Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Euchaetidae ( Famille )
            Euchaeta ( Genre )
Euchaeta plana  Mori, 1937   (F,M)
Syn.: Euchaeta murrayi Sewell, 1947 (p.117, figs.F); 1948 (p.429); Gaudy, 1963 b (p.13); Silas, 1972 (p.646); Hernandez-Trujillo & Esqueda-Escarcega, 2002 (in Appendix) ; Kazmi, 2004 (p.229);
Paraeuchaeta plana : Bradford & al.,1983 (p.23); Chihara & Murano, 1997 (p.801, Pl.107,111: F,M); Shimode & Shirayama, 2004 (tab.2); Choi & al., 2005 (p.710: Tab.III); Ohtsuka & al., 2008 (p.115, Table 5)
Ref.:
Mori, 1937 (1964) (p.46, figs.F,M); Chiba, 1953 a (p.615, figs.M); Chiba & al., 1957 (p.308); 1957 a (p.11); Tanaka, 1958 (p.329, figs.F,M); Chen & Zhang, 1965 (p.55, figs.F,M); Furuhashi, 1966 a (p.295, vertical distribution in Kuroshio region, Table 10) ; Tanaka & Omori, 1968 (p.221, figs.F); Kos, 1972 (Vol. I, figs.F,M, Rem.); Tanaka, 1973 (p.137, Rem.); Chen & Shen, 1974 (p.125, 127, figs.M); Park, 1995 (p.21, Redescr. F,M, figs.F,M); Mulyadi, 2004 (p.74, figs.F, Rem.); Jeong & al., 2011 (p.117, 125, figs.F,M, Rem.: genital aperture); Soh & al., 2013 (p;27, figs.F,M); Ohtsuka & al., 2015 (p.123, Table 2).
Espèce Euchaeta plana - Planche 1 de figures morphologiquesissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.121, Fig.11].
Female: a, forehead (left side); b, urosome (left); c, d, e, f, genital somite (left, dorsal, right, ventral, respectively); g, idem (ventral, tilted counterclockwise); h, P1 (anterior); i, P2 (anterior).
laterally, dorsal margin of forehead only slightly arched. Frontal eminence highly pronounced, conical. Rostrum elongate, slightly curved backward pointing in an anteroventral direction.
Dorsally, genital somite asymmetrical, with a rounded swelling just anterior to middle on left side and with a low angular ridge at middle of right side. Ventrally, genital field strongly asymmetrical with 2 genital flanges appearing very different from each other and right side of genital field deeply emarginate. When the somite is tilted counterclockwise, however, 2 genital flanges look quite similar. Laterally, 2 genital flanges also appear similar with rounded margin. Genital prominence very characteristic with a long, gradually sloping anterior margin and a short posterior margin which is perpendicular to ventral wall of somite.
All cephalosomal appendages similar to those of E. concinna except that 1st inner lobe of Mx1 with 1+9+1 setae (as in E. marina).
Swimming legs similar to those of E. concinna. 2nd outer spine of P2 exopod, however, short of reaching distal end of following outer spine.

Male: j, forehead (left); k, last pedigerous and genital somites (left); l, exopod of left 5th leg (medial); m, idem (anterior, tilted clockwise); n, serrated lamella (lateral).


Espèce Euchaeta plana - Planche 2 de figures morphologiquesissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1968, XVI (4). [p.222, Fig.1].
Female (small form): A, forehead (lateral); B, last thoracic segment and urosome (lateral left side); C, last thoracic segment and genital somite (lateral right side); D, genital somite (ventral); E, Mx1; F, inner lobe 1 of Mx1; G, Mx2; H, Mxp; I, exopod of P2; J, endopod of P2; K, P1.
Nota: The urosome segments and furca are in the proportional lengths as 47:21:15:4:13 = 100.


Espèce Euchaeta plana - Planche 3 de figures morphologiquesissued from : O. Tanaka & M. Omori in Publs Seto Mar. Biol. Lab., 1968, XVI (4). [p.223, Fig.2].
Female (large form): A, forehead (lateral); B, last thoracic segment and genital somite (lateral right side); C, last thoracic segment and urosome (lateral left side); D, genital somite (ventral).
Nota: The urosome segments and furca are in the proportional lengths as 45:21:18:4:12 = 100.


Espèce Euchaeta plana - Planche 4 de figures morphologiquesIssued from : O. Tanaka in Publs Seto mar. Biol. Lab., 1958, VI (3). [p.329, Fig.62].
Female: a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and genital segment (lateral left side); d, idem (dorsal); e, outer margin of exopod of P2 .
Male: f, forehead (lateral); g, 2nd segment of exopod of left P5.


