Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Euchaetidae ( Famille )
            Paraeuchaeta ( Genre )
Paraeuchaeta gracilicauda  A. Scott, 1909   (F,M)
Syn.: Euchaeta gracilicauda : Vervoort, 1957 (p.77);
No Euchaeta gracilicauda : Sewell, 1929 (p.160, figs.F); no Grice & Hulsemann, 1968 (tab.2); 1969
Euchaeta gracilicauda : Park, 1975 c (p.13, figs.F,M, Rem.)
Ref.:
A. Scott, 1909 (p.72, Descr.F, figs.F); Park, 1994 (p.322, 327, biogéo); 1995 (p.61, Rem.F,M, figs.F,M)
Espèce Paraeuchaeta gracilicauda - Planche 1 de figures morphologiquesissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.165, Fig.55].
Female: a, forehead (left side); b, urosome (left); c, genital somite (left); d, Mx1 (first inner lobe omitted), posterior; e, exopod of P1 (anterior); f, exopod of P2 (anterior).
Nota: Laterally, rostrum of long spiniform, pointing obliquely forward in parallel to anterodorsal margin of forehead.
Genital somite including prominence with a depth-length ratio of about 100:151, with smoothly and broadly curvrd dorsal margin. Genital flange with nearly straight ventral margin and produced distally into a large conical posterior lobe. Posterior edge of genital field extending far beyond genital flange but not projecting into a lobe similar to posterior lobe of genital flange as in P. vorax. Posterior margin of genital prominence smoothly and indistinguishably curving into ventral wall of somite. A low ridge is found on left side of genital somite posterior to genital prominence and close to ventral wall of somite (easily seen when the somite is tilted).
Cephalosomal appendages as in P. malayensis except that outer lobe of Mx1 with 5 long setae. In P1 exopod, outer margin of 1st segment strongly bulging and outer spine very small.

Male: g, forehead (left); h, last pedigerous and genital somites (left); i, exopod of P1 (anterior); j, exopod of P2 (anterior); k, distal exopodal segments of left 5th leg (anterior, tilted counterclockwise); l, idem (lateral).


Espèce Paraeuchaeta gracilicauda - Planche 2 de figures morphologiquesissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.160, Fig.61]. Very doubtful.
Female (from off SE Sri-Lanka): a, posterior thoracic margin and genital segment (lateral left side); b, P1; c, P2 (exopodal segments 2 and 3)


Espèce Paraeuchaeta gracilicauda - Planche 3 de figures morphologiquesissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XVIII, Figs.9-16].
Female (from Banda Sea): 9, habitus (dorsal); 10, forehead (lateral); 11, last thoracic and genital segments (left side); 12, A1; 13, part of one of the distal hairs of Mxp; 14, P1; 15, P2; 16, part of terminal spine (exopodite of P3).


Espèce Paraeuchaeta gracilicauda - Planche 4 de figures morphologiquesissued from : T. Park in Smiths. Contr. Zool., 1975, 196. [p.15, Fig.12].
Female (G. of Mexico): a, forehead (lateral); b, genital segment (lateral); c, same (left side viewed obliquely); d, same (dorsal); e, same (ventral); f, outer coxal lobe of Mx1; g, P1 (anterior); h, P2 (anterior).

Male: i, forehead (lateral); j, P1 (anterior); k, P2 (anterior); l, P5; m, exopod of left P5 (anterior); n, same (medial).

Nota:The species was collected in tows down to depths exceeding 1000 m.


Espèce Paraeuchaeta gracilicauda - Planche 5 de figures morphologiquesParaeuchaeta gracilicauda Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30): malayensis species Group.
2 - Outer spine of 2nd exopodal segment (or the 2nd of the first 2 exopodal segments forming a proximal, compound segment) of P1 normally developed (Fig.55-e).
3 - Outer lobe of Mx1 with 5 long setae (Fig.55-e).
4 - Laterally, genital prominence low with more or less convex genital flanges (Fig.55-c).
5 - Laterally, rostrum well developed (Fig.55-a).
6 - Laterally, posterior margin of genital prominence smoothly merging into posterior ventral wall of somite (Fig.55-c).
7 - Genital somite without conspicuously ridged outgrowth on left side posterior to genital prominence (Fig.55-c).
8 - Laterally, rostrum very elongated, pointing somewhat ventrad (Fig.55-a).

Ref. compl.:
Sewell, 1948 (p.540, 552); Suarez-Morales & Gasca, 1998 a (p.109)
NZ: 7

Carte de distribution de Paraeuchaeta gracilicauda par zones géographiques
Espèce Paraeuchaeta gracilicauda - Carte de distribution 2
Carte de 1996
Espèce Paraeuchaeta gracilicauda - Carte de distribution 3issued from : T. Park in Hydrobiologia 292/293, 1994. [Fig. 3, p.327]. Geographical distribution of Paraeuchaeta gracilicauda (lozange).
Loc:
G. of Mexico, Caribbean Sea, Indonesia-Malaysia, Philippines, China Seas (South China Sea), Coral Sea , Pacif (tropical), Tasman Sea, Baja California, central America
N: 3
Lg.:
(3) F: 7,9-6,2; M: 6,5-6,2; (5) F: 7; (19) F: 6,0-6,41; M: 6,35-6,41; {F: 6,00-7,90; M: 6,20-6,50}
Rem.: Park (1995, p.61) n'inclut pas l'océan Indien dans la distribution de cette espèce, mais le Pacifique (zones tropical et tempéré), la Mer de Chine méridionale, l'Archipel malais. la Mer de Corail, la Mer te Tasman, le Golfe du Mexique et les Caraïbes, mais n'a pas été notée dans le reste de l'Atlantique.
Voir aussi les remarques en anglais
Dernière mise à jour : 26/08/2019

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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 09 mai 2021]

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