Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Oithona ( Genus )
Oithona attenuata  Farran, 1913   (F,M)
Syn.: Oithona attenuata var. latithoracica Früchtl, 1923 (p.454); 1924 b (p.71, fig., Rem.);
Oithona ovata Lindberg, 1950 (p.261); Lindberg, 1955 a (p.467: Rem.); Shuvalov, 1980 (p.149, figs.F)
Ref.:
Farran, 1913 a (p.187, figs.F); Rosendorn, 1917 (p.303); 1917 a (p.42, figs.F,M); Früchtl, 1924 b (p.70, 72, fig., Rem.); Kiefer, 1929 g (p.8, Rem.F,M); Farran, 1936 a (p.124); Sewell, 1947 (p.253); Tanaka, 1960 (p.56, figs.F); Wellershaus, 1970 (p.480); Chen & al., 1974 (p.34, figs.F, p.74: Rem.); Nishida & al., 1977 (p.128, figs.F, Rem.); Shuvalov, 1980 (p.154, figs.F); Nishida, 1985 a (p.21, figs.F,M, Rem., p.138); Böttger-Schnack, 1988 (p.313, Rem.); Kim & al., 1993 (p.271); Chihara & Murano, 1997 (p.936, Pl.198, 203: F,M); Bradford-Grieve & al., 1999 (p.886, 966, figs.F); McKinnon, 2000 (p.108, Rem.); Al-Yamani & Prusova, 2003 (p.100, figs.F,M); Conway & al., 2003 (p.203, figs.F,M, Rem.); Vives & Shmeleva, 2010 (p.48,50, 83, figs.F,M, Rem.); Al-Yamani & al., 2011 (p.96, figs.F,M)
Species Oithona attenuata - Plate 1 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.22, Fig.5]. As Oithona attenuata typical form.
Female: a, habitus (dorsal); b, forehead (lateral); c, A2; d, Md; e, Mx1; f, Mx2; g, Mxp.
Nota: The typical form coincides with the descriptions of Farran (1913) and Früchtl (1924) and Nishida & al. (1977).


Species Oithona attenuata - Plate 2 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.23, Fig.6]. As Oithona attenuata typical form.
Female:a, last thoracic segment 5 and gental segment (lateral left side); b, Anal segment and caudal rami (dorsal); c, A1; d, Md (biting edge); e, P1; f, P2; g, P3; h, P4.; W = width, L = length, Csi = distance between distal margin of caudal ramus and base of outer marginal seta measured parallel to the longitudinal axis of caudal ramus.


Species Oithona attenuata - Plate 3 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.25, Fig.7]. As Oithona attenuata stocky form.
Female: a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment 5 and genital segment (dorsal); d, idem (lateral left side); e, anal segment and caudal rami (ventral); f, A1; g, Md; h, Mx1.
Nota: This form is referable to O. attenuata var. lathithoracica Früchtl (1923; 1924) and O. ovata Lindberg (1950).


Species Oithona attenuata - Plate 4 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.26, Fig.8]. As Oithona attenuata stocky form.
Female: a, caudal rami (dorsal); b, A2; c, Mx2; d, Mxp; e, P1; f, P2; g, P4.


Species Oithona attenuata - Plate 5 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.27, Fig.9]. As Oithona attenuata stocky form.
Male: a, habitus (dorsal); b, forehead (lateral); c, genital segment (ventral); d, idem (dorsal); e, anal segment and caudal rami (dorsal); f, A1; g, Md; h, Mx1.


Species Oithona attenuata - Plate 6 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.28, Fig.10]. As Oithona attenuata stocky form.
Male: a, genital segment (lateral left side); b, A2; c, Mx2; d, Mxp; e, P1; f, P2; g, P4.


Species Oithona attenuata - Plate 7 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.29, Table 2.].
Variation of length and body proportions of female Oithona attenuata reported by previous workers and calculated by Nishida.
For Nishida the typical form has longer body, greater length to width ratio in prosome, and smaller prosome to urosome length ratio than the stocky form (See Table 2).


Species Oithona attenuata - Plate 8 of morphological figuresissued from : Q.-c Chen & S.-z. Zhang & C.-s. Zhu in Studia Marina Sinica, 1974, 9. [Pl.2, Figs.13-15].
Female (from China Seas): 13, habitus (dorsal); 14, forehead (lateral); 15, P1.


Species Oithona attenuata - Plate 9 of morphological figuresissued from : Q.-c Chen & S.-z. Zhang & C.-s. Zhu in Studia Marina Sinica, 1974, 9. [Pl.3, Figs.1-3].
Female: 1, P2; 2, P3; 3, P4.


