Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Spinocalanoidea ( Superfamille )
        Spinocalanidae ( Famille )
            Methanocalanus ( Genre )
Methanocalanus gabonicus  Ivanenko, Defaye & Cuoc, 2007   (F,M)
Ref.:
Ivanenko & al., 2007 (p.40, Descr.F,M, figs.F,M, Rem.: internal morphology)
Espèce Methanocalanus gabonicus - Planche 1 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.41, Fig.1].
Female (from off Gabon): A-B, habitus (lateral and dorsal, respectively); C, forhead (ventral); D, A2.

Nota: A1 24-segmented, extending to pedigerous segment 4. A2 endopod shorter than exopodLabrum and paragnaths forming a sort of robust oral cone protruding ventrally.


Espèce Methanocalanus gabonicus - Planche 2 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.42, Fig.2, A-B].
Female (SEM photos): A, anterior part of prosome (ventral); B, labrum paragnaths and mandibular gnathobases.
Abbreviations: a1 = A1; a2 = A2; lb = labrum; pg = paragnath; gn = gnathobase of mandible.Nota: Labrum oroduced ventrally, distal part with a small row of small setules. Paragnaths: a pair of lobes on pedestal produced ventrally and ornamented with numerous setules.


Espèce Methanocalanus gabonicus - Planche 3 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.43, Fig.3].
Female: A, urosome (dorsal); B, A1 (segments 1-17); C, A1 (segments 18-24); D, Md (mandibular palp); E, Md (gnathobase).

Nota: Gnathobase of Md elongate, masticatory edge with 8 teeth and 1 seta ( 3 strong teeth separated from 5 smaller teeth by a groove ornamented with setules); exopod 5-segmented, endopod 2-segmented.


Espèce Methanocalanus gabonicus - Planche 4 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.44, Fig.4].
Female: A, Mx1; A1, proximal basal endite of Mx1; B, Mx2; C, Mxp.

Nota: Praecoxal Mx1 with 13 spines; coxal epipodite and coxal endite with 9 and 4 setae, respectively; 1st and 2nd basal endites each with 4 setae; endopod indistinctly 3-segmented bearing 2, 3 and 3 setae, distal segment with row of setules; exopod as a lobe fused to basis and bearing 8 unequal setae and row of setules.


Espèce Methanocalanus gabonicus - Planche 5 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.45, Fig.5].
Female: A, P1 (anterior); B, P2 (anterior); C, distal segment of exopod of P2 (anterior); D, P3 (anterior); F, inner coxal seta of P4 (anterior).


Espèce Methanocalanus gabonicus - Planche 6 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.42, Fig.2, E, F].
Female (SEM photos): E, endopod of left P1 (anterior); F, lobe of endopod of right P1 (anterior view) (= Von Vaupel Klein's organ).


Espèce Methanocalanus gabonicus - Planche 7 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.42, Fig.2, D].
Female (SEM photos): D, genital double-somite (ventral).
Nota: genital operculum covered the genital atrrium, and laterallythe atrila slits.


Espèce Methanocalanus gabonicus - Planche 8 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.46, Fig.6].
Male: A-B, habitus (lateral and dorsal, respectively); C, anterior part of cephalosome (ventral).
Abbreviations: a1 = A1; a2 = A2; gn = gnathobase of mandible; pm = mandibular palp; lm = labrum.

Nota: labrum flat, not produced ventrally, with pair of distolateral bifid extension. Paragnaths absent.


Espèce Methanocalanus gabonicus - Planche 9 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.48, Fig.8].
Male: A, urosome (ventral); B, left A1 (segments 1-18); B, idem (segments 19-23) D, part of right A1 (two-sided arrows indicate homologous segments of right and left A1; E, A2; F, Md (mandibular palp).

Nota: A1 asymmetrical; left A1 23-segmented; right A1 22-segmented (differs from left antennule in fusion of segments 19 and 20, shape of segments 13-18). Md gnathobase stylet-like, thin and tubiform, pointed and separated terminally; basis with 2 setae, 1st endopod unarmed, 2nd with 8 setae and row of minute spinules; exopod 5-segmented bearing 1, 1, 1, 1, and 2 setae.


Espèce Methanocalanus gabonicus - Planche 10 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.49, Fig.9].
Male: A, Mx1; B, setae of coxal epipodite of Mx1; C, P1 (anterior).


Espèce Methanocalanus gabonicus - Planche 11 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.49, Fig.9].
Male: A, Mx1; B, setae of coxal epipodite of Mx1; C, P1 (anterior).


Espèce Methanocalanus gabonicus - Planche 12 de figures morphologiquesissued from : V.N. Ivanenko, D. Defaye & C. Cuoc in Cah. Biol. Mar., 2007, 48. [p.51, Fig.10].
Male: A, Mx2; B, Mxp; C, P5 (posterior).

Copepodd V male: D, P5.
Nota: Armature of appendages except P5, similar with that of female.

NZ: 1

Carte de distribution de Methanocalanus gabonicus par zones géographiques
Loc:
SE Atlant. (Gabon: continental margin)
N: 1
Lg.:
(974) F: 1,56; M: 1,57; {F: 1,56; M: 1,57}
Rem.: profondeur de l'échantillonnage: 3151-3155 m.
Voir aussi les remarques en anglais
Dernière mise à jour : 17/01/2015

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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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