Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Euchaetidae ( Famille )
            Paraeuchaeta ( Genre )
Paraeuchaeta scotti  (Farran, 1908)   (F,M)
Syn.: Euchaeta scotti Farran, 1908 b (p.42, Descr.F, figs.F); Lysholm & Nordgaard, 1921 (p.18); Vervoort, 1957 (p.77); Grice & Hulsemann, 1967 (p.16); 1968 (tab.2); Harding, 1974 (p.141, tab.2, gut contents); Park, 1975 c (p.19, figs.F,M, Rem.); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Park, 1978 (p.278, figs.F, Rem.); Ward & Wood, 1988 (p.45, tab.1); Park, 1994 (p.322); Mauchline, 1992 a (p.2, 3); 1994 a (p.561); 1999 (n°182, p.8, figs.F,M);
Pareuchaeta scotti : Hardy & Gunther, 1935 (1936) (p.161, Rem.); C.B. Wilson, 1950 (p.284);
? Pareuchaeta scotti : Jespersen, 1934 (p.81, Rem.); 1940 (p.31); Tanaka, 1958 (p.353, figs.F,M); Tanaka & Omori, 1968 (p.253, figs.F); Heptner, 1971 (p.87, figs.M); Mauchline, 1998 (tab.42); Holmes, 2001 (p.53);
Euchaete scotti : With, 1915 (p.179, figs.F,M, juv.);
no E. scotti : Wolfenden, 1911 (p.301, figs.);
no Pareuchaeta scotti : Sars, 1925 (p.116, figs.F,M); Rose, 1933 a (p.121, figs.F,M); Lysholm & al., 1945 (p.23); ? Sewell, 1947 (p.125, Rem.)
Björnberg & al., 1981 (p.633, 635, figs.F,M); Bradford & al.,1983 (p.23); Park, 1994 (p.322, 326, biogeo); 1995 (p.40, Rem.F,M, figs.F,M); Bradford-Grieve & al., 1999 (p.880, 926, figs.F,M)
Espèce Paraeuchaeta scotti - Planche 1 de figures morphologiquesissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.137, Fig.27].
Female: a, forehead (left side); b, urosome (left); c, genital somite (left); d, outer lobe of Mx1; e, exopod of P1 (anterior); f, exopod of P2 (anterior).
Nota: Similar in habitus to P. eltaminae but distinguishable from it: Rostrum in lateral view more elongated with narrower base.
Dorsal margin of genital somite with a conspicuous hump anterior to middle. Posterior edge of genital field produced distally into a relatively large lobe. Posterior margin of genital prominence nearly straight, sloping about 35° with respect to long body axis and about as long as posterior ventral wall of genital somite.
Cephalosomal appendages and swimming legs similar to those of P. eltaminae with minor exceptions: In Mx1 outer lobe, 2nd seta from proximal end small.
Outer spine of 2nd exopodal segment of P1 scarcely reaching base of following outer spine.
In P2 exopod, outer spines of 3rd segment better developed

Male: g, forehead (left); h, P1 (anterior); i, P2 (anterior); j, distal exopodal segments of left 5th leg (tilted counterclockwise); k, idem (lateral); l, idem (medial).

Espèce Paraeuchaeta scotti - Planche 2 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.279, Fig.117]. As Euchaeta scotti.
Female: A, forehead (lateral); B, C, D, E, distal end of metasome and genital segment (left side, right side, dorsal, and ventral, respectively); F, outer lobe of Mx1; G, P1; H, P2. P1-2: legs (anterior).

Espèce Paraeuchaeta scotti - Planche 3 de figures morphologiquesissued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1958, VI (3). [p.114, Fig.74]. As Pareuchaeta scotti.
Female: a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and part of the urosome (lateral left side); d, genital complex (ventral); e, outer lobe of Mx1; f, f, exopod of P1; g, exopod of P2.
Nota: The urosome segments and furca are in the proportional lengths as 48:18:19:7:8: = 100. A1 reaches the middle of the 3rd thoracic segment.

Male: h, exopod of P1; i, terminal segments of left P5; j, tooth-plate of the same segment.

Espèce Paraeuchaeta scotti - Planche 4 de figures morphologiquesissued from : M.V. Heptner in Trudy. Inst. Okeanol., 1971, 92. [p.88, Fig.6]. As Pareuchaeta scotti.
Male (from Kuril-Kamchatka Trench). r, rostrum (lateral); ld, portion of left exopod of P5.
Nota: Formula of the exopod of P1 spines on the last two segments, successively: Aa = 0; Bb = BC (Bb = 1/2 BC). P2: Bb < BC (Bb ≈ 1/2 BC; Cc < CD (Cc ≈ 1/3 CD. [cf. legend in drawings of Heptner, 1971, for Pareuchaeta rubra]

Espèce Paraeuchaeta scotti - Planche 5 de figures morphologiquesissued from : G.P. Farran in Fish. Ire. Sci. Invest., 1906, II [1908]. [Pl. III, Figs.11-12]. As Euchaeta Scotti.
Female (from W Ireland): 11, genital segment (lateral); 12, exopod of P2.

Espèce Paraeuchaeta scotti - Planche 6 de figures morphologiquesissued from : J. Mauchline in ICES Ident. Leafl. Plankton, 1999, N°182. [p.3, Fig.2: 13a]. As Euchaeta scotti.
Female (Northeast Atlantic): 13a, genital double-somite (left side).