Species Oithona attenuata - Plate 10 of morphological figuresissued from : F.Y. Al-Yamani & I. Prusova in Common Copepods Northwestern Arabian Gulf : Identification Guide. Kuwait Institute for Scientific Research, 2003. [p.101, Fig.36].
Female: A, habitus (dorsal); B, idem (lateral left side); C, urosmal segments 1 and 2 (dorsal); D, A2; E, exopod of P1; F, exopod of P2; H, exopod of P3; I, Md (mandibular palp).
Nota: Prosome 1.5 times width, 1.0 times urosome.
Present specimens agree with Nishida's (1985) description of O. attenuata stocky form.


Species Oithona attenuata - Plate 11 of morphological figuresissued from : F.Y. Al-Yamani & I. Prusova in Common Copepods Northwestern Arabian Gulf : Identification Guide. Kuwait Institute for Scientific Research, 2003. [p.102, Fig.37].
Male: J, habitus (dorsal); K, urosomal segments 1-3 (ventral); L, A2; M, Md (mandibular palp).
Nota: Prosome length 1.9 times width, 1.2 tmes urosome. P6 with 2 subequal short setae, extending to posterior end of urosomal segment 3.


Species Oithona attenuata - Plate 12 of morphological figuresissued from : G.P. Farran in Proc. zool. Soc. Lond., 1913. [Plate XXX, Figs.3-7].
Female (from Christmas Island, Indian): 3, forehead (lateral); 4, A1: 5, habitus (dorsal); 6, P3; 7, P1.


Species Oithona attenuata - Plate 13 of morphological figuresissued from : I. Rosendorn in Wiss. Ergebn. dt. Tiefsee-Exped. \"Valdiviella\", 1917, 23. [p.43, Fig.25].
Female: a, Md.
Nota: Proportion of lengths (p.cent) Prosome : 47.26, Urosome : 52.74 . Relative lengths of urosomal segments and caudal rami: 5 : 18 : 8 : 9 : 6 : 8. Setal formula of the exopod swimming legs P1 to P4 (Se = outer setae), P1 : 1, 1, 3 Se ; P2 : 1, 1, 3 Se; P3 : 1, 1, 3 Se ; P4 : 1, 1, 2 Se.

Male: b, habitus (dorsal); c, exopod of P1; d, exopod of P2; e, urosome; f, exopod of P3; h, Md.
Nota: Proportion of lengths (p.cent) Prosome : 50.94, Urosome : 49.06 . Relative lengths of urosomal segments and caudal rami: 6 : 11 : 9 : 8 : 6.5 : 7.5 : 9. Setal formula of the exopod swimming legs P1 to P4 (Se = outer setae), P1 : 1, 1, 3 Se; P2 : 1, 1, 3 Se ; P3 : 1, 1, 3 Se ; P4 : 1, 1, 2 Se.


Species Oithona attenuata - Plate 14 of morphological figuresissued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.150, Fig.42]. As Oithona ovata. After Lindberg, 1950.
Female: A, habitus (dorsal); B, forehead (ventral); C, end of prosome and urosome (dorsal); D, genital segment; E, anal segment and caudal rami; F, same.


Species Oithona attenuata - Plate 15 of morphological figuresissued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.151, Fig.43]. As Oithona ovata. After Lindberg, 1950.
Female: A, A1; B, A2; C, Md; D, P1; E, P4.


Species Oithona attenuata - Plate 16 of morphological figuresissued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.131, Fig.32, 1-8].
Female: 1, 3, habitus (dorsal and lateral, respectively); 2, A1; 4-5, forehead (lateral and dorsal); 6-7, thoracic segments 4 and 5, genital segment (dorsal and lateral, respectively); 8, posterior part of urosome (dorsal).


Species Oithona attenuata - Plate 17 of morphological figuresIssued from : S. Nishida, O. Tanaka & M. Omori in Bull. Plankton Soc. Japan, 1977, 24 (2). [p.129, Fig.3].
Female (from Suruga Bay and adjacent waters): a, habitus (dorsal), b, forehead (lateral); c, Md; d, P1; e, P2.

Nota: Setae formula of exopod P1 to P4 (outer setae in first, inner setae in second). P1: 1,1,3; 1,1,4. P2: 1,1,3; 1,1,5. P3: 1,1,3; 1,1,5. P4: 1,1,2; 1,1,5.
Prosome length/urosome length = 0.82-0.87.


Species Oithona attenuata - Plate 18 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. XXIV, 7-12].
Female (from 0°08'S, 76°15'E): 7, forehead (dorsal); 8, urosome (dorsal); 9, P1; 10, endopod of P2; 11, P3; 12, exopod of P4.