Espèce Euchaeta plana - Planche 5 de figures morphologiquesissued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.16, 1-7].
Female (from E China Sea): 1, habitus (dorsal); 2, forehead (lateral); 3, genital segment (lateral right side); 4, shape of genital complex (ventral); 5, outer marginal spines of 2nd and 3rd exopodal segments of left P2 (posterior).

Male: 6, habitus (dorsal); 7, 2nd exopodal segment of left P5 (posterior).


Espèce Euchaeta plana - Planche 6 de figures morphologiquesissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.118, Fig.26]. As Euchaeta murrayi.
Female (from N Arabian Sea): A, habitus (dorsal); B, genital segment (lateral left side); C, idem (another aspect); D, idem (ventral); E, Mx1; F, Mx2; G, basal segment of Mxp; H, P1; I, P2.
Nota: The proportional lengths of the cephalothorax and abdomen as 71 to 29. The proportional lengths of the various segments of the body (cephalon to caudal rami) as 330:135:59:56:59:140:77:77:21:46 = 1000. Genital segment rather sparsely covered with short hairs on the dorsal aspect, and the dorsal part of the posterior margin is fringed with a row of small spinules; the genital aperture is bounded by, on the left side, a prominent rounded lamella, that commences at about the middle of the segment and is continued backwards and across the segment behind the vulva; on the right side is a smaller lappet. 2nd and 3rd urosomal segments covered both dorsally and ventrally with numerous short hairs, and a few longer hairs on the ventral aspect of the 3rd segment. Caudal rami with a number on short hairs on the ventral aspect. A1 23-segmented (segments 8-9 and 24-25 fused, 12-13 partly fused) reaches back to about the middle of the abdomen. In A2 the basal 1st segment is provided with a row of hairs on the inner aspect, the two rami approximately equal length; the terminal endopodal segment with 6 and 7 setae on the two lobes. In Mx1 the vaious lobes bear: outer lobe 1 (5 setae), inner lobe (10), inner lobe 2 (or 3) (1 ); basipodal segment 2 (1 long and 2 short setae; endopod 1 (no seta), endopod 2-3 (1 + 3 setae. In Mx2 one of the spines, out of six, arising from the terminal lobe, presents the characteristic lateral spinules.


Espèce Euchaeta plana - Planche 7 de figures morphologiquesissued from : Q.-c Chen & C.-j. Shen in Studia Marina Sinica, 1974, 9. [p.128, Figs.9-12].
Male: 9, last thoracic segments and urosome (dorsal); 10, forehead (lateral); 11, P5; 12, exopod of left P5 (medial).


Espèce Euchaeta plana - Planche 8 de figures morphologiquesissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (2nd edit., 1964). [Pl.21, Figs.1-8].
Female: 1, 8, habitus (lateral and dorsal, respectively); 2, P2; 7, genital area.

Male: 3, forehead (lateral); 4, distal portion exopodite of left P5: 5, habitus (dorsal); 6, P5.


Espèce Euchaeta plana - Planche 9 de figures morphologiquesissued from : M.-K. Jeong, H.-L. Suh & H.Y. Soh in Ocean Sci., 2011, 46 (2). [p.126, Fig.6].
Female (E Korea): A-B, habitus (dorsal and lateral, respectively); C, genital double-somite; D, A1.

Male: E-F, habitus (dorsal and lateral, respectively); G, P5; H, 2nd exopodal segment of left P5; I, A1.

Scale bars in micrometers.


Espèce Euchaeta plana - Planche 10 de figures morphologiquesissued from : O. Tanaka in I O B C Handbook, 1973, IV. [p.148, Fig.9: 7].
Female: 7, 2nd outer marginal spine of exopod of P2.

Nota: This 2nd marginal spine short.


Espèce Euchaeta plana - Planche 11 de figures morphologiquesissued from : Mulyadi in Published by Res. Center Biol., Indonesia Inst. Sci. Bogor, 2004. [p.74, Fig.42].
Female (from 07°29'S, 121°05'E): a, habitus (dorsal); b, forehead (lateral); c, posterior part of last thoracic segment and genital complex (lateral right side); d, P1; e, P2.


Espèce Euchaeta plana - Planche 12 de figures morphologiquesEuchaeta plana Female:
1 - See Key to concinna species Group.
2 - Dorsally, genital somite nearly symmetrical (Fig.11-d).


Espèce Euchaeta plana - Planche 13 de figures morphologiquesIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.28, Fig.12].
Female (from Korean waters): A-B, habitus (dorsal and lateral, respectively); C, A1.
Scale bars: 500 µm.


Espèce Euchaeta plana - Planche 14 de figures morphologiquesIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.29, Fig.13].
Female: A, P1; B, P2; C, last thoracic segment and genital segment (dorsal); D-E, genital segment and part of 2nd urosomal segment (right and left sides, respectively).
Scale bars: 200 µm.


