Fiche d'espèce de Copépode
Cyclopoida ( Ordre )
    Oithonidae ( Famille )
        Oithona ( Genre )
Oithona bjornbergae  Ferrari & Bowman, 1980   (F,M)
Ref.:
Ferrari & Bowman, 1980 (p.9, figs.F,M); Reid, 1985 a (p.27, fig.M, Rem.); Rocha, 1985 (p.214, figs.F,M); Bradford-Grieve & al., 1999 (p.886, 966, figs.F)
Espèce Oithona bjornbergae - Planche 1 de figures morphologiquesissued from : F.D. Ferrari & T.E. Bowman in Smiths. Contr. Zool., 1980, 312. [p.8, Fig.3].
Female (from mouth of Rio Araca Granda, Brazil): a, habitus (lateral left side); b, forehead (dorsal); c, urosome (lateral left side); d, urosomal segments 2-4 (ventral); e, caudal ramus (dorsal); f, A1; g, A2; h, Mdi, Mx1; j, Mx2; k, Mxp; l, P1; m, P2; n, P3; o, P4.
Nota: Rostrum absent. Urosomal segments 2-4 fringed on posterolateral margin. Urosomal segments 2-3 with one transverse row of minute hairs on ventral surface near posterior margin, urosomal segment 4 with 2 rows. Caudal ramus length 2-times width. Knob near genital opening armed with a small spine


Espèce Oithona bjornbergae - Planche 2 de figures morphologiquesissued from : F.D. Ferrari & T.E. Bowman in Smiths. Contr. Zool., 1980, 312. [p.9, Fig.4].
Male: a, habitus (lateral left side); b, posterior paortion of cephalosome (lateral right side); c, urosome (lateral left side); d, urosomal segments 3-6 and caudal rami (ventral); e, A1.

Nota:
- Head rounded dorsally, laterally slightly more acuminate than female.
- Cephalosome with triangular extension posteriorly toward ventral margin.
- Cephalosome with few unorganized sensor hairs and pores (differ in structure from those of \"pore signature\" in most oithonids).
- Urosomal segments 3-4 with a transverse row of minute hairs on ventral surface near posterior margin, urosomal segment 5 with 2 rows.
- Genital flap with 1 large seta, below it several tiny toothlike spines.


Espèce Oithona bjornbergae - Planche 3 de figures morphologiquesissued from : C.E.F. Rocha in Rev. Hydrobiol. trop., 1985, 18 (3). [p.215, Figs.1-6].
Female (from Manaus, Brazil): 1, caudal ramus; 2, Mx1; 3, exopod of P3 (external and apical edges); 4, exopod of P4 (external and apical edges); 5, endopod of P4.

Male: 6, anal somite and caudal rami (dorsal).

Scale bars = 0.050 mm.
Arrows indicate derails absent in the original description drawings.

Nota Female:
- Caudal rami 2.2-2.4 times longer than wide and as long as anal somite; apical median setae thickened and densely plumose, ending in flexible filament; dorsal seta little shorter than outer median apical seta and twice length of innermost apical seta; outer apical seta about a half length of inner one.
- A1 reaching posterior border of thoracic segment 2.
- Md endopod with 4 setae.
- Mx1 without endopodite and with 3 setae (the median one smootrh) on basis.
- Number of spines on esternal edges of exopod P1 to P4: 1.1.2, 1.1.2, 0.1.1, 0.0.1.
- Exopodal segment 1 of P3 (fig.3) and exopodal segments 1 and 2 of P4 (fig.4) with spinules replacing external, articulated spines.
- Endopod of P4 with 3 modigied setae on internal margin (fig.5)

Nota Male:
- Cephalosome without lateral flap.
- Caudal ramus twice longer than wide and with median apical setae and inner apical seta thickened .
- All setae of endopodal segment of P4 plumose.

NZ: 1

Carte de distribution de Oithona bjornbergae par zones géographiques
Loc:
Brazil (Mouth of Rio Acara Granda, Grande River), Amazon region, Guyana ( St. Jean pond)
Type locality: 01°27.8' S, 48°29.2' W.
N: 3
Lg.:
(624) F: 0,510-0,440; M: 0,480-0,410; (870) F: 0,465-0,500; M: 0,430-0,450; {F: 0,44-0,51; M: 0,41-0,48}
Rem.: saumâtre; épipélagique
Voir aussi les remarques en anglais
Dernière mise à jour : 01/12/2017

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2021. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 04 décembre 2021]

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