Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Gaetanus ( Genre )
Gaetanus minispinus  Tanaka, 1969   (F)
Ref.:
Tanaka, 1969 (p.260, Descr.F, figs.F); Tanaka & Omori, 1970 (p.140); Park, 1975 a (p.10); Bradford & Jillett, 1980 (p.51, figs.F, distribution chart); Markhaseva, 1996 (p.204, figs.F)
Espèce Gaetanus minispinus - Planche 1 de figures morphologiquesissued from : J.M. Bradford & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 86, 1980. [p.54, Fig.35].
Female: A, habitus (dorsal); B, forehead (lateral); C, posterior of thorax (lateral left side); D, lamella on basipod 1 of Mxp.

Nota: The one specimen taken in the south-west Pacific has the lamella of Mxp basipod 1 and the external spine of P1 exopod joint 2 not noticeably different from that of G. kruppi, and A1 did not appear to be as long as described by Tanaka (1969).


Espèce Gaetanus minispinus - Planche 2 de figures morphologiquesissued from : O. Tanaka in Publ. Seto Mar. Lab., 1969, XVII (4). [Fig.4].
Female (from China Sea): a, forehead (lateral); b, last thoracic segment and urosome (lateral right side); c, idem (dorsal); d, A2; e, Mx1; f, Mxp (basal segment); g, P1 (exopod); h, P4; i, lamellous process of 1st basal segment of Mxp in Gaetanus kruppi female from Giesbrecht.

Nota Female:
- Proportional lengths of cephalothorax and abdomen 78 : 22.
- Cephalic spine very small.
- Rostrum short, point-like, directed ventrally.
- Head and 1st thoracic segment fused, 4th and 5th fused.
- Posterolateral corners of the last thoracic segment rounded, with a small lateral spine on the distal margin.
- Proportional lengths of urosomites and caudal rami 38 : 17 : 16 : 10 : 19 = 100.
- Genital segment symmetrical, swollen ventrally, the distal margin striated with spinules.
- Caudal rami as long as wide.
- A1 24-segmented (segments 8-9 fused), extends beyond the end of caudal rami by the distal 2 segments.
- A2 exopod about as long as endopod.
- Md with 9 setae on the distal margin of the endopod; cutting edge with 8 teeth and 1 inner marginal seta.
- Mx1: 9 setae on the outer lobe, 11 setae on exopod, 4 + 4+ 6 on endopod, 5 on the 2nd basal segment, 4 on the 3rd inner lobe, 4 on the 2nd inner lobe, 14 on the 1st inner lobe (= arthrite).
- Mx2 robust, with the proximal outer margin of the 1st basal segment swollen endopod with 6 setae, the 5th inner lobe with 2 spines on the anterior distal margin.
- Mxp with 1st basal segment furnished with a lamellous process on the outer margin (which differs in shape from that of G. kruppi.
- P1 exopod 2-segmented (segments 1 and 2 incompletely fused), endopod 1-segmented; the outer marginal spine of the 2nd segment long, reaching the distal margin of the 3rd exopodal segment.
- P2 exopod 3-segmented and endopod 2-segmented; the terminal spine of exopod with 21 teeth.
- P3 and P4 with exopods and endopods 3-segmented each.
- P4 with the 1st basal segment (= coxa) furnished with about 23 bristles on the inner margin.


Espèce Gaetanus minispinus - Planche 3 de figures morphologiquesGaetanus minispinus female:
1 - Anterior part of cephalon with frontal spine.
2 - Exopodal segment 1 of A2 without seta; exopodal segment 2 with 1 seta (near distal margin). 2nd internal lobe of Mx1 with 4 setae. Exopod of P1 always with 2 external spines.
3 - Mxp protopodite with lateral plate.
4 - Exopodal segment 2 of A2 with 1 seta.
5 - Spines of last thoracic segment not exceeding the midlength of genital segment. Frontal spine small.


Espèce Gaetanus minispinus - Planche 4 de figures morphologiquesissued from : O. Tanaka in Publ. Seto Mar. Lab., 1969, XVII (4). [p.261].
Female A1: Proportional lengths of segments.
-Nota: A1 24-segmented, segments 5-9 fused.

NZ: 4

Carte de distribution de Gaetanus minispinus par zones géographiques
Espèce Gaetanus minispinus - Carte de distribution 2Issued from : J.M. Bradford & J.B. Jillett in New Zealand Ocean. Inst. Memoir, 86, 1980. [p.89, Figs.64].
Distribution of several species of Gaetanus in the Tasman Sea and around New Zealand.
Loc:
Japan (Izu), China Seas, Pacif. (equatorial), NW New Zealand .

Type locality: South China Sea.
N: 4
Lg.:
(105) F: 5,5; (113) F: 5,56-5,15; (201) F: 5,4; {F: 5,15-5,56}
Rem.: méso-bathypélagique.
Voir aussi les remarques en anglais
Dernière mise à jour : 28/03/2017

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