Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Arietelloidea ( Superfamille )
        Arietellidae ( Famille )
            Crassarietellus ( Genre )
Crassarietellus huysi  Ohtsuka, Boxshall & Roe, 1994   (F)
Syn.: ? Crassarietellus sp. (M) Ohtsuka & al., 1994 (p.116, figs.M)
Ref.:
Ohtsuka & al., 1994 (p.109, Descr.F, figs.F, Rem.M); Boxshall & Halsey, 2004 (p.63: fig.F)
Espèce Crassarietellus huysi - Planche 1 de figures morphologiquesissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.110, Fig.1].
Female (off W Africa): A, habitus (dorsal); B, idem (lateral left side); G, urosome (ventral); D, genital double-somite (ventral); E, idem (lateral ); F, A2 (one terminal seta on 2nd endopod segment missing); G, terminal part of 2nd endopod of other A2.
Scale bars in mm.

Nota: Cephalosome and 1st pedigerous somite separate, 4th and 5th fused. Urosome 4-segmented. Anal somite small, anal operculum not developed. Caudal rami loner than wide, fringed with long setules along inner margin, with vestigial seta I and developed setae II to VI, seta VII originating dorsally nera base of seta VI (Fig.1C); inner margin near anus with patch of minute spinules. Integument of body and appendages pitted. A2 with coxa unarmed; basis with spinulose seta at inner angle; endopod 2-segmented, 1st segment with minute seta at 3/4 length, covered with minute spinules distally, 2nd segment with 3 setae of unequal lengths medially and 5 setae distally and sparsely covered by spinules; exopod indistinctly 10-segmented, 2nd to 4th segments almost fused (setal formula: 0, 0, 0, 1, 1, 1, 1, 1, 0, 3, respectively), 9th segment sparsely ornamented with minute spinules.


Espèce Crassarietellus huysi - Planche 2 de figures morphologiquesissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.111, Fig.2].
Female (SEM micrographs): A, genital double somite (ventral; arrows indicating positions of copulatory pores); B, gonopore and copulatory pore (indicating by arrow); C, right gonopore; D, left gonopore (with remnant of spermatophore).
Scale bar: 0.200 mm (A); 0.100 mm (B); 0.030 mm (C-D). Holotype: F-G; parattype: A-E.


Espèce Crassarietellus huysi - Planche 3 de figures morphologiquesissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.113, Fig.4].
Female: A, A1 (segments I to XV; B, idem (segments XVI to XXVIII); C, idem (segments XXII to XXVIII); D, Md; E, praecoxal arthrite and coxal endite of Mx1; F, proximal spine on praecoxal arthrite of Mx1.
Scale bars in mm. Holotype: E,F; paratype: A-D.

Nota: A1 equal in length, distinctly 22-segmented, reaching to posterior end of 2nd pedigerous somite; distal 2 segments incompletely fused.
Md with ganthobase heavily chitinized, ventromedial margin with dense fringe of long setules, cutting ede with 3 acute teeth (dorsalmost of which bifid at tip), 2 patches of dagger-like spinules present dorsally, tuft of long setules present medially on kno; basis of palp with patches of minute spinules and row of long setules proximally (almost missing in Fig.4D); endopod rudimentary, 1-segmented, with 2 plumose setae of unequal lengths; exopod 5-segmented (almost completely separate), 1st to 4th segments each with 1 seta, terminal segment with 2 setae (one of which thinner and shorter than other), 2nd segment with patch of minute spinules.
Mx1 with praecoxal arthrite with 5 stout spines (2 of which bearing 2 rows of strong spinules, and 1 process; patch of long setules and numerous minute spinules of various sizes along inner margin and patch of fine prominences along outer margin.


Espèce Crassarietellus huysi - Planche 4 de figures morphologiquesissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.114, Fig.5].
Female: A, Mx1 (arrowhead indicating endite seta of basis); B, Mx2; C, Mxp the armature elements on the 6th endopod segment are identified individually by the letters a to d).
Scale bars in mm. Holotype: C; paratype: A-B.

