Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Diaptomoidea ( Superfamille )
        Acartiidae ( Famille )
            Acartia ( Genre )
                Odontacartia ( Sous-Genre )
Acartia (Odontacartia) nadiensis  Lee S, Soh & Lee W, 2019   (F,M)
Ref.:
Lee S. & al., 2019 (p.71 (p.71, Descr. F, M, figs.F, M, phylogeny, , Table 3: comparison between species of the subgenus Odontacartia, species key of the Odontacartia).
Espèce Acartia (Odontacartia) nadiensis - Planche 1 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.73, Fig.1];
Female (from Nadi Bay, Fiji): A-B, habitus (dorsal and lateral); C, urosome (ventral.
Scale bars in µm.

Nota:
- Prosome/Urosome length ratio = 3.5 : 2.1.
- Prosome 5-segmented.
Head and 1st pediger completely separate, 4th and 5th pedigers fused.
- Posterior corners of 5th pediger somite rounded, each with 3 spines.
- Rostral filaments thick and short.
- Urosome 3-segmented.
- Genital double-somite slightly swollen anterolaterally, with paired of gonopores ventromedially, each covered with pointed operculum.
- 1st and 2nd urosomites each with 4 spines on posterodorsal margin.
- Caudal rami bearing short hairs on lateral margin.
- Proportional lengths of urosomites and caudal rami 38 : 23 : 17 : 22 = 100.


Espèce Acartia (Odontacartia) nadiensis - Planche 2 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.74, Fig.2];
Female: A, rostrum and A1 (part., 1st to 8th segment); B, A1 (part., 8th to 18th segment); C, A2; D, P5.
Scale bars in µm.

Nota;
- A1 incompletely 18-segmented, 4th to 7th segments partly fused on dorsal surface, 9th to 11th each with 1 row of setules, 12th segment with 3 rows of sdetules, 13th and 17th segments each with 1 row of setules.
- A2 coxa with 1 seta; basis and 1st endopod segment fused to form elongated allobasis bearing 8 setae medially and 1 seta terminally along inner margon, and spinular row on distal arca; 2nd endopod segment elonjgated, with 7 setae, row of spinules o,n lateral margin:; 3rd exopod segment short, with 7 setae. Exopod 4-segmented (setation formula 1, 2, 2, 3).
- P5 symmetrical, 3-segmented; basis ovate, with outer seta; exopod tapering, thick, bent at midlength, distal portion with minutely serrated terminal spine , base slightly swollen.


Espèce Acartia (Odontacartia) nadiensis - Planche 3 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.75, Fig.3];
Female: A, Md; B, Mx1; C, Mx2; D, Mxp.
Scale bar in µm.

Nota:
- Md: Coxa with well developed gnathobase bearing 11 teeth; basis with seta and row of setules on lateral and posterior margins; endopod 2-segmented, 1st segment with 2 setae, 2nd segment with 7 setae: exopod 5-segmented (setation formula 1, 1, 1, 1, 2).
- Mx1 precoxa and coxa incompletely fused, precoxal arthrite with 8 setae; coxal endite with 3 setae: 1 short seta and 8 long setae on coxal epipodite; basal endite with 1 seta; basal exite with 1 seta; 1-segmetd exopod with 2 setae laterally and 8 setae terminally; endopod absent.
- Mx2 precoxa and coxa incompletely fused; setation formula of endites 4, 2, 2, 3; basal endite with 1 seta and row of spinules on distal margin; endopod 3-segmented (setation formula 2, 2, 3).
- Mxp comprisind syncoxa with 6 setae; basis with spiniform seta; endopod 2-segmented, 1st segment with 3 setae, 2nd segment with 2 setae.


Espèce Acartia (Odontacartia) nadiensis - Planche 4 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.77, Fig.4];
Female: A, P1; B, P2; C, P3; D, P4.
Scale bar in µm.


Espèce Acartia (Odontacartia) nadiensis - Planche 5 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.80, Fig.7];
Female (Scanning electron micrographs): A, rostrum (ventral view); B, P5; C, P5 terminal spine; D, genital double-somite (ventral view); E, genital field; F, genital double-somite (dorsal view).


Espèce Acartia (Odontacartia) nadiensis - Planche 6 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.76];
Female & male : Spine and setal formulae for P1 to P4.
Roman numerals: spines; Arabic numerals: setae.


