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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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Diaixidae ( Famille ) |
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Byrathis ( Genre ) |
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Byrathis macrocephalon (Grice & Hulsemann, 1970) (F) | |
| | | | | | | Syn.: | Xanthocalanus macrocephalon Grice & Hulsemann, 1970 (p.191, Descr.F, figs.F); Bradford, 1973 (p.139, 147, Rem.); Bradford & al., 1983 (p.127); Schulz & Beckmann, 1995 (p.210, Rem.);
Tharybis macrocephalon: Ferrari & Markhaseva, 2005 (Rem.: p.33; p.46: tab.1, Rem.) | | | | Ref.: | | | Markhaseva & Ferrari, 2005 a (p.139, figs.F, tab.2, Rem..) |  issued from : E.L. Markhaseva & F.D. Ferrari in Invert. Zool., 2005, 2 (2). [p.142, Fig.18]. Female (from holotype): A, posterior prosome and urosome (lateral, right side); B, A2 (exopod); C-D, Md (gnathobase; posterior and proximal, respectively); E, Mx2 (praecoxal, coxal and proximal basal endites); F, Mx2 (sensory setae of distal basal endite + ramus); ; G, Mxp (syncoxa); H, P1 (distal part of basis and endopod; anterior). Scale bars: 0.1 mm. Nota: Prosome 4.6-5.4 times longer than urosome. - Cephalosome fused with pediger 1, pedigers 4 and 5 fused dorsally, separate laterally. - Anterior cephalosome rounded dorsally. - Posterior corners of prosome produced into short, indented lobe in lateral view. - Genital complex symmetrical, spermathecae elongate, dorsal part directed dorsally. - Rostrum: 2 short, thin filaments. - A1 24-segmented. A2 coxa with 1 seta; basis with 2 setae; endopod 2-segmented, proximal segment with 1 seta; distal with 14 (6 terminal and 8 sub-terminal setae); exopod 8-segmented with 1, 3, 1, 1, 1, 1, 1, 3 setae. - Md gnathobase with tooth-like knob on posterior face, cutting edge wide with 8 teeth and 1 seta; basis with 3 setae; endopod 2-segmented, proximal with 2 setae, distal with 9 setae; exopod with 1, 1, 1, 1, 2 setae. - Mx1 praecoxal endite with 2 posterior and 9 terminal setae, proximal 2 terminal setae curved proximally; coxal endite with 2 setae, coxal epipodite with 7 setae; proximal basal endite with 2 setae, distal with 3 setae (1 of them small); endopod with 7 setae in groups of 2+5; exopod with 4 setae. - Mx2 proximal praecoxal endite with 4 setae, distal with 3 setae, 1 thicker; proximal coxal endite with 3 setae, 1 thicker; distal with 3 setae, 1 thicker; proximal basal endite with 4 setae, 1 thicker, 1 worm-like; distal basal endite +ramus with 5 worm-like and 3 brush-like sensory setae, 1 brush-like seta thicker and with longer setules. - Mxp praecoxal endites of syncoxa with 1, 2, 3 setae, 1 worm-like; coxal endite with 3 setae; basis with a row of small denticles proximally, 3 medial setae, 2 setae on distal endite; endopod of 5 segments with 4, 4, 3, 3+1 lateral and 4 setae. - P1 coxa without seta; basis with medial seta; endopod with 3 medial and 2 terminal setae; Von Vaupel Klein's organ with basal seta slightly curved, anterior knob rounded and with denticles; exopod 3-segmented, proximal with 1 lateral seta, middle with 1 medial and 1 lateral seta, distal with 3 medial, 1 terminal, 1 lateral seta; lateral seta on proximal segment exceeds the base of lateral setae of following segment, lateral seta on middle segment exceeds half length of lateral seta of terminal segment. - P2-P4 as described by Grice & Hulsemann (1970). - P5 3-segmented: exopod (distal segment) with 1 long medial and 1 short lateral setae, and 1 subterminal and 1 terminal attenuation. - Caudal rami with 4 large, thick terminal setae, 1 small dorsal seta and 1 small medial ventral seta.