Espèce Euchaeta plana - Planche 15 de figures morphologiquesIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.30, Fig.14].
Male: A-B, habitus (dorsal and lateral, respectively); C, A1.
Scale bars: A-B = 500 µm; C = 200 µm.


Espèce Euchaeta plana - Planche 16 de figures morphologiquesIssued from : H.Y. Soh, S.Y. Moon & J.H. Wi in Invertebrate Fauna of Korea (eds) Incheon: NIBR, 2013, 21 (28). [p.31, Fig.15].
Male: A, P1; B, P2; C, forhead (lateral); D, last thoracic segment and genital segment (lateral); E, P5; F, distal segments of left P5.
Scale bars: 200 µm.

Ref. compl.:
Yamazi, 1958 (p.149, Rem.); Delalo, 1968 (p.137); Uye S-i., 1982 (p.149, relation length-weight-C-N); Madhupratap & Haridas, 1986 (p.105, tab.1); Hernandez-Trujillo, 1989 a (tab.1); Cervantes-Duarte & Hernandez-Trujillo, 1989 (tab.3); Yoo, 1991 (tab.1); Dai & al., 1991 (tab.1); Hirakawa & al., 1995 (tab.2); Shih & Young, 1995 (p.70); Park & Choi, 1997 (Appendix); Hsieh & Chiu, 1998 (tab.2); Padmavati & al., 1998 (p.349); Palomares Garcia & Vera, 1995 (tab.1); Suarez-Morales & Gasca, 1998 a (p.109); Noda & al., 1998 (p.55, Table 3, occurrence); Mauchline, 1998 (tab.33, 35, 36); Hsieh & al., 2004 (p.397, tab.1); Lan & al., 2004 (p.332, tab.1); Wang & Zuo, 2004 (p.1, Table 2, dominance, origin); Prusova & Smith, 2005 (p.77); Zuo & al., 2006 (p.162: tab.1); Hwang & al., 2006 (p.943, tabl. I); Dur & al., 2007 (p.197, Table IV); Fernandes, 2008 (p.465, Tabl.2); Ayon & al., 2008 (p.238, Table 4: Peruvian samples); Lan Y.C. & al., 2008 (p.61, Table 1, % vs stations); Tseng L.-C. & al., 2008 (p.153, Table 2, fig.5, occurrence vs geographic distribution, indicator species); Sun & al., 2010 (p.1006, Table 2); W.-B. Chang & al., 2010 (p.735, Table 2, abundance); Maiphae & Sa-ardrit, 2011 (p.641, Table 2); Zhaoli & al., 2011 (p.84, abundance %); Chen H; & al., 2011 (p.84, spatial & temporal variations); Tseng & al., 2012 (p.621, Table 3: abundance); Jang M.-C & al., 2012 (p.37, abundance and seasonal distribution); Huo & al., 2012 (p.1, Table 1: dominance); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Tachibana & al., 2013 (p.545, Table 1, seasonal change 2006-2008); Hwang & al., 2014 (p.43, Appendix A: seasonal abundance)
NZ: 8

Carte de distribution de Euchaeta plana par zones géographiques
Loc:
Red Sea, G. of Oman, Arabian Sea, Indian (equatorial), Bay of Bengal, Indonesia-Malaysia, Flores Sea, China Seas (Yellow Sea, East China Sea, Changjiang River estuary, South China Sea, Xiamen Harbour), Taiwan (S, SW, E, NW, NE), S & E Korea, Korea Strait, Japan Sea, Tsushima Straits, Japan (Kuchinoerabu Is., Inland Sea, Izu, Tokyo Bay, Tanabe Bay), Bikini Is., W Baja California, Peru
N: 56
Lg.:
(3) F: 3,3-3,1; M: 3,16-2,84; (11) F: 2,78-2,58; (63) F: 2,95-2,85 and 3,45-3,19; (91) F: 3,1-3; (98) F: 2,77-2,69; M: 2,9-2,75; (99) F: 3,38-2,87; M: 2,95-2,75; (290) F: 3,25-3,5; M: 2,9-3,05; (1106) F: 2,90-3,18; M: 2,51-2,63; (1122) F: 3,1; (1174) F: 2,9-3,18; M: 2,51-2,63; {F: 2,58-3,50; M: 2,51-3,16}

The mean female size is 3.049 mm (n = 19; SD = 0.2611), and the mean male size is 2.844 mm (n = 10; SD = 0.1929). The size ratio (male : female) is 0.922 (n = 5; SD = 0.0719), or ± 92 %. In samples, the sex ratio is 2.2.
Rem.: La présence de cette espèce en Basse Californie nécessite confirmation.
Observé dans les ballasts des navires à San Francisco.
Voir aussi les remarques en anglais
Dernière mise à jour : 15/04/2020

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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2020. - Diversité et répartition géographique chez les Copépodes planctoniques marins. Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 28 septembre 2020]

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