Fiche d'espèce de Copépode
Cyclopoida ( Ordre )
    Corycaeidae ( Famille )
        Farranula ( Genre )
Farranula orbisa  Wi & Soh, 2013   (F,M)
Syn.: Corycaeus (Corycella) curtus M. Dahl, 1912, Taf.XIV, figs. 26-28; Taf. XV, figs.19, 20, 28.
Corycaeus (Corycella) rostratus : Chen & al., 1974, Pl.22, figs.1-6.
Wi & Soh, 2013 (p.1814, Descr.F, M; figs.F,M, Rem.: Table 1)
Espèce Farranula orbisa - Planche 1 de figures morphologiquesIssued from : J.H. Wi & H.Y. Soh in J. Mar. Biol. Ass. U.K., 2013, 93 (7). [p.1815, Fig.2].
Female (from 126°56.36'N, 33°16.40'E): A-B, habitus (dorsal and lateral, respectively); C, urosome (lateral; arrow indicating ventral ornamentation on 2nd urosomal somite); D, A1; E, A2 (ventral view).
Scale bars in µm.

Nota : Prosome 2-segmented ; about 2.4 times as long as urosome including caudal rami, 3.4 times as long as urosome excluding caudal rami.
Cephalosome completely fused with 1st pedigerous somite, with ventral process, 1.4 times longer than width at base (marked in fig.3 E), 2nd to 4th pedigerous somites forming single compound somite with suture line between 2nd and 3rd pedigerous somites ; 3rd pedigerous somite dorsally covering 4th pedigerous somite, forming inverted triangular shape ; 4th pedigerous somite with extended and pointed posterolateral corners, reaching to 2/3 distance of 2nd urosomal somite, with small protrusions on inner distal margin (arrowed in fig.2A). ).
Frontal part rounded, with 2 large separate cuticular lenses.
Urosome 2-segmented ; proportional lengths (%) of urosomites and caudal rami 7.1 : 66 : 26.9.
1st urosomal somite bearing P5 ventrolaterally (fig.2C), genital double-somite and anal somite combined as 2nd urosomal somite.
2nd urosomal somite (fig.2A-C) distinctly rounded from anterior to mid-region, about twice longer than maximum width at anterior third region, anteroventral margin with patch of minute spinules (indicated by arrow in fig.2C), just rounded without round hump-like projection in lateral view, posteroventral and lateral margiin fringed with minute spinules, posterior margin finely serrated ventrolaterally (fig.2C), dorsoposterior surface almost bearing mucilaginous trace of spermatophore around genital opening (arrowed in fig.2C).
Genital area located dorsolaterally, paired genital apertures approximately 1/3 distance from anterior margin of dorsal surface, hidden behind opercula.
Caudal rami cylindrical, about ¾ of 2nd urosomal somite, 3.3 times longer than wide at base ; each ramus armed with 4 setae : slender anterolateral seta II, outer posterolateral seta III short, spiniform, and serrated along medial margin, inner terminal seta IV longest, and dorsal seta V 2.3 longer than outer seta III and 1.3 times shorter than seta IV.
A1 4-segmented. Proportional lengths (%) of segments measured along posterior non setiferous margin 22.6 : 14.5 : 11.3 : 25.8 : 14.5 : 11.3.
A2 4-segmented, with coxa and basis fused fused and 3 endopodal segments : coxobasis 2.5 times longer than wide, with strong bipinnate seta inner distal margin ; endopod 3-segmented : unequal in length, 1st endopodal segment robust and longest among endopodal segments, about 2.9 times as long as wide at base, bearing bipinnate seta on inner proximal margin, much shorter than coxobasal seta, inner distal margin roughly serrated from 2/3 of margin, with long curved spinous process at ¾ of serrated part, outer lateral margin ornamented row of denticles, naked seta on distolateral margin ; 2nd endopodal segment shortest, bearing 3 elements : curved stout spine arising from outer distal margin, with lateral branch ; slender, pinnate spine located near its base and reaching almot middle of distal spine ; short curved spine arising from inner margin, outer distal spine 1.8 times longer than its branched soine ; 3rd endopodal segment cylindrical, as long as wide and armed with 3 elements : 1 stout terminal spine, short spine arising from inner margin, strong seta on the outer margin, and terminal spine 1.2 times shorter than outer spine on 2nd endopodal segment. Length ratio of terminal spine to outer spine on 3rd exopodal segment 1.5 : 1.
P5 consisting of 2 unequal simple setae located ventrolaterally (fig.2C).
P6 represented by operculum closing off each genital aperture (fig.2A)

