Oithona amazonica - Fiche d'espèce - Copépodes planctoniques marins

Oithona amazonica Burckhardt, 1912 (F,M)

Taxonomy

Ordre Cyclopoida

détails

Famille Oithonidae

détails

Genre Oithona

détails liste des espèces pour ce genre

Abréviations ou symboles

Synonymie

no Oithona amazonica : Ferrari & Bowman, 1980 (p.5, figs.F, Rem.)
Oithona amazonica continentalis : Dussart, 1984 (p.25, 64: occurrence)

Références

Liste des auteurs étudiés

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.)

Figures

Planche 1 issued 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 - Planche 2 of morphological figures

Planche 2 issued 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 - Planche 3 of morphological figures

Planche 3 issued 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 - Planche 4 of morphological figures

Planche 4 issued 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 - Planche 5 of morphological figures

Planche 5 issued 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).

Références complémentaires

Liste des auteurs étudiés

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)

Distribution

NZ: 1

Carte de distribution de Oithona amazonica par zones géographiques

Cartes et graphiques additionels

Carte 2 Issued 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.

Localisations

Glossaire géographique

S South America (Rivers), Amazon region, Venezuela (Rio Orinoco: Barrancas, Laguna la Orsinera)

Type locality: Marajo Island, Aramà Grande River.

Citations

N: 6

Dimensions (mm)

Références de auteurs concernant les dimensions

? (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}

Remarques

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.

Dernière mise à jour : 11/12/2017