Nota: Prosome and urosome in the proportional lengths 52 to 48.
Rostrum absent.
Urosomal segments and caudal rami in the proportional lengths 12 : 29 : 15 : 14 : 13 : 17 = 100.


Species Oithona attenuata - Plate 19 of morphological figuresIssued from : O. Tanaka in Spec. Publs. Seto mar. biol. Lab., 10, 1960 [Pl. ].
Female: Number of outer marginal spine and inner marginal setae on the exopod of P1 to P4.

Compl. Ref.:
Wilson, 1942 a (p.196); Fagetti, 1962 (p.38); De Decker & Mombeck, 1964 (p.13); Delalo, 1968 (p.138); Kimmerer & McKinnon, 1985 (p.150); Othman & al., 1990 (p.561, 564, Table 1); Yoo, 1991 (tab.1); McKinnon, 1991 (p.471); Shih & Young, 1995 (p.74); McKinnon & Ayukai, 1996 (p.595); Suarez-Morales & Gasca, 1998 a (p.111); Ueda & al., 2000 (tab.1); Uysal & al., 2002 (p.18, tab.1); McKinnon & al., 2003 (p.101, tab.2, fig.11); Hsieh & al., 2004 (p.397, tab.1); Rezai & al., 2004 (p.486, tab.2, 3, abundance, Rem.); Lo & al., 2004 (p.468, tab.2); Hwang & al., 2005 (p.106); Zuo & al., 2006 (p.164: tab.1); Hwang & al., 2006 (p.943, tabl. I); Hwang & al., 2007 (p.25); McKinnon & al., 2008 (p.843: Tab.1, fig.7); Hwang & al., 2010 (p.220, Table 2, fig.3, 4); Hernandez-Trujillo & al., 2010 (p.913, Table 2); Fazeli & al., 2010 (p.153, Table 1); Hsiao S.H. & al., 2011 (p.475, Appendix I); Saitoh & al., 2011 (p.85, Table 5); Uysal & Shmeleva, 2012 (p.909, Table I); Zamora-Terol & Saiz, 2013 (p.376, Rem.: Table 3, egg production); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Tseng & al., 2013 (p.507, seasonal abundance); Hwang & al., 2014 (p.43, Appendix A: seasonal abundance)
NZ: 11 + 1 doubtful

Distribution map of Oithona attenuata by geographical zones
Species Oithona attenuata - Distribution map 3Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.138, Fig.89].
Indo-Pacific geographical distribution of Oithona attenuata
Loc:
South Africa (Cape of Good Hope, E), Atlant. (sporadic after Rosendorn), E Medit. (Lebanon Basin), Red Sea, Gulf of Oman, Arabian Sea, Arabian Gulf, Maldives Is., Madagascar (Nosy Bé), Seychelles, Indian, Nicobar Is., Christmas Is., Straits of Malacca, Indonesia-Malaysia, Samoa (Pago Pago Harbour), China Seas (Yellow Sea, East China Sea, South China Sea), Pa-Li, off SW Taiwan, Taiwan (E, S, W, NE, Tapong Bay, Danshuei Estuary), S Korea, Japan, Palau Is., Pacif. tropical (W & central), W Baja California (Bahia Magdalena), Australia (Melbourne, Great Barrier, Exmouth Gulf, North West Cape, G. of Carpentaria), off Chile
N: 45
Lg.:
(34) F: 1,78; (66) F: 0,8; (109) F: 0,85-0,76; (155) F: 0,88-0,84; (627) F: 0,84-0,78; 0,72-0,66; M: 0,55-0,52; (634) F: 0,88; (937) F: 0,65-0,69; M: 0,52-0,54; (649) F: 0,72-0,82; M: 0,53; (880) F: 0,81-0,82; 0,72-0,87; M: 0,53; (991) F: 0,78-0,84; M: 0,53; (1085) F: 0,6-0,8; M: 0,5-0,6; {F: 0,60-1,78; M: 0,50-0,60}
Rem.: epipelagic.
Given prominence to the 2 forms:
Oithona attenuata latithoracica Früchtl,1923 (F)
Ref.: Früchtl, 1923 (p.451, 454); 1924 b (p.22, 71, fig.); Nishida, 1985 a (p.21, 29); 1986 a (p.914); Othman & al., 1990 (p.561, 564, Table 1);
Loc.: Indien, I. Christmas, Is., Australia (G. of Carpentaria), Aru, mers de Chine, Japon
.
Oithona attenuata latithoracica f. trisetosa Früchtl,1923 (F) Ref.: Früchtl, 1923 (p.451, 455); 1924 b (p.73)
Loc.: Is. Aru.
See in Oithona robertsoni Table 2 from McKinnon (2000, p.108).
See in DVP Conway & al., 2003 (version 1)
Last update : 05/06/2014
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