Fiche d'espèce de Copépode
Cyclopoida ( Ordre )
    Oithonidae ( Famille )
        Oithona ( Genre )
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); Kos, 1972 (Vol.I, figs.F, Rem.); 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.); Yoo & Lim, 1993 (p.91, 93, 100, Table 1), 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), Rosa & al., 2019 (p.3, 4, figs.F, Rem.)
Espèce Oithona attenuata - Planche 1 de figures morphologiquesIssued 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).


Espèce Oithona attenuata - Planche 2 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 3 de figures morphologiquesIssued 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).


Espèce Oithona attenuata - Planche 4 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 5 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 6 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 7 de figures morphologiquesIssued 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).


Espèce Oithona attenuata - Planche 8 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 9 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 10 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 11 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 12 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 13 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 14 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 15 de figures morphologiquesissued 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.


Espèce Oithona attenuata - Planche 16 de figures morphologiquesissued 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).


Espèce Oithona attenuata - Planche 17 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 18 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 19 de figures morphologiquesIssued 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.


Espèce Oithona attenuata - Planche 20 de figures morphologiquesIssued from K.-I. & D.-H. Lim in The Korean J. Syst. Zool., 1993, 9 (2). [Key of female]: ]Morphological characters of Oithona attenuata female in Korean waters :
1 - Anterior part of prosome rounded in dorsal view.
2 - Rostrum blunt.
3 - P5 with 1 seta.
4 - Length of A1 same as that of prosome.
4 - Length of 1st spine in inner lobe 1 of Mx1 more than 2 times of that of other spines.


Espèce Oithona attenuata - Planche 21 de figures morphologiquesIssued from : J. da Cruz Lopes da Rosa, W.M. Monteiro-Ribas, L. Lemos Batista & L. Dias de Almeida Fernandez in Naoplius, 2019, 27: e2019001. [p.3, Fig.2].
Oithona attenuata Female (from Cabo Frio Island: 22°59'86''S, 42°00'28''W): a, habitus (dorsal); b, P3; c, P4; d, last urosomal segments and caudal rami.

Nota: Temperature approximately 24.4 °C and 35.9 psu at the end of the austral summer (March) and approximately 21.5 °C and 34.5 psu in autumn (May). The higher abundance (125 ind. per m3) in more saline waters.

Nota: - Ratio prosoe : urosome = 0.856.
- Forehead not produced into pointed rostrum
- P1 exopodite and endopodite 3-segmented.
- P1-P4: exopodite outer spine formula otherwise arranged (Oithona).
- P4 exopodite with 2 outer spines.
- P5: free segment with only 1 terminal seta or 1 terminal seta and 1 marginal spinule.
- Md with 1 strong spinulose spine and 1 fine seta on distal end.
- Mx1 endopod with 4 setae.
- Mx2 with inner lobe 1 with distal marginal setae about twice longer than other setae.
- Caudal rami about 4 times longer than wide, with 6 plumose setae.

For the authors, this species may have come from the Indian Ocean from a whirlwind and arriving in Brazil (according to Villar & al. (2015) plankton can be transported by Agulhas rings escaping the Indian Ocean, entering Cape Basin, and drifting northwesterly across the South Atlantic, and finally reaching the South American continent over the course of several years). The absence of more individuals in samples collected during ongoing monitoring in the following months lead to conclude that O. attenuata did not successfully reach the status of an introduced species. This species is the first record in Brazil, from a coastal station in March and May 2011.

Ref. compl.:
Wilson, 1942 a (p.196); Fagetti, 1962 (p.38); De Decker & Mombeck, 1964 (p.13); Delalo, 1968 (p.138); Dussart, 1984 (p.25, 64: occurrence): 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); Noda & al., 1998 (p.55, Table 3, occurrence); Suarez-Morales & Gasca, 1998 a (p.111); Ueda & al., 2000 (tab.1); Ueda, 2001 (p.96, as ''srocky form'', occurrence); 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); Tseng L.-C. & al., 2008 (p.153, fig.5, Table 2, occurrence vs geographic distribution, indicator species); McKinnon & al., 2008 (p.843: Tab.1, fig.7); Hwang J.-S. & al., 2010 (p.220, Table 2, fig.3, 4, %, abundance); Hernandez-Trujillo & al., 2010 (p.913, Table 2); Fazeli & al., 2010 (p.153, Table 1); Hsiao S.H. & al., 2011 (p.475, Appendix I); Chew & Chong, 2011 (p.127, Table 3, abundance vs location); Zhang G.-T. & Wong, 2011 (p.277, fig.6, 7, abundance, indicator); Kâ & Hwang, 2011 (p.155, Table 3: occurrence %); Tseng L.-C. & al., 2011 (p.47, Table 2, occurrences vs mesh sizes); Saitoh & al., 2011 (p.85, Table 5); Beltrao & al., 2011 (p.47, Table 1, density vs time); 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); Zamora Terol, 2013 (p.163, 164: Table 2, 3, 4: clearance rates vs. diets, ingestion, egg production, Table 5: fecundity); Hwang & al., 2014 (p.43, Appendix A: seasonal abundance); Ben Ltaief & al., 2017 (p.1, Table III, Summer relative abundance)
NZ: 12 + 1 douteuse

Carte de distribution de Oithona attenuata par zones géographiques
Espèce Oithona attenuata - Carte de distribution 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
Espèce Oithona attenuata - Carte de distribution 4Issued from : J.-S. Hwang, R. Kumar, H.-U. Dahms, L.-C. Tseng & Q.-C. Chen in Zool. Studies, 49 (2). [p.224, Fig.3).
Average abundances of six Oithona species recorded in the South China Sea from Mar. 2000 to Oct. 2002.
Sampling stations between 16-24° N, 114-120° E.
Loc:
South Africa (Cape of Good Hope, Eastern), Cabo Frio Island (SW Brazil), Atlant. (sporadic after Rosendorn), E Medit. (G. of Gabes, 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, Sangga estuary (mainly nearshore and off shore), Indonesia-Malaysia, Samoa (Pago Pago Harbour), China Seas (Yellow Sea, East China Sea, South China Sea), Hong Kong, Pa-Li, off SW Taiwan, Taiwan (E, S, W, NE, Tapong Bay, Danshuei Estuary), Okinawa (lagoons), Korea (E, S & W), S Japan (Kuchinoerabu Is.), Japan, Ariake Bay, 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: 58
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; (1227) F: 0,62-0,63 {F: 0,60-1,78; M: 0,50-0,60}
Rem.: épipélagique.
Mise en évidence de 2 formes :
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)
Loc.: Indien, I. Christmas, Is. 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
Voir aussi les remarques en anglais
Dernière mise à jour : 22/09/2020

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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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