Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Temoridae ( Family )
            Eurytemora ( Genus )
Eurytemora pacifica  Sato, 1913   (F,M)
Syn.: E. johanseni Willey, 1920 (p.13, figs.F,M); Légaré, 1957 (p.537)
Ref.:
Smirnov, 1931 (p.199, fig.M); Brodsky, 1950 (1967) (p.281, figs.F,M); Chiba, 1956 (p.25, figs.F,M, juv., N); M.W. Johnson, 1961 (p.317, figs.F, Rem.); Heron, 1964 (p.209, Rem.); Chen & Zhang, 1965 (p.66, figs.F,M); Shih & al., 1971 (p.153, 208); Kos, 1976 (Vol. II, figs.F,M); Heron & Damkaer, 1976 (p.128, 128, 129, Table 1: synonymy, 2: ratio anal segment/uropods); Kos, 1977 a (p.27, Rem.F,M, figs.F,M); Gardner & Szabo, 1982 (p.318, figs.F,M); Dussart & Defaye, 1983 (p.49); Kos, 1984 (1985) (p.228, Rem.); Zheng Zhong & al., 1984 (1989) (p.242, figs.F,M); Chihara & Murano, 1997 (p.917, Pl.181: F,M); Dodson & al., 2010 (p.653, table 2, fig.4, 5, 6, key Female: p.146); Brylinski & al., 2016 (in press)
Species Eurytemora pacifica - Plate 1 of morphological figuresissued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.21, 5-9].
Female (from E China Sea): 5, habitus (dorsal); 6, left P5 (posterior); 7, right P5 (posterior).

Male: 8, habitus (dorsal); 9, P5 (posterior).


Species Eurytemora pacifica - Plate 2 of morphological figuresIssued 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.282, Fig.190].
Female (from NW Pacif.): habtus with egg sec (dorsal); posterior thoracic segment and urosome; S5, P5.

Male: habitus (dorsal); S5, P5.


Species Eurytemora pacifica - Plate 3 of morphological figuresissued from : G.A. Heron in Crustaceana, 1964, 7 (3). [p.203, Fig.9].
Male (from Kivalina Lagoon, Marryatt Inlet, NW Alaska): 9, right A1 (segments 8-13 with detail of spines).


Species Eurytemora pacifica - Plate 4 of morphological figuresissued from : M.W. Johnson in pacif. Sci., 1961, 15 (3). [p.318, Figs.7-8].
Female (from Alaska coast): 7, habitus with eggs and spermatophore (lateral); 8, lateral outline of 5th thoracic segment occuring in some adults.


Species Eurytemora pacifica - Plate 5 of morphological figuresissued from : M.W. Johnson in pacif. Sci., 1961, 15 (3). [p.320, Figs.9-10].
Female: 9, P5.

Male: 10, P5.


Species Eurytemora pacifica - Plate 6 of morphological figuresIssued from : A. Willey in Rep. Can. Arct. Exp. 1913-18, 1920, VII, Part K. [p.13K, Fig.5]. As Eurytemora johanseni.
Female (from 68°30'N, 166°32'W): Dorsal view of hind-body.


Species Eurytemora pacifica - Plate 7 of morphological figuresIssued from : A. Willey in Rep. Can. Arct. Exp. 1913-18, 1920, VII, Part K. [p.13K, Fig.6]. As Eurytemora johanseni.
Female: P5.


Species Eurytemora pacifica - Plate 8 of morphological figuresIssued from : A. Willey in Rep. Can. Arct. Exp. 1913-18, 1920, VII, Part K. [p.14K, Figs.7, 9]. As Eurytemora johanseni.
Male: 7, distal segments of right A1; 9, spine on the 12th segment.


Species Eurytemora pacifica - Plate 9 of morphological figuresIssued from : A. Willey in Rep. Can. Arct. Exp. 1913-18, 1920, VII, Part K. [p.14K, Figs.11, 12]. As Eurytemora johanseni.
Male: 11, basis of left P5; 12, P5 (posterior view)


Species Eurytemora pacifica - Plate 10 of morphological figuresIssued from : A. Willey in Rep. Can. Arct. Exp. 1913-18, 1920, VII, Part K. [p.15K, Fig.13]. As Eurytemora johanseni.
Male: 13, abnormal caudal rami.