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 issued from : E.L. Markhaseva & F.D. Ferrari in Invert. Zool., 2005, 2 (2). [p.137, Table 2]. Byrathis macrocephalon (Selected character states of species included in Byrathis gen. n.). Ce = cephalosome; Mn = mandible; Pd = pediger segment; Ri = endopod; Re = exopod
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 issued from : E.L. Markhaseva & F.D. Ferrari in Invert. Zool., 2005, 2 (2). [p.138, Table 2 (contituing)]. Byrathis macrocephalon (Selected character states of species included in Byrathis gen. n.). Ri = endopod; Re = exopod.
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 Issued from : G.D. Grice & K. Hülsemann in Bull. Mus. Comp. Zool., Harvard, 1970, 139 (4). [p.208-209, Pl. VI, Figs. 111-116]. As Xanthocalanus macrocephalon. Female (from 39°45.2'N, 70°33.8'W): 111-112, habitus (lateral and dorsal, respectively); 113, forhead (lateral); 114, same (ventral); 115, 5th thoracic segment and urosome (lateral); 116, right A1. Nota : - Head and 1st thoracic segment fused, separation indicatd laterally by short line, 4th and th seggment incompletely separated. - Abdomen 4-segmented. - Rostrum small without filaments. - Posterolateral margin of 5th thoracic segment angular. A1 reaching end of cephalothorax, segments 8 and 9 fused. - Exopod of A2 twice the length of endopod. - Basal segment of Md palp with 3 setae ; conspicuous hump on external side of Gnathobase ; teeth on chewing edge small. - Mx1 with 1st inner lobe bearing 10 spines, 2nd and 3rd inner lobes and 2nd basal segment each with 2 setae , 2 and 5 setae on endopod, 4 setae on exopod. - Mx2 1st lobe with 4 setae, 2nd to 4th lobes each with 3 setae, 5th lobe with 3 setae, 1 small spine and 1 sensory appendage ; endopod with 2 types of sensory appendages. - Endopod of P1 1-segmented, of P2 2-segmented, of P3 to P4 3-segmented ; exopods of all four legs 3-segmented. In P2 to P4 posterior sides of endopods armed with spinules, in P4 also basipod and exopod. - P5 3-segmented, on posterior side, mainly externally, covered with small spines. Terminal segment with 1 small external spine, 1 long internal spine and 2 terminal points, not articulating with the segment.
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 Issued from : G.D. Grice & K. Hülsemann in Bull. Mus. Comp. Zool., Harvard, 1970, 139 (4). [p.210-211, Pl. VII, Figs. 117-127]. As Xanthocalanus macrocephalon. Female: 117, A2; 118, Md palp; 119, Md (masticatory edge); 120, Mx1; 121, Mx2; 122, Mxp; 123, P1; 124, P2; 125, P3; 126, P4; 127, P5.
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Carte de distribution de Byrathis macrocephalon par zones géographiques
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| | | | Loc: | | | NW Atlant. (off Woods Hole).
Type locality: 39°45.2' N, 70°33.8' W. | | | | N: | 1 | | | | Lg.: | | | (200) F: 1,12-1,06; {F: 1,06-1,12} | | | | Rem.: | For Markhaseva & Ferrari (2005, p .141) this species can be distinguished from B. volcani by the size ; 3 setae on basis of Md (2 setae in B. volcani) ; distal to anterior knob of Vaupel Klein’s organ of P1 bears denticles (without denticles on B. volcani) ; and distinguished from B. laurenae by the symmetrical genital complex (slightly asymmetrical in B. laurenae ; 8-segmented exopod of A2 (7-segmented for B. laurenae) and elongate segment with 3 setae (4 setae for B. laurenae.
According to Schulz (2006, p.67) Xanthocalanus laptevorum should be incorporated within Byrathis particularly on account of characters of A2, Md, Mxp, P1 and P5. | | | Dernière mise à jour : 28/03/2016 | |
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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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