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Fiche d'espèce de Copépode |
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Calanoida ( Ordre ) |
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Clausocalanoidea ( Superfamille ) |
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Scolecitrichidae ( Famille ) |
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Rythabis ( Genre ) |
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Rythabis atlantica Schulz, 1995 (F) | |
| | | | | | | Ref.: | | | in Schulz & Beckmann, 1995 (p.202, Descr.F, figs.F); Boxshall & Halsey, 2004 (p.194: figs.F) |  issued from : K. Schulz & W. Beckmann in Sarsia, 1995, 80. [p.200, Fig.1]. Female (from N Greenland Sea): A, habitus (dorsal); B, idem (lateral right side); C, forehead (lateral); D, rostral cone (ventral view); E, posterior part of metasome and urosome (lateral right side); F, idem (ventral; G, A1; H, A2. Scale bars = 0.100 mm. Nota: Cephalosome and pediger 1 as well as pedigers 4 and 5 separated except ventromedial edge of the latter. - Posterior corner of prosome rounded and covering 1/2 of genital double-somite. - Ratio of length of prosome to length of urosome 3.8 : 1. - Urosome of 4 somites. - Genital double-somite only slightly dilated laterally, ventral swelling only weakly produced. Spermathecae curved dforwatd, elongate, digitiform. - Anal somite as long as preceding somite. - Caudal rami slightly longer than wide, armed with 4 distal setaze and a fine ventral seta implanted about 2/3 along medial margin. - Rostrum a simgle cone-shaped knob lacking filaments. - In lateral view, labrum and paragnaths considerably protrudent ventrally (of similar appearance as in Tharybis) and equipped with setules distally. - A1 24-segmented, reaching to end of genital double-somite. - A2 coxa with 1 inner seta; basis bearing 2 unequal setae at inner distal corner; endopod 2-segmented, 1st segment with 2 subterminal inner setae, distal compound segment shorter than preceding , with 8 inner setae on proximal lobe and 6 setae on apical lobe; exopod barely triple length of endopod, 6-segmented, terminal segment longer than endopod , bearing 1 inner seta at 1/4 length and 3 apical setae; setal formula: 0, 1, 1, 1, 1, 4.
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 issued from : K. Schulz & W. Beckmann in Sarsia, 1995, 80. [p.201, Fig.2]. Female: A, right Md (mandibular blade); B, left Md (cutting edge); C, Md (mandibular palp); D, Mx1; E, Mx2; F, Mxp; G, P1; H, P2; I, P3; J, P4; K, P5. Scale bars = 0.100 mm. Nota: Md gnathobase elongate with cutting edge of 3 large, acute teeth ventrally and about 5 smaller teeth and 1 strong setose seta dorsally. Both anterior and posterior sides equipped with needle-like spines. Basis comprising 2 relatively long and curved setae; endopod 2-segmented and slightly larger than exopod, 1st segment with 2 unequal inner setae, and terminal segment bearing 9 setae; exopod indistinctly 5-segmented, 1st to 4th each beraing 1 seta and 5th segment with 2 setae. - Mx1 with praecoxal arthrite with 14 large elements (of these 4 setae located posteriorly); coxal epipodite with 7 large and 2 smaller proximal setae; coxal endite with 5 setae; proximal basal endite bearing 4 and distal endite 5 setae; proximal basal endite with 4 and distal endite 5 setae; exopod with 4 setae and hairs distally; endopod with 3, 6, 3 setae. - Mx2 composed of comparatively short praecoxa and endites carrying 4 and 3 setae. Both coxal endites each with 3 setae; basal endite having 1 robust falcate spine, 2 moderately long spine-like setae and 1 aesthetasc ; Endopod unsegmented with 2 short brush-like filaments proximally (their terminal heads with stiff hairs), and 3 moderately long and 3 long vermiform filaments distally. - Mxp of slender appearance; praecoxa and coxa each with 1 long vermiform seta, 2 long setae and 1 short brush-like aesthetasc proximally and 3 weak setae on distal coxal lobe. Brush-like aesthetasc similar to those of maxillar endopod. Basis comparatively long, of more or less uniform width. Endopod of 6 segments , 1st and 2nd as well as 4th and 5th segments of usual length, 3rd and terminal segment of considerable length. - P5 uniramous, coxae fused to form common base; basis more or less globular; endopod lacking; exopod 1-segmented, slender and slightly longer than basis, with 1 lateral spine at midlength (the shortest), all ornamented with denticles; latral spine about half the length of inner spine; outer distal spine slightly longer than inner distal spine. Posterior surface particularly distally, and inner margins aof all 3 segments armed with numerous spinules.
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Carte de distribution de Rythabis atlantica par zones géographiques
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| | | | Loc: | | | S Iceland.
Type locality: 59°13' N, 20°50' W. | | | | N: | 1 | | | | Lg.: | | | (594) F: 1,14-1,12; {F: 1,12-1,14} | | | | Rem.: | ? hyperbenthique (depths: 2860 m). | | | Dernière mise à jour : 31/03/2016 | |
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 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 21 novembre 2024] © copyright 2005-2024 Sorbonne Université, CNRS
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