Nota: Mx1 coxal epipodite with 6 setae; coxal endite with elongate, spinulose seta terminally; basis with minute enditic seta (arrowhead in fig.5A) and row of long, fine setules along inner margin; endopod rudimentary, 1-segmented, bearing 2 spinulose setae of unequal lengths distally; exopod lamellar, with 3 long, plumose setae distally.
Mx2 stout, with 1st praecoxal endite with 2 spinulose setae and vestigial element; 2nd praecoxal and both coxal endites each carrying 2 spinulose setae; basal endite with long, subterminal spine with 2 rows of spinules medially; endopod 4-segmented, 1st segment with 1 spinulose seta, 2nd to 4th segments with 3, 2, and 2 long spinulose setae, respectively.
Syncoxa of Mxp with 1 medial and 2 subterminal setae and patch of fine spinules subterminally; basis bearing 2 patches of spinules proximally and midway along inner margin and 2 spinulose subterminal setae; endopod 6-segmented, 1st segment incompletely fused with basis, 1st to 6th segment with 1, 4, 4, 3, 3, 4 setae, respectively; 6th segment with setae a and b well developed, seta c chitinized, bering row of simple spinules along inner margin, seta d long, with inner row of simple spinules.


Espèce Crassarietellus huysi - Planche 5 de figures morphologiquesissued from : S. Ohtsuka, G.A. Boxshall & H.S.J. Roe in Bull. nat. Hist. Lond. (Zool.), 1994, 60 (2). [p.115, Fig.6].
Female: A, 2nd endopod segment of Mxp; B, 3rd endopod segment of Mxp (innermost seta indicated by arrowhead); C, 4th endopod segment of Mxp (innermost seta indicated by arrowhead); D, P1 (anterior); E, P2 (posterior); F, aberrant P3 (anterior); G, right endopod of P3 (anterior); H, another aberrant P3 (posterior); I, extremely aberrant P3 (anterior); J, P4 (posterior); K, left P5 (anterior); L, right P5 (anterior).
Scale bars in mm. Holotype: A-C, J-L.

Nota: Both legs of P5 almost symmetrical; right and left coxae incompletely separate from intercoxal sclerite; basis with relatively narrow base, with plumose deta at outer angle; endopod small, 1-segmented, distinctly separate from basis, with inner medial and terminal plumose seta; exopod indistinctly 3-segmented, each almost fused, 1st and 2nd segment with serrate spine at outer angle, 3rd with 2 terminal and 1 lateral spines.
Remarks: P3 with several aberrations: extra spine present on each of 1st (Fig.6F) and 3rd exopod segments (Fig.6F,H); extra seta on 1st (Fig.6H) and 2nd endopod segments (Fig.6F); fewer seta on 3rd endopod segment (Fig.6F); both rami extremely abnormal (Fig.6,I). The paratypic females have aberrant P3 (Fig.6F,H,I). Both paratypes have 4 outer spines on the 3rd exopodal segment, but it is likely that the segment normally has 3 outer spines, because the males of Crassarietellus sp. and other arietellids carry only 3 spines on this segment. An additional spine on the 1st exopodal segment of P3 has also been reported in specimens of some shallow-water hyperbenthic and cave-dwelling species of the calanoid family Pseudocyclopiidae. The presence of a seta on the outer margin of the 2nd endopodal segment of P3 is unique for the Calanoida.

Ref. compl.:
Bradford-Grieve, 2004 (p.283)
NZ: 1

Carte de distribution de Crassarietellus huysi par zones géographiques
Loc:
NE Atlant. (off N Cape Verde Is.)

Type locality: 20°8.5'N, 21°1.2'W.
N: 1
Lg.:
(263) F: 3,88; 3,85; {F: 3,85-3,88}
Rem.: hyperbenthique (± 4000 m)
Dernière mise à jour : 05/12/2014

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

Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2024. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 29 mars 2024]

© copyright 2005-2024 Sorbonne Université, CNRS

Webmaster
Mentions légales et informations nominatives
CNRS   Observatoire Océanologique de Banyuls sur Mer - Laboratoire Arago
Sorbonne Université

 

Version française
English version

 

Rechercher

Sur le WEB du CNRS

 


Copépodes planctoniques marins

Copépodes planctoniques marins

 

Imprimer Contact Accueil Plan du site Accès restreint Retour Une du Labo Imprimer Contact Plan du site Crédits Téléchargez les Plug-Ins