Species Eurytemora pacifica - Plate 11 of morphological figuresIssued from : M. Chihara & M. Murano in An Illustrated Guide to Marine Plankton in Japan, 1997. [p.919, Pl. 181, fig.285 a-b].
Female : a, habitus (dorsal); b, P5; c, P1.
Note characteristics numbered 1, 2, 3 into circles.


Species Eurytemora pacifica - Plate 12 of morphological figuresIssued from : M. Chihara & M. Murano in An Illustrated Guide to Marine Plankton in Japan, 1997. [p.919, Pl. 181, fig.285 a-b].
Male : a, habitus (dorsal); b, P5.
Note characteristics numbered 1, 2, 3 into circles.


Species Eurytemora pacifica - Plate 13 of morphological figuresIssued from : J.-M. Brylinski, L. Courcot, V. David & B. Sautour inBioinv. Rec., 2016, 5. [Fig.2].
Eurytemora pacifica (from Marennes-Oléron Bay, France) (morphological specifications, SEM): A, winged female (ventral view); B, wingless female; E, P5 (posterior view); F, posterior end of thorax and urosome with egg sac of winged female; G, same of winless female.
w = ''wing''; e = egg; es = egg-sac; sp = spermatophore; go = gonopore, th5 = last thoracic somite.

Nota: Rostrum bifurcate with 2 filaments.
- Metasome segments not fused; - Back corners of the last metasome segment with wing-like growth (''winged''), which reach almost to the end of the genital segment. Some female specimens without ''wings'' (wingless).
- Urosome 3-segmented
- Genital double-somite widen in the sides, as long as either of the 2 next segments. Genital antrum armed with 3 thorns and a gutter for spermatophore placement, covered by a central mobile triangular operculum.
- Caudal rami not longer than the 3rd abdominal segment, slightly shorter left.
- P5 asymmetrical, uniramous, 3-segmented; segment 2 with 2 lateral spines anfd inner stout serrated process directed distally, parallel to leg axis, this process as long as segment 3 and forming pliers with this one. Distal segment armed with 1 subterminal and 1 apical spine; inner side with numerous setules. Asymmetry is evident in the length of the distal segment and the inner process of the segment 2. In the right leg, the process is shorter with 5-6 teeth, the distal segment is shorter, and the terminal spine almost as long as the last two segments. In the left leg, the process is longer with 7-8 teeth, the terminal segment is bigger and the terminal spine is shorter than the terminal segment.


Species Eurytemora pacifica - Plate 14 of morphological figuresIssued from : J.-M. Brylinski, L. Courcot, V. David & B. Sautour in Bioinv. Rec., 2016, 5. [Fig.2].
Eurytemora pacifica (morphological specifications, SEM): H, Male (ventral view); I, male P5 (anterior face); J, extremity of left P5 (anterior view).
bp = bludgeon process.

Nota: Back corners of the last metasome segment without wing-like processes.
- Right A1 geniculate; 1 spine on the segments 8, 9 and 12.
- Urosome 5-segmented.
Caudal rami equal in length to the last two segments combined.
- P5 asymmetrical, uniramous, 4-segmented. Distal segment elongated and curved on the right leg. Segment 2 of the left leg with inner enlargement. Distal segment usually presented as triangular with a hook. SEM observation showed a concave triangular pallet stoched with bundles of fine setae and with a thorny bludgeon process.


Species Eurytemora pacifica - Plate 15 of morphological figuresIssued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179, [p.86, Fig. 44]. Eurytemora pacifica female (from the Japan Sea).


Species Eurytemora pacifica - Plate 16 of morphological figuresIssued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179, [p.87, Fig. 45]. Eurytemora pacifica female (from the Japan Sea).
Gs = genital segment (ventral view).


Species Eurytemora pacifica - Plate 17 of morphological figuresIssued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179, [p.87, Fig. 45]. Eurytemora pacifica Male (from the Japan Sea).


