Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Oithona ( Genus )
Oithona amazonica  Burckhardt, 1912   (F,M)
Syn.: no Oithona amazonica : Ferrari & Bowman, 1980 (p.5, figs.F, Rem.)
Oithona amazonica continentalis : Dussart, 1984 (p.25, 64: occurrence)
Ref.:
Burckhardt, 1912 (p.726, Descr.F,M); 1913 (p.422, figs. F,M); Rosendorn, 1917 a (p.46, Rem. F,M); Kiefer, 1929 g (p.9, Rem.F,M); Sewell, 1948 (p.452); Lindberg, 1955 a (p.466: Rem.); Wellershaus, 1970 (p.481, 482, Rem.F,M); ? Ferrari & Bowman, 1980 (p.6, figs.M, Rem.); Shuvalov, 1980 (p.164, figs.F,M); Rocha, 1985 (p.215, figs.F,M);; Reid, 1985 a (p.27, Rem.); McKinnon, 2000 (p.108, Rem.)
Species Oithona amazonica - Plate 1 of morphological figuresissued from : C.E.F. Rocha in Rev. Hydrobiol. trop., 1985, 18 (3). [p.217, Figs.12-21].
Female (from near Manaus, Brasil): 12, exopod of P1; 13, exopod of P2; 14, exopod of P3; 15, P4 (the arrow indicates the modified seta); 16, P5 and genital segment (lateral).

Male: 17, habitus (lateral); 18, pore signature of the cephalosome flap; 19, caudal ramus; 20, Md (mandibular palp); 21, exopod of P1.

Scale bars = 0.050 mm.

Nota Female:
- Ratio Prosome : Urosome 1.3-1.5 : 1.
- Forehead truncate in dorsal view and curved laterally.
- Rostrum absent.
- Caudal rami twice longer than wide (30 : 15) and little shorter than anal somite; inner apical seta 1.5 times longer than outer one (55 : 37); dorsal seta longer than outer median apical seta, inner median apical seta twice length of outer one and little longer than urosome.
- A1 with 12 segments, reaching the posterior border of the thoracic segment 3 (if bent backwards parallelly to prosome).
- Md with 2 spines different in thickeness and length on basis, both bearing sparse setules; endopod with 5 setae.
- Mx1 with 3 setae on basis and 2 slender, long setae on endopod.
- Number of outer spines of exopod P1-P4: 1, 1, 2; 1, 1, 3; 1, 1, 1; 0, 0, 1; all spines with hyaline membrane on their lateral edges.
- Spines of P1 (fig.12) with flexible whiplike extension each.
- Outer edges of exopodal segment 3 of P1-P3 serrate.
- Rndopodal segment 3 of P4 proximal seta (fig.15) slightly curved, longer and thicker than other seta and without flange on its smooth edge.
- Terminal segment of P5 (fig.16) with seta reaching beyond distal border of genital somite.

Nota Male:
- Ratio Prosome : Urosome = 1.48-1.61 : 1.
- Cephalosome (fig.17) protruded laterally into a flap extending beyond posterior border of thoracic segment 1; porezs signature of flap as in fig.18 (in 3 specimens).
- Caudal ramishorter than anal somite and 1.3-1.5 times longer than wide.
- Md with 5 setae on endopod; spines of basis more similar in length than those in female.
- Exopod of P1 with 3 spines not 2 as in female (fig.21).
- All setae of P1-P4 plumose.


Species Oithona amazonica - Plate 2 of morphological figuresissued from : C.E.F. Rocha in Rev. Hydrobiol. trop., 1985, 18 (3). [p.215, Figs.7-11].
Female: 7-8, habitus (dorsal and lateral, respectively); 9, caudal ramus; 10, Md (mandibular palp); 11, Mx1.
Scale bars: 0.050 mm.


Species Oithona amazonica - Plate 3 of morphological figuresissued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.165, Fig.48]. After Burckhardt, 1913.
Female: A, habitus (dorsal); B, A1; C, forehead (lateral); D, A2; E, Md (masticatory blade); F, Md (mandibular palp); G, Mx1; H, exopod of P1; I-J, 5th thoracic segment and anterior part of genital segment; K, anterior part of abdomen; L, anal segment and caudal rami.


Species Oithona amazonica - Plate 4 of morphological figuresissued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.166, Fig.49]. After Burckhardt, 1913.
Female: A, mx2; B, Mxp; C, P2; D, exopod of P3; E, exopod of P4; F, 5th thoracic segment.


Species Oithona amazonica - Plate 5 of morphological figuresissued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.166, Fig.49]. After Burckhardt, 1913.
Male: A, habitus (dorsal); B-D, A1; E, P1; F, caudal ramus (dorsal).

Compl. Ref.:
Dussart, 1984 (p.25, fig.1, p. 34, 41, 64: occurrence); Dussart & Defaye, 1985 (p.9); Twombly, 1994 (p.234: demography); Carneiro & al., 2003 (p.553); Twombly & al., 2007 (p.628)
NZ: 1

Distribution map of Oithona amazonica by geographical zones
Species Oithona amazonica - Distribution map 2Issued from : H. Bi, K.A. Rose & M.C. Benfield in Mar. Ecol. Prog. Ser., 2011, 427. [p.157, Table 5].
Instantaneous mortality rates (individuals per day) from litterature.
Loc:
S South America (Rivers), Amazon region, Venezuela (Rio Orinoco: Barrancas, Laguna la Orsinera)

Type locality: Marajo Island, Aramà Grande River.
N: 6
Lg.:
? (624) M: 0,57-0,55; (870) F: 0,58-0,64; M: 0,565-0,625; {F: 0,58-0,64; M: 0,55-0,63}
Rem.: Characters female after Rosendorn (1917 a, p.46): Rostrum absent. Setal formula of the exopod swimming legs P1 to P4 (Se = outer setae ; Si = inner setae), P1 : 1, 1, 2 Se ; 0, 1, 4 Si ; P2 : 1, 1, 3 Se ; 0, 1, 5 Si ; P3 : 1, 1, 1 Se ; 0, 1, 5 Si ; P4 : 0, 0, 1 Se ; 0, 1, 5 Si .
See in Oithona robertsoni Table 1 from McKinnon (2000, p.108).
After Rocha (1985, p.216), this species has been recorded in the Amazon delta (Aramà Grande River, Marajo Island; Negro River near Manaus; some lakes on the edges of Solimñoes River(, Nihamundà River; Orinoco Barrancas and Ciudad Bolivar. Predominantly found in non-tidal freswater.
Last update : 11/12/2017
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