Espèce Acartia (Odontacartia) nadiensis - Planche 7 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.78, Fig.5];
Male: A-B, habitus (dorsal and lateral); C, P5.
Scale bars in µm.

Nota:
- Body surface armed with some sensilla.
- Prosome/Urosome length ratio 3.1 : 2.1.
- Prosome 5-segmented.
- Rostral filaments thin.
- 5th prosomite with 6 spines on posterior margin.
- Urosome 5-segmented.
- 2nd urosomite with 4 spines on posterodorsal margin and 2 spines on posteroventral margin; pair of sensillae on dorsal surface; 3rd and 4th urosomites each with 4 spines on posterodorsal margin.
- Caudal rami bearing short hairs on lateral margin.
- Length proportions of urosomites to caudal rami 16 : 31 : 21 : 7 : 12 : 14 = 100.
- P5 asymmetrical, intercoxal sclerite distinct. Left leg 4-segmented; basis armed with posterolateral seta and rounded lobe on posterior surface; exopod 2-segmented, 1st segment unarmed, 2nd segment with hairs and 1 spine with teeth on medial margin and 1 small spine distally. Right leg 5-segmented, basis armed with posterolateral seta; exopod 3-segmented, 1st segment with long slender seta, 2nd segment with oblong inner lobe bearing 1 spine on distal margin, 3rd segment with 1 spine on medial margin and 1 spine distally.


Espèce Acartia (Odontacartia) nadiensis - Planche 8 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.79, Fig.6];
Male: A, left A1; B, right A1; C-D, urosome (dorsal and ventral, respectively).
Scale bars in µm.

Nota:
- Left A1 22-segmented;. Right A1 18-segmented, with geniculation (14th and 15th segments).
- Other mouthparts and P1-P4 as in female.


Espèce Acartia (Odontacartia) nadiensis - Planche 9 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.81, Fig.8];
Male: (Scanning electron micrographs): B, rostrum (ventral view); G, 5th urosomite and caudal rami (dorsal view); H, same (ventral view).


Espèce Acartia (Odontacartia) nadiensis - Planche 10 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.84, Table 3]. Issued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.84, Table 3].
Acartia (Odontacartia) nadiensis: Morphological characters.
Compare with other Odontacartia species.

Nota:
1 - Absence of spine on 1st to 2nd segments of female A1 .....2.
2 - Spine present on dorsal surface of female genital double-somite ..... 3.
3 - Four strong spines on dorsal surface of female genital double-somite and 2nd urosomite.


Espèce Acartia (Odontacartia) nadiensis - Planche 11 de figures morphologiquesIssued from : S. Lee, H.Y. Soh & W. Lee in ZooKeys, 2019, 893. [p.82, Fig.9]
Ohylogenetic tree based on mtCOI sequences (58 bp) of Odontacartia species including A. (Acartiura) omorii as outgroup.
One-thousand bootstrap replicates were performed by MEGA6 using neighbor joining and minimum evolution methods. Neighbor joining bootstrap values shown above branches; minimum evolution bootstrap values are below branches.

NZ: 1

Carte de distribution de Acartia (Odontacartia) nadiensis par zones géographiques
Loc:
SW Pacif. (Nadi Bay, Fiji)
Type locality: 17°45.848' S, 177°22.348' E.
N: 1
Lg.:
(1243) F: 0,975-1,050; M: 0,910-0,952; {F: 0,975-1,050; M: 0,910-0,952}
Rem.: For Lee & al. (2019, p.82) the subgenus Odontacartia, including the new species, can be divided into 2 groups based on the presence or no of a spine on the 1st segment of A1. A. nadiensis lacks a spine on this segment, second, the outer seta of the female P5 is much shorter than the terminal spine, and the length ratio of the outer seta/ terminal spine is 0.4. The male P5 is clearly distinguishable from the rest of species based on its length and the type of medial process on the exopodal segment 2 of the left leg.; furthermore, the new species shows other minor differences compared to the other 13 Odontacartia species, such as the number of dorsal spines on the urosomite, the length/width ratio of the female P5 basis, and the length/width ratio of caudal rami. To supplement the morphological evidences, molecular analysis (using partial mtCOI sequences) of six Odontacartia species showed that A. nadiensis differed by 24.1-29.0% from the sequences of congeneric species, which is greater tha the range of interspecific differences reported in previous studies.
Dernière mise à jour : 09/03/2020

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2021. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 02 décembre 2021]

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