Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Euchaetidae ( Famille )
            Paraeuchaeta ( Genre )
Paraeuchaeta exigua  (Wolfenden, 1911)   (F,M)
Syn.: Euchaeta exigua Wolfenden, 1911 (p.300, Descr.F, figs.F); Vervoort, 1957 (p.82, Rem.); Grice & Hulsemann, 1967 (p.15); Bradford, 1972 (p.40, figs.F, Rem.); Park, 1978 (p.235, figs.F,M, Rem.); Pareuchaeta exigua : C.B. Wilson, 1950 (p.280, figs.F)
Ref.:
Bradford & al., 1983 (p.39, figs.F,M, Rem.); Razouls, 1994 (p.93, figs.F, M); Park, 1994 (p.321); 1995 (p.77, Rem.F,M, figs.F,M); Bradford-Grieve & al., 1999 (p.880, 926, figs.F,M)
Espèce Paraeuchaeta exigua - Planche 1 de figures morphologiquesFemale: 1, habitus (lateral); issued from : Bradford, Haakonssen and Jillett in Mem. N.Z. oceanogr. Inst., 1983, 90: 1-150. 2, Head (lateral); 3, Urosome (dorsal); 4, 4', genital segment (ventral, lateral); issued from : Park T.-S. in Antarct. Res. Ser. Washington, 1978, 27: 91-290.
Male: 5, habitus (lateral); issued from : Bradford & al., 1983. 6, Head (lateral); 7, 7', Th5 (lateral); 8, P5 (G: left, Dt: right); 9, 9a, distal exopodite of P5; issued from : Park, 1978; 9b,c,d, distal exopodite of P5; issued from : Bradford & al., 1983.


Espèce Paraeuchaeta exigua - Planche 2 de figures morphologiquesissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.184, Fig.74].
Female: a, forehead (left side); b, urosome (left); c, genital somite (left); d, Mx1 (first inner lobe omitted), posterior; e, exopod of P1 (anterior); f, exopod of P2 (anterior).
Nota: Cephalosomal appendages as in P. norvegica except that basis of Mx1 with 4 setae, small outermost seta being absent as in P. tonsa. Outer spine of 1st exopodal segment of P1 very small. 2nd outer spine of 3rd exopodal segment of P2 reaching close to base of following outer spine, and about as long as outer spine of 2nd exopodal segment; incision separating 2nd marginal lobe of 3rd exopodal segment relatively deep, reaching about 3/5 way from distal to proximal end of segment, while in P. norvegica, it reaches about halfway from distal to proximal end of segment.
Male: g, forehead (left); h, exopod of P2 (anterior); i, exopod of left 5th leg (medial); j, distal endof left 5th leg exopod (anterior, tilted counterclockwise); k, serrated lamella and digitiform process of left 5th leg exopod (anterior, tilted clockwise).


Espèce Paraeuchaeta exigua - Planche 3 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.236, Fig. 88]; As Euchaeta exigua.
Female: A, forehead (lateral); B, C, D, distal end of metasome and genital segment (left side, right side, and ventral, respectively); E, posterior part of metasome and urosome (dorsal); F, outer lobe of Mx1; G, P1; H, P2. P1-2: legs (anterior).


Espèce Paraeuchaeta exigua - Planche 4 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.237, Fig. 89]; As Euchaeta exigua.
Male: A, forehead (lateral); B, C, last metasomal and genital segments (left side and right side, respectively); D, P1; E, P2; F, P5; G, H, I, distal part of exopod of left P5 (anterior, lateral, and medial, respectively). P1-5: legs (anterior).


Espèce Paraeuchaeta exigua - Planche 5 de figures morphologiquesissued from : J.M. Bradford, L. Haakonssen & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 1983, 90. [p.40, Fig.19].
Female: A, habitus (lateral right side); B, genital segment (dorsal); C, idem (lateral right side); D, genital field (ventral); E, exopod of P1; F, exopod segment 3 of P2.
Nota: - P1 exopod female: Aa = 1/3 AB; Bb = 4/5 BC; Cc ± BC.
- P2 exopod female: Aa ≥ AB; Bb = 1/2 BC; Cc = 5/6 CD; Dd = 1/4 CD. (see code of lengths outer spines in the Genus' figure, or in Paraeuchaeta sp. A).