Espèce Paraeuchaeta scotti - Planche 7 de figures morphologiquesissued from : J. Mauchline in ICES Ident. Leafl. Plankton, 1999, N°182. [p.4, Fig.3: 13b]. As Euchaeta scotti.
Male (Northeast Atlantic): 11b, terminal two segments, exopodal segments of left P5.

Espèce Paraeuchaeta scotti - Planche 8 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [p.179, Text-fig. 51, a-d]. As Euchaete Scotti.
Female (from 61°30'N, 17°08'W): a-d, corner of last thoracic segment and genital segment (lateral and dorsal views).

Espèce Paraeuchaeta scotti - Planche 9 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [p.179, Text-fig. 51, e]. As Euchaete Scotti.
Female: e, genital area (ventral view).

Espèce Paraeuchaeta scotti - Planche 10 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VI, Fig.10, a-b]. As Euchaete Scotti.
Female: a, labrum (oral view); b, lamina labialis and serrula 6-dentata.

Espèce Paraeuchaeta scotti - Planche 11 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [p.179, Text-fig. 51, f]. As Euchaete Scotti.
Male: corner of last thoracic segment and genital segment (left side).

Espèce Paraeuchaeta scotti - Planche 12 de figures morphologiquesissued from : C. With in The Danish Ingolf-Expedition, Copepoda I, 1915, III, 4. [Pl. VI, Fig.10, c]. As Euchaete Scotti.
Male: c, left P5 (2nd and 3rd exopodal segment).

Espèce Paraeuchaeta scotti - Planche 13 de figures morphologiquesissued from : T. Park in Smiths. Contr. Zool., 1975, 196. [p.21, Fig.18]. As Euchaeta scotti.
Female (G. of Mexico): a, forehead (lateral); b, genital segment (right side).
pr = posterior ridge of genital field.
Nota: The female is characteristic in having a humped dorsal wall of the genital segment and a straightly sloping posterior side of the genital prominence.

Male: c, forehead (lateral); d, exopod of left P5 (anterior); e, same (lateral); f, same (medial).

Nota: These findings constiute the first record of the species from the Gulf of Mexico and Caribbean Sea, in tows down to depths of more than 1000 m.

Espèce Paraeuchaeta scotti - Planche 14 de figures morphologiquesParaeuchaeta scotti Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30): malayensis species Group.
2 - Outer spine of 2nd exopodal segment (or the 2nd of the first 2 exopodal segments forming a proximal, compound segment) of P1 normally developed (Fig.27-e).
3 - Outer lobe of Mx1 with 6 long setae in addition to 1 or 2 short, unequal size setae proximally (Fig.27-d).
4 - Genital somite without a conical process on left side close to anterior base of genital prominence (Fig.27-c).
5 - Dorsally and ventrally, genital somite symmetrical.
6 - Laterally, genital flange with normal posterior lobe (Fig.27-c).
7 - Laterally, genital somite with more or less smooth dorsal margin (Fig.27-c).
8 - Laterally, genital prominence with nearly straight or only slightly bulging posterior margin (Fig.27-c).
9 - Outer lobe of Mx1 with 6 long setae plus 1 or 2 very small setae (Fig.27-d).
10 - In 3rd exopodal segment of P2, 2nd marginal lobe separated from segment by shallow cleft and has relatively small outer spine (Fig.27-f).

Ref. compl.:
Grice, 1963 a (p.495); De Decker & Mombeck, 1964 (p.13); Suarez-Morales & Gasca, 1998 a (p.109); Razouls & al., 2000 (p.343, Appendix); Park & Ferrari, 2009 (p.143, Table 5, fig.1, Appendix 1, biogeography); Hidalgo & al., 2010 (p.2089, Table 2)
NZ: 13 + 3 douteuses

Carte de distribution de Paraeuchaeta scotti par zones géographiques
Espèce Paraeuchaeta scotti - Carte de distribution 3issued from : T. Park in Hydrobiologia 292/293, 1994. [Fig. 2, p.326]. Geographical distribution of Paraeuchaeta scotti (triangle).
Antarct. (SW Atlant., SE Pacif.), South Georgia, sub-Antarct. (SW Atlant., Indian, SE Pacif., South Africa (E), SW Atlant., Caribbean Sea, G. of Mexico, off Bermuda: Station "S" (32°10'N, 64°30'W), off E & SE Cape Cod, off Azores, off W Ireland, off Rockall Is., ? W Greenland, S Iceland, ? Norwegian Sea, ? Arabian Sea, Mozambique Channel, S Indian, Indonesia-Malaysia, S Australia, Peru, off Is. Juan Fernandez, Chile (N-S), Japan (Sagami), ? Kuril-Kamtchatka
N: 26
(3) F: 4-4,7; M: 3,8-4,2; (7) F: 5,99; M: 5,56; (19) F: 6,16-5,91; M: 5,58-5,33; (24) F: 6,3-5,7; (99) F: 5,0; M: 4,75; {F: 4,00-6,30; M: 3,80-5,58}

The mean female size is 5.470 mm (n = 8; SD = 0.8156), and the mean male size is 4.870 mm (n = 6; SD = 0.7483). The size ratio (male : female) is 0.926 (n = 4; SD = 0.0191), or ± 92 %.
Rem.: Bathypélagique.
Sampling depth (Antarct., sub-Antarct.) : 0-600-4000 m. 2000-1000 m (Harding, 1974).
Park (1978, p.278) émet quelques doutes sur les signalisations géographiques de cette espèce du fait des confusions possibles avec Paraeuchaeta aequatorialis , P. rasa et P. eltaninae .
Voir aussi les remarques en anglais
Dernière mise à jour : 07/12/2020

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2024. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur [Accédé le 20 juillet 2024]

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