Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
Mesaiokeratidae Matthews, 1961 ( Clausocalanoidea )
Ref.: Matthews, 1961 (p.37,38); Andronov, 1974 a (p.1005, 1009); Fosshagen, 1978 (p.182: Definition); Razouls, 1982 (p.373); 1993 (p.310); Bowman & Abele, 1982 (p.9); Huys & Boxshall, 1991 (p.419); Bradford-Grieve, 1994 (p.133, Def.); Bradford-Grieve & al., 1999 (p.881, 902, 904, 935); Ohtsuka & Huys, 2001 (p.461); Boxshall & Halsey, 2004 (p.16; 49; 142: Def., Rem.: p.144); Vives & Shmeleva, 2007 (p.674)
Bradford-Grieve J.M., (2002 onwards). Key to calanoid copepod families. Version 1 : 2 oct 2002. http://www.crustacea.net/crustace/calanoida/index.htm
Rem.: 1 G.: Mesaiokeras.
Famille Mesaiokeratidae - Planche 1issued from : E.L. Markhaseva & F.D. Ferrari in Invert. Zool., 2005, 2 (2). [p.162, Table 4]
Setation of oral parts in females Mesaiokeratidae (Clausocalanoidea) and ancestral condition of setation.

Famille Mesaiokeratidae - Planche 2Issued from : G.A. Boxshall & S.H. Halsey in An Introduction to Copepod Diversity. The Ray Society, 2004, No 166, Part. I. [p.142].
Armature formula of swimming legs P1 to P4.
Setation sometimes reduced; outer spine on 1st and 2nd exopodal segments of P1 lacking in most species.

Nota: Female typically asymmetrical with right leg missing and left leg rudimentary, 2-segmented, with 2nd segment forming a bifid process: rarely both legs present.
- Male P5 asymmetical; right leg reduced to 1 to 3-segmented process; left leg elongate; comprising coxa, elongate basis and 3-segmented exopod; 2nd exopodal seglment sometimes armed with outer spine, ornamented with row of long spinules in Mesaiokeras mikhailini Andronov; distal segment with up to 2 inner elements.
- Eggs released into water.

Famille Mesaiokeratidae - Planche 3Issued from : G.A. Boxshall & S.H. Halsey in An Introduction to Copepod Diversity. The Ray Society, 2004, No 166, Part. I. [p.143, Fig.30].
Mesaiokeratidae. A, Mesaiokeras heptneri habitus female; B, habitus male (lateral); C, P1; D, female P5; E, male P5; F, Mesaiokeras kaufmanni male Md. [Andronov, 1973a: A-E; Fosshagen, 1978: F].
(1) Mesaiokeras Matthews, 1961
Ref.: Matthews, 1961 (p.33, 38); Fosshagen, 1978 (p.183: Def.); Razouls, 1982 (p.373); Huys & Boxshall, 1991 (p.49, 324); Razouls, 1993 (p.310); Bradford-Grieve, 1994 (p.133, Def.); Mauchline, 1998 (p.87, 88: F; p.90: M); Bradford-Grieve & al., 1999 (p.935: spp. Key); Bradford-Grieve, 2004 (p.287); Boxshall & Halsey, 2004 (p.144, spp. Key); Vives & Shmeleva, 2007 (p.675, spp. Key)
Rem.: Formes hyperbenthiques.
A l'occasion de la description de ce nouveau genre, Matthews discute la validité des deux sections Amphascandria et Isokerandria.
La famille des Mesaiokeratidae présente des caractères qui l'apparente à celles des Scolecitrichidae et des Diaixidae.
Type: Mesaiokeras nanseni Matthews,1961. Total: 9 spp.
Remarques sur les dimensions et le sex-ratio:
The mean female size is 0.520 mm (n = 11, SD = 0.231), and the mean male size is 0.490 mm (n = 2, SD = 0.217). The size ratio male: female is 0.942.
If the arctic species (M. spitsbergensis Schulz & Kwasniewski, 2004) is not included, we obtain: mean size female: 0.420 mm (n = 9; SD = 0.0630), and mean male size 0.409 mm (n = 12; SD = 0.0735) and a size ratio male:female 0.973.

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

Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2017. - Diversité et répartition géographique chez les Copépodes planctoniques marins. Disponible sur http://copepodes.obs-banyuls.fr 
[Accédé le 30 avril 2017]

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