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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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Stephidae ( Famille ) |
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Stephos ( Genre ) |
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Stephos projectus Moon, Youn & Venmathi Maran, 2015 (F,M) | |
| | | | | | | Ref.: | | | S.Y. Moon & al., 2015 (p.31, Descr.F, M, figs.F, M, Rem.) |  Issued from : S.Y. Moon, S.-H. Youn & B.A. Venmathi Maran in ZooKeys, 2015, 495. [p.30, Fig.5]. Female (34°29'13''N, 127°29'12''E): A-B, habitus (dorsal) with spermatophore; B, habitus (lateral); C, 5th pedigerous somite and urosome (dorsal); D, urosome (lateral); E, genital double-somite (ventral); F, 2nd urosomal somite to caudal rami (ventral). Scale bars: 200 µm (A, B); 100 µm (C, D); 50 µm (E, F). Prosome-urosome ratio 1.83: 1. - Length ratio of urosomites as 51.1 : 18.9 : 17.3 : 12.7 = 100. - Caudal rami with 6 setae, symmetrical, about 1.63 times longer than wide, with 4 transverse rows of spinules on ventral surface; caudal seta I lacking; seta II reduced; seta VII displaced to medial margin.
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 Issued from : S.Y. Moon, S.-H. Youn & B.A. Venmathi Maran in ZooKeys, 2015, 495. [p.34, Fig.6]. Female: A, A1; B, A2; C, Md; D, Mx1; E, Mx2; F, Mxp. Scale bars: 50 µm. Nota: A1 similar to S. geojinensis except for not extending beyond distal margin of 5th pedigerous somite. - A2 similar to S. geojinensis except for presence of 2 transverse rows of spinules (instead of tiny serrated process plus spinule) on lateral margin of distal segment of endopod. - Md similar to S. geojinensis except for: 1- coxal gnathobase with straight row of moderately incised teeth; 2- outer margin of proximal segment of exopod with row of setules; 3- distal segment of endopod with transverse row of spinules. - Mx1 and Mx2 similar to S. geojinensis except for presence of 1 additional seta on basal endite of Mx2. - Mxp differing from S. geojinensis in presence of additional rows of tiny spinules on syncoxa.
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 Issued from : S.Y. Moon, S.-H. Youn & B.A. Venmathi Maran in ZooKeys, 2015, 495. [p.35, Fig.7]. Female: A, P1; B, P2; C, P3; D, P4; E, P5. Scale bars: 50 µm. Nota: P1 to P4 with armature formula as in S. geojinensis but with outer spine on 2nd exopodal segment of P1 transformed into seta. P5 symmetrical, uniramous, 3-segmented with proximal segment fused to intercoxal sclerite; 2nd segment similar to S. geojinensis but shorter (1.72 times longer than wide); distal segment with 1 seta instead of spine on lateral margin, and with spinulation on terminal spine not so coarse.
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 Issued from : S.Y. Moon, S.-H. Youn & B.A. Venmathi Maran in ZooKeys, 2015, 495. [p.36, Fig.8]. Male: A-B, habitus (dorsal and lateral, respectively); C, A1; D-E, P5 (different views) Nota: Prosome-urosome ratio 1.87:1. - Length ratio of urosomites as 23.7 : 25.6 : 22.6 : 18.6 : 9.5 = 1000. -Caudal rami similar to those of female. A1 similar to S. geojinensis escept for not extending beyond distal margin of 5th pedigerous somite and for failure to express 1 aesthetasc on ancestral segments VI, VIII, composite X-XI, XX. In addition, the composite segment I-II displays 4 setae (vs. 3 in S. geojinensis). - A2, Md, Mx1, Mx2, Mxp and P1 to P4 similar to female. - P5 strongly asymmetrical, uniramous and filiform. Left leg 5-segmented; segments 3 and 4 each with rounded outgrowth on medial margin, outgrowth on segment 3 more slender and crowned with hyaline frill, that on segment 4 with ridged plate terminally; 4th segment with additional short conical outgrowth and longituninal row of spinules; distal segment short, rounded, with 4 long hyaline lamellae on distal margin and patch of short spinumles on posterior surface. Right leg 4-segmented; segment 3 elongate, straight and slender except for blunt triangular process proximally on lateral margin; 4th segment sickle-shaped with rouned tip; 4 rounded outgrowths along inner margin and single outgrowth suntermonally on outer margin of segment.
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Carte de distribution de Stephos projectus par zones géographiques
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| | | | | | | Loc: | | | S Korea (Bongyoungri, Naro Island).
Type locality: ± 34°29'13'N, 127°29'12''E.
Nota from Brylinski & Courcot (2019, p.10): Collected in the stagnant water flooding the burrows excavated by ocypodid crabs. | | | | N: | 1 | | | | Lg.: | | | (1179) F: 1,47-1,61; M: 0,86-0,96; {F: 1,47-1,61; M: 0,86-0,96} | | | | Rem.: | For S.Y. Moon & al. (2015, p.33) the species falls within the ''group III'' (after Bradford-Grieve, 1999 a), characterized by a 4-segmented right male P5 combined with a left leg in which the 4th segment is swollen.
S. projectus and S. geojinensis are easily differentiated based on the ornamentation of both the female genital double-somite and genital operculum; the morphology of the distal segment of the male right P5; the presence/absence of a tiny pointed process on the distomedial angle of 2nd segment of female P5; and the condition (seta or spine) of the lateral armature element on distal segment of female P5, among other features.
Among the species belonging to ''group III'' , only two of them, S. hastatus and S. robustus, share with S. projectus an asymmetrical female genital double-somite. | | | Dernière mise à jour : 29/04/2019 | |
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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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