Species Eurytemora pacifica - Plate 18 of morphological figuresIssued from : S.I. Dodson, D.A. Skelly & C.E. Lee in Hydrobiologia, 2010, 653. [p.141, Table 2]. Descriptions of North American species of Eurytemora from Alaska.

Compl. Ref.:
Kos, 1985 (p.228); Yoo, 1991 (tab.1); Myung & al., 1994 (tab.1); Shih & Young, 1995 (p.74); Madhupratap & al., 1996 (p.77, Table 2: resting eggs); Mauchline, 1998 (tab.40); Pinchuk & Paul, 2000 (p.4, table 1, % occurrence); Uye & al., 2000 (p.193, fig.7 : abundance vs t°, Sal.); Ueda & al., 2000 (tab.1); Ohtsuka & al., 2008 (p.115, Table 5); Hopcroft & al., 2009 (p.9, Table 3); Hopcroft & al., 2010 (p.27, Table 2, fig.9); DiBacco & al., 2012 (p.483, Table S1, ballast water transport); Lee D.B. & al., 2012 (p.88, co-occurrence); Moon & al., 2012 (p.1, Table 1, 2, figs.10, 11, seasonal & spatial variations); Questel & al., 2013 (p.23, Table 3, interannual abundance & biomass, 2008-2010); Eisner & al., 2013 (p.87, Table 3: abundance vs water structure); Coyle & al., 2014 (p.97, table 10); Ohtsuka & Nishida, 2017 (p.565, 578, Table 22.1).
Loc:
China Seas (Yellow Sea), W & S Korea, Muan Bay Asan Bay, Japan (Akkeshi Bay, Kochi, Honshu: Onagawa Bay, Lake Nakaumi), Japan Sea, S Kuril Is., N Okhotsk Sea, E Siberia, Chukchi Sea, E Sakhalin (neritic), Bering Sea, Karagin Bay, Alaska, Strait of Georgia, Arct, Arcachon Bay, Marennes-Oléron Bay, Concarneau (in the Marinarium)
N: 32
Lg.:
(22) F: 1,28-1,12; M: 1,12-1,03; (190) F: 1,28; M: 1,12; (290) F: 1,1-1,26; M: 0,92-1,08; (568) F: 0,99-1,46; M: 0,99-1,16; (571) F: 1,19-0,99; 1,29-1,05; M: 1,16-0,99; (1201) F: 1,07-1,27; M: 0,9-0,97; (1220) F: 0,99-1,85; M: 0,92-2,0; (1232) F: 0,99-1,33; M: 0,99-1,16; (1 {F: 0,99-1,85; M: 0,90-2,0}
Rem.: Brackish, marine (littoral).
Incomplete data.
After Heron (1964, p.209) specimens of adult females varied considerably in the development of metasomal wings. Specimens without wings appeared with left metasomal lobe slightly larger.
After Heron & Damkaer (1976, Table 2) ratio anal somite/uropod (= caudal rami) 8/9; with female metasomal wings, not in male.
For Brylinski & al. (2006) the introduction of this species to atlantic french coast is attributed to the importation of oysters Crassostrea gigas (Thunberg, 1793) which replaced Crassostrea angulata (Lamarck, 1819) (viral disease) in the late 1960's. From 1971 to 1977 the quantities of non-native oysters imported to Oléron Bay alone consisted of 256 t of adults from British Columbia and 4,574 t as spat on spat collectors from Japan (Grizel & Héral, 1991). The first record of Eurytemora pacifica in the Arcachon Bay (France) in Piraillan's pond was confirmed by V. David (> 98% of 3000 copepods in March 2014, not published). This observation points outthe capacity of the species to colonize areas independently of oyster farming all along the whole French Atlantic coast.
Ohrsuka & Nishida (2017, p.578) consider this species as a cold-water species on the japanese coasts infuenced by Oyashio waters.
Last update : 06/06/2020
    to add or edit your remark
  
By Jean-Michel Brylinski 2017-01-17 17:20:02    ( Citation of this remark )
The cyclomorphosis in the Eurytemora pacifica life cycle should be an exceptional case for the copepods (Brylinski et al 2016).

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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 October 18, 2021]

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