Male: G, habitus (lateral right side); H, exopod of P1; I, exopod segment 3 of P2; J, P5; K, medial view of terminal part of left P5 exopod; L, terminal part of left P5 exopod. Nota: The present males vary in the length of the left P5 exopod segment 3 relative to the serrated lamella, which may be slightly longer or shorter.
P1 exopod male: Aa minute; Bb = 1/3 BC; Cc = 1/2 BC.- P2 exopod male: Aa = 1/3 AB; Bb = 1/2 BC; Cc > 1/3 CD; Dd = 1/4 CD. (see code of lengths outer spines in the Genus' figure, or in Paraeuchaeta sp. A).


Espèce Paraeuchaeta exigua - Planche 6 de figures morphologiquesissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [p.300, Fig.52]. As Euchaeta exigua.
Female: a, posterior part cephalothorax and genital segment; b, genital segment (ventral); c, outer margin of exopod of P1; d, outer margin of exopod of P2.


Espèce Paraeuchaeta exigua - Planche 7 de figures morphologiquesissued from : J.M. Bradford in Mem. N. Z. Oceonogr. Inst., 1972, 54. [p.41, Fig.8, (14-16)]. As Euchaeta exigua.
Female (from Kaikoura, New Zealand): 14, habitus (dorssal); 15, exopod segment 3 of P2; 16, genital segment (lateral, left side).
Scale bars: 1 mm (14, 15, 16).

Nota: This specimen agrees with the description of Wolfenden, except that its abdomen is very hairy.


Espèce Paraeuchaeta exigua - Planche 8 de figures morphologiquesParaeuchaeta exigua Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30).
2 - Laterally, genital field facing ventrad, with large tubercular outgrowth behind genital orifice (Fig.74-c).
3 - Genital somite without transverse ridge on ventral side anterior to genital prominence (Fig.74-c).
4 - Laterally, genital flange low and inconspicuous (Fig.74-c).
5 - Laterally, genital prominence relatively low (Fig.74-c)


Espèce Paraeuchaeta exigua - Planche 9 de figures morphologiquesIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.93]. Caractéristiques morphologiques de Paraeuchaeta exigua femelle et mâle adultes.
Terminologie et abbréviations: voir à Calanus propinquus.

Nota: La femelle ressemble à celle de P. pseudotonsa (Fontaine, 1967).

Ref. compl.:
Sewell, 1948 (p.523); De Decker & Mombeck, 1964 (p.13); Errhif & al., 1997 (p.422); Razouls & al., 2000 (p.343, Appendix); Park & Ferrari, 2009 (p.143, Table 5, Appendix 1, biogeography); Takahashi & al., 2010 (p.1, Table 4); Takahashi & al., 2011 (p.134, distribution);
NZ: 6

Carte de distribution de Paraeuchaeta exigua par zones géographiques
Espèce Paraeuchaeta exigua - Carte de distribution 3issued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.68]. As Euchaeta exigua.
Chart showing the geographical distribution (white triangle) in the seas surrounding the Antarctic continent.
Nota: In this chart the area frequented by whaling vessels has been hatched. The Antarctic circle (66°.5 S) has been drawn as a broken line. The numbers I to VI refer to the sectors into which the Antarctic seas are divided according to Mackintosh (1942) (after Vervoort, 1951).
Loc:
Antarct. (Weddell Sea, Indian), sub-Antarct. (Indian), South Africa (E), off E Tristan da Cunha, W Indien, S Indian (subtropical convergence), S New Caledonia, S Australia, S Tasmania, Tasman Sea, New Zealand (Kaikoura), NE Easter Is. (in C.B. Wilson, 1950)
N: 12
Lg.:
(3) F: 7,3-6,4; M: 6-5,3; (9) F: 7,6-6,1; M: 5,4-4,7; (10) F: 6,7; (20) F: 7,66-6,35; M: 5,83-5,08; (25) F: 6,75; (116) F: 6,95; {F: 6,10-7,66; M: 5,08-6,00}
Rem.: méso-bathypélagique.
Sampling depth (Antarct., sub-Antarct.) : 0-3000 m.
Voir aussi les remarques en anglais
Dernière mise à jour : 27/01/2017

 Toute utilisation de ce site pour une publication sera mentionnée avec la référence suivante :

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 27 septembre 2020]

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