Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Euchaetidae ( Famille )
            Paraeuchaeta ( Genre )
Paraeuchaeta tycodesma  (Park, 1978)   (F,M)
Syn.: Euchaeta antarctica Giesbrecht, 1902 (p.22, figs.M);
Euchaeta tycodesma Park, 1978 (p.229, Descr.F, figs.F); Fontaine, 1988 (p.45, figs.F,M)
Bradford, 1981 (p.391, 401, figs.M); Bradford & al., 1983 (p.25); Park, 1994 (p.321); 1995 (p.91, Rem.)
Espèce Paraeuchaeta tycodesma - Planche 1 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.230, Fig.83]. As Euchaeta tycodesma
Female: A, forehead (lateral); B, C, D, distal end of metasome and genital segment (ventral, left side, right side, respectively); E, outer lobe of Mx1; F, P1; G, P2. P1-2: legs (anterior).

Espèce Paraeuchaeta tycodesma - Planche 2 de figures morphologiquesissued from : J.M. Bradford in N.Z. Jl Mar. Freshw. Res., 1981, 15 (4). [p.399, Fig.8].
male: (from McMurdo Sound): A, P5 (clasping a spermatophore); B, terminal part of left exopod of P5; C, serrated lamella; D, exopod of P1; E, terminal part of exopod of P2.

Espèce Paraeuchaeta tycodesma - Planche 3 de figures morphologiquesissued from : J.M. Bradford in N. Z. Jl Mar. Freshw. Res., 1981, 15. [p.395, Fig.4, E', F', E\", F\"] .
Male: e', F', terminal part of P5; E\", F\", serrated lamella.

Nota: The serrated lamella is shaped rather like that of P. erebi but is shorter relative to the 3rd exopodal segment, being 3/5 its length

Espèce Paraeuchaeta tycodesma - Planche 4 de figures morphologiquesissued from : J.M. Bradford in N. Z. Jl Mar. Freshw. Res., 1981, 15. [p.401, Table 5 (part.)].
Female & Male (from Giesbrecht, 1902): Distinguishing features of species of Paraeuchaeta closely related to P. antarctica (* for code see p.393, Fig.2 in P. erebi).

Espèce Paraeuchaeta tycodesma - Planche 5 de figures morphologiquesissued from M. Fontaine in Biol. Antarctic Seas XIX, Antact. Res. Ser., 1988, 47. [p.44, Fig.14]. As Euchaeta tycodesma.
Female (from Ross Sea): A-C, genital segment (right lateral, left lateral, and ventral, respectively); D, Md (gnathobase); E, Md (mandibular palp); F-G, Mx1.
Scale bars: 0.5 mm each.Nota: Mxp without ''flagellum'' or tiny spinules on the tips of the strong setae of the endopod.

Espèce Paraeuchaeta tycodesma - Planche 6 de figures morphologiquesissued from M. Fontaine in Biol. Antarctic Seas XIX, Antact. Res. Ser., 1988, 47. [p.45, Fig.15]. As Euchaeta tycodesma.
Female: A, P1; B, P2.
Nota: Relative lengths of outer edge spines and setae (code see in P. antractica). Exopod of P1: Aa AB; Bb ± 5/4 BC; Cc = 4/3 BC. Exopod of P2: Aa ± 3/2 AB; Bb ± 1/2 BC; Cc < CD.

male: distal end of left P5 (medial).

Espèce Paraeuchaeta tycodesma - Planche 7 de figures morphologiquesissued from : W. Giesbrecht in Copepoden. Res. voyage du S. Y. Belgica. Rapports scientifiques, Zoologie, 1902. [Taf. III, Figs. 4, 6-8]. As Euchaeta antarctica.
Male (from S Peter Ist Island, Bellingshausen Sea): 4, P1; 6, exopodite 3 of P2; 7, P5 with spermatophore (anterior); 8, distal part of left P5.

Nota: For Bradford (1981, p.401) this male assigned to P. antarctica by Giesbrecht (1902) and P. tycodesma are undoutedly conspecific in view of the size and shape of the serrated lamella and the size of the spermatophore held in the P5.

Espèce Paraeuchaeta tycodesma - Planche 8 de figures morphologiques
Paraeuchaeta tycodesma Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30).
2 - None of endopodal setae of Mx2 armed with long spinules in addition to usual spinules.
3 - Genital segment without transverse ridge on ventral side anterior to genital prominence.
4 - Ventrally, genital field more or less symmetrical (Fig.83 B in Park, 1978).

Ref. compl.:
Razouls & al., 2000 (p.343, tab. 2, 5, Appendix); Park & Ferrari, 2009 (p.143, Table 3, 8, Appendix 1, biogeography)
NZ: 1

Carte de distribution de Paraeuchaeta tycodesma par zones géographiques
Espèce Paraeuchaeta tycodesma - Carte de distribution 3issued from M. Fontaine in Biol. Antarctic Seas XIX, Antact. Res. Ser., 1988, 47. [p.43, Fig.13].
Occurrence of P. tycodesma.
Open circles show stations where no adults were found. RSSW = Ross Sea Shelf Water; CDW = Circumpolar Deep Water.

Nota: For Fontaine (1988, p.46) P. tycodesma is restricted to the Ross Sea in its distribution Although in this material P. tycodesma was collected only in the southeastern part of the Ross Sea, north of Ross Island, Park’s specimens were collected well out in the middle of the Ross Sea, probably in Circumpolar Deep Water. The male was described by Bradford (1981) from material collected from under the ice in McMurdo Sound.
Antarct. (SW Pacif., Ross Sea, McMurdo Sound, Bellingshausen Sea).

Type locality: 74°09'-74°12'S, 174°53'-174°46'W.
N: 5
(20) F: 10,16-9,83; (33) M: 6,75; (103) F: 10,2-9,8; M: 6,9-6,4; (397) F: 10,5; 10,2; M: 7,8; 7,6; {F: 9,80-10,50; M: 6,40-7,80}

The mean female size is 10.115 mm (n = 6; SD = 0.2627), and the mean male size is 7.090 mm (n = 5; SD = 0.5899). The size ratio is about 0.701, or ± 70 %.
Rem.: Sampling depth (Antarct.) : 0-2000 m.
Voir aussi les remarques en anglais
Dernière mise à jour : 12/08/2016

 Toute utilisation de ce site pour une publication sera mentionnée avec la référence suivante :

Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2022. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur [Accédé le 21 mai 2022]

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