurrences); Suzuki, K.W. & al., 2013 (p.15, Table 2, 3, 4, estuaries, annual occurrence);
NZ: 3

Carte de distribution de Tortanus (Eutortanus) derjugini par zones géographiques
Espèce Tortanus (Eutortanus) derjugini - Carte de distribution 2issued from : S. Ohtsuka, Y.H. Yoon & Y. Endo in The J. Oceanol. Soc. Korea, 1992, 27 (2). [p.120, Fig.6].
Schematic illustration of distribution patterns of five sepecies of the subgenus Eutortanus.
Espèce Tortanus (Eutortanus) derjugini - Carte de distribution 3issued from : H. Itoh, S. Ohtsuka & T. Sato in Plankton Biol. Ecol., 2001, 48 (1); [p.66, Fig.6].
horizontal distribution of species of the subgenus Tortanus (Eutortanus) around the Japan Sea, redrawn after Ohtsuka (1999); current system modified from Uda (1934).
In T. terminalis and T. komachi symbol indicates collected site, whereas in others the distributions are schematically exhibited.
The speciation of the six known species might have occured in the ancient East China Sea Gulf with low salinity water during the Middle Miocene to the Pleistocene, and relatively recently members of the subgenus may have secondarily expanded their distributions in the neighboring waters of the East China Sea.
Espèce Tortanus (Eutortanus) derjugini - Carte de distribution 4Issued from : K.W. Suzuki, K. Nakayama & M. Tanaka in J. Oceanogr., 2011, 69. [p.23, Fig.5].
Bubble plots of densities of the semi-endemic calanoid Tortanus derjugini in relation to temperature, salinity, and turbidity observed in the Chikugo River estuary (south Japan) in 2005 and 2006.
Loc:
China Seas (Bohai Sea, Yellow Sea, East China Sea, South China Sea, Xiamen Harbour), Korea, Ariake Sea, Asan Bay, Japan (south estuaries: Chikugo, Midori & Kuma Rivers), Japan Sea, Okhotsk Sea, S Kuril Is.
N: 22
Lg.:
(22) F: 1,93-1,71; 2,26-2,03; M: 1,65-1,4; 1,97-1,81; (290) F: 2-2,3; M: 1,8-2; (640) F: 2,36; 2,35; 2,16; 2,06-1,94; M: 2,09; 1,98; 2,04; 1,71; (643) F: 1,82; (831) F: 1,85-1,73; M: 1,69-1,4; (1221) M: 1,70-1,82; {F: 1,71-2,36; M: 1,40-2,09}
Rem.: côtier, estuaire.
Observé dans les ballasts des navires à San Francisco.
Voir aussi les remarques en anglais
Dernière mise à jour : 09/04/2020

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2020. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 01 décembre 2020]

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