Espèce Farranula orbisa - Planche 2 de figures morphologiquesIssued from : J.H. Wi & H.Y. Soh in J. Mar. Biol. Ass. U.K., 2013, 93 (7). [p.1816, Fig.3].
Female: A, Md (dorsal view); B, Mx1 (individual elements designated using uppercase letters); C, Mx2 (lateral view); D, Mxp; E, ventral cephalothorax process; F, P1; G, P2 (arrow indicating vestigial coxal seta); H, P3; I, P4.
Scale bars in µm.

Nota: Md with 2 elements on gnathobase: 1 spine and 1 blade; spine broad and robust, with 2 naked slender setae on medial area and 1 basal seta; blade forming spinous processes, surrounded by patch of spinules around base.
Mx1 reduced, praecoxal arthrite bearing 4 articulated spinous elements: innermost one (A) at some distance from other elements and distal margin serrated, almost equal in length of element B, element B stout, distal margin with spinous process, twice longer than element C, distal margin of element C serrated and element D shortest.
Mx2 2-segmented, allobasis shorter than syncoxa: syncoxa unarmed; allobasis produced distally into strong spine, with 4 naked setae proximally, i,nner margin bearing 3 spines of different lengths: medial one naked, ventral one split into 2 branches (arrowed in fig.3C), and dorsal one longest, unipinnate innermost spine.
Mxp 3-segmented: syncoxa unarmed; basis robust and expanded, with 2 elements along inner margin : proximal one short, located at base of distal one with 2 spinules along inner margin, located at 2/3 distance of inner margin, 3.3 times longer than proximal one, 2.3 times shorter than basis, endopodal segment drawn out into long curved claw, unornamented and almost equal to length of basis, accessory armature consisting of slender long, unipinnate seta on inner proximal margin, and short unipectinate spine laterally on outer proximal margin of claw.

Espèce Farranula orbisa - Planche 3 de figures morphologiquesIssued from : J.H. Wi & H.Y. Soh in J. Mar. Biol. Ass. U.K., 2013, 93 (7). [p.1818].
Female: Armature formula of swimming legs P1 to P4.
Roman numerals = spines; Arabic numerals : setae.

Espèce Farranula orbisa - Planche 4 de figures morphologiquesIssued from : J.H. Wi & H.Y. Soh in J. Mar. Biol. Ass. U.K., 2013, 93 (7). [p.1817, Fig.4].
Male: A-B, habitus (dorsal and lateral, respectively); C, P5; D, P6 (left side); E, A1.
Scale bars in µm

Espèce Farranula orbisa - Planche 5 de figures morphologiquesIssued from : J.H. Wi & H.Y. Soh in J. Mar. Biol. Ass. U.K., 2013, 93 (7). [p.1818, Fig.5].
Male: A, A2 (ventral view); B, Mxp; C, exopodal segment 3; E, exopodal segment 3; F, basis and exopod of P4.
Scale bars in µm.

Espèce Farranula orbisa - Planche 6 de figures morphologiquesIssued from : J.H. Wi & H.Y. Soh in J. Mar. Biol. Ass. U.K., 2013, 93 (7). [p.1819, Table 1].
Comparison of respective proportion for each segment and width among four species of Farranula.

Nota: A= absent; P = present.

NZ: 1

Carte de distribution de Farranula orbisa par zones géographiques
Yellow Sea (Jeju Is., S Korea)
N: 3
(1154)* F: 0,705-0,735; M: 0,681-0,704; {F: 0,705-0,735; M: 0,681-0,704}
*: Total boduy length in lateral view.
Dernière mise à jour : 05/02/2015

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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 [Accédé le 22 février 2024]

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