Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Euchaetidae ( Family )
            Euchaeta ( Genus )
Euchaeta tenuis  Esterly, 1906   (F,M)
Syn.: E. solida Esterly, 1911 (p.324, figs.M)); Sewell, 1948 (p.556, 563);
Pareuchaeta solida : Brodsky, 1950 (1967) (p.221, figs.M); ? Tanaka & Omori, 1968 (p.255, figs.M);
Paraeuchaeta tenuis : Bradford & al., 1983 (p.23);
Pareuchaeta tenuis : Heinrich, 1990 (p.17)
Ref.:
Esterly, 1906 a (p.61, Descr.F, figs.F); A. Scott, 1909 (p.68, figs.F); Sewell, 1929 (p.133, 149, figs.F,M, juv., Rem.); 1947 (p.117); Brodsky, 1950 (1967) (p.202, figs.F, Rem.); Vervoort, 1957 (p.78); Grice, 1962 (p.201, figs.F,M); Tanaka, 1973 (p.138, figs.F,M); Chen & Shen, 1974 (p.129, figs.F); Park, 1995 (p.25, Redescr.F,M, figs.F,M)
Species Euchaeta tenuis - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.125, Fig.15].
Female (from the eastern Pacific): a, forehead (left side); b, urosome (left); c, d, e, genital somite (left, right, ventral, respectively); f, Mx1 (first inner lobe omitted); g, P1 (anterior); h, P2 (anterior).
Female (from the central equatorial Pacific): i, genital somite (left);
Female (from the East China Sea): j, genital somite (left).


Species Euchaeta tenuis - Plate 2 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.126, Fig.16].
Male (from off the west coast of South America): a, forehead (left side); b, P1(anterior); c, P2 (anterior); d, exopod of left 5th leg (anterior); e, idem (anterior, tilted clockwise); f, idem (medial, tilted clockwise)


Species Euchaeta tenuis - Plate 3 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.150, Fig.58].
Bemale (from off SE Sri-Lanka): a, habitus (dorsal); b, forehead (lateral); c, urosome (lateral left side); d, Mx2; e, P1; f, P2 (exopodal segments 2 and 3).

Male: g, P5; h, left P5.


Species Euchaeta tenuis - Plate 4 of morphological figuresissued from : Q.-c Chen & C.-j. Shen in Studia Marina Sinica, 1974, 9. [p.129, Figs.20-22].
Female: 20, habitus (dorsal); 21, forehead (lateral); 22, P2.


Species Euchaeta tenuis - Plate 5 of morphological figuresissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XIX, Figs.1-8].
Female (from Indonesia-Malaysia): 1, habitus (dorsal); 2, forehead (lateral); 3, last thoracic and genital segments (left side); 4, A1; 5, Mxp (one of the distal hairs); 6, P1; 7, P2; 8, part of terminal spine of exopodite of P3.


Species Euchaeta tenuis - Plate 6 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.26, Fig.2]. As Euchaeta solida.
Male (from San Diego Region): 2, habitus (lateral).


Species Euchaeta tenuis - Plate 7 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.28, Fig.34]. As Euchaeta solida.
Male: 34, forehead (lateral).


Species Euchaeta tenuis - Plate 8 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1911, 6 (14). [Pl.30, Fig.78]. As Euchaeta solida.
Male: 78, toothed process on the 2nd segment ot the exopod of the left P5.


Species Euchaeta tenuis - Plate 9 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.9, Fig.12].
Female (from San Diego, California): 12, forehead (lateral).


Species Euchaeta tenuis - Plate 10 of morphological figuresissued from : C.O. Esterly in Univ. Calif. Publs Zool., 1906, 3 (5). [Pl.10, Figs.29, 31].
Female: 29, last thoracic segment and genital segment (lateral), 31, genital segment (ventral).


Species Euchaeta tenuis - Plate 11 of morphological figuresissued from : G.D. Grice in Fish. Bull. Fish and Wildl. Ser., 1962, 61. [p.200, Pl.13, Figs.15-20].
Female (from equatorial Pacific): 15, habitus (lateral); 16, posterior part of thorax and urosome (lateral, left side); 17, same (right side); 18, P2.
Nota: Large and asymmetrical ventral protrusions genital segment.

Male: 19, P5; 20, terminal part of left P5.


Species Euchaeta tenuis - Plate 12 of morphological figuresissued from : O. Tanaka in I O B C Handbook, 1973, IV. [p.139, Fig.7, A-C].
Female (from Bay of Bengal): A, forehead (lateral); B, genital segment (dorsal); C, last thoracic segment and genital segment (lateral, left side).


Species Euchaeta tenuis - Plate 13 of morphological figuresissued from : O. Tanaka in I O B C Handbook, 1973, IV. [p.139, Fig.8, D-E].
Male: D, forehead (lateral); E, distal segment of left P5.


Species Euchaeta tenuis - Plate 14 of morphological figuresissued from : O. Tanaka in I O B C Handbook, 1973, IV. [p.138, Fig.9: 8].
Female: 8, 2nd outer marginal spine of exopod 3 of P2.

Nota: This spine is long, reaching to midway between the base of the spine and that of the distal spine.

Compl. Ref.:
Sewell, 1948 (p.329, 348, 530, 531, 534, 539, 540, 541, 542, 552, 556, 562); Fleminger, 1967 a (tabl.1); Patel, 1975 (p.659); Tranter, 1977 (p.596); Sreekumaran Nair & al., 1981 (p.493), Guangshan & Honglin, 1984 (p.118, tab.); Longhurst, 1985 (tab.2); Madhupratap & Haridas, 1986 (p.105, tab.1); Sarkar & al., 1986 (p.178); Hattori, 1991 (tab.1, Appendix); Shih & Young, 1995 (p.70); Prusova & Smith, 2005 (p.77); Morales-Ramirez & Suarez-Morales, 2008 (p.520)
NZ: 8

Distribution map of Euchaeta tenuis by geographical zones
Loc:
G. d’Aden, Arabian Sea, Is. Maldives, Indian, off Ceylan E, India (E, Saurashtra coast, Hooghly estuary, G. du Bengale, Australie W, Indonésie-Malaisie, mers de Chine (East China Sea, South China Sea), off Japan, off Sanriku, Californie, off Guatemala W, W Costa Rica, Pacif. W (équatorial), Pacif. équatorial, Pacif. E (tropical N-S), Chili N
N: 24
Lg.:
(3) F: 6,1-5,3; M: 5,1-4,68; (5) F: 6,8; (17) F: 6; (22) F: 6,8-6; M: 5,22; (29) F: 4,9; (98) F: 6,28-4,7; M: 5,63-5,35; (101) F: 5,98-5,13; M: 4,75-5,22; {F: 4,70-6,80; M: 4,68-5,63}
Rem.: mesopelagic.
For Park (1995, p.22) this species belongs to ‘’acuta ’’ Group.
Last update : 27/02/2013
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[Accessed May 26, 2013]

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