Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Calanoidea ( Superfamille )
        Megacalanidae ( Famille )
            Bathycalanus ( Genre )
Bathycalanus dentatus  Bradford-Grieve, Blanco-Bercial & Boxshall, 2017   (F,M)
Ref.:
Bradford-Grieve, Blanco-Bercial & Boxshall, 2017 (p. 92, Descr. F, M, figs. F, M, phylogeny)
Espèce Bathycalanus dentatus - Planche 1 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.93, Fig.52].
Female (from 38.033°N, 124.183°W): A-B , habitus (dorsal and lateral , respectively; C, forehead (lateral); D, same (dorsal); E, P1 (anterior view); F, Mxp.
Scale bars: 1.0 mm on all figures

Nota:
- Forehead in lateral view with curved hump just posterior to rostral projection, in dorsal view produced into distinct rounded projection bearing pair of very small rounded processes.
- Pediger 5 with short, rounded posterior lappets, extending 1/4 of way along genital double-somite.
- Genital double-somite with slight anterolateral bulge in dorsal view at anterior 1/3, length about 1.1 times maximum width.
- A1 extending 5-6 segments beyond caudal rami.
- Mxp syncoxal endite 4 [syncoxa = double segment derived from fusion of praecoxa and coxa] with longest spinulose seta extending to distal border of endopodal segment 1.
- P1 exopd with articulation between exopodal segments 2 and 3 well developed.
- Maculae cribrosae present on anterior surfaces of basis and exopodal segments 1-3 of P2-P4 and basis and exopodal segment 3 of P1


Espèce Bathycalanus dentatus - Planche 2 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.94, Fig.53].
Female: A, A1 ancestral segments I-XII; B, same, segments XIII-XVII; C, same, segments XVIII-XX; D, same, segments XXI-XXIV; E, same, segmentsXXV; F, same, segments XXVI-XXVIII; G, detail of ancestral segments XXVIII.
Scale bars 1.0 mm (A-F); 0.1 mm on remaining figure.

Nota:
- Distoanterior and borders of segments XVI-XXI with about 6, 13, 13, 13, 7 (some may be broken off), 13 unevenly spaced teeth, respectively, lining slight excavation just distal to seta; all teeth slightly on ventral surface; posterior borders of these segments smooth.


Espèce Bathycalanus dentatus - Planche 3 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.95, Fig.54].
Female: A, A2 minus terminal endopod segment; B, terminal endopod segment; C, Md palp; D, Md gnathobase; E, Mx1; F, Mx2.
Scale bars: 1.0 mm (F); 0.1 mm on remaining figures.

Nota:
- A2 exopod segment IV with short seta extending slightly beyond distal border of segment VIII, lined with spinules.
- Mx1 praecoxal arthrite with 13 setae and spines, including 2 setae on posterior surface, 1 distoanterior seta small; coxal endite without setae; basal endite 2 with 2 short setae; endopod segments with 2 (subequal), 2 (subequal), 6 setae (including 1 smaller seta arising from posterior surface), respectively.


Espèce Bathycalanus dentatus - Planche 4 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.96, Fig.55].
Female: A, P2 (posterior view); B, P3 (anterior view); C, P4 (anterior view); D, P5 (anterior view).
Scale bar; 1.0 mm on all figures.


Espèce Bathycalanus dentatus - Planche 5 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.97, Fig.56].
Male (from 38.033°N, 124.183°W): A-B , habitus (dorsazl and lateral, respectivelyà; C, forehead (dorsazl); D, anterior head (lateral) ; E, caudal ramus (dorsal); F, endopod of Md; G, basal endite 2 and endopod of Mx1.
Scale bars: 1.0 mm (A, B, G); 0.1 mm on remaining figures.

Nota:
- Pediger 5 with short rounded lappets not reaching posterior border of urosomite 1.
- Urosomite II 1.58 times longer than urosomite III and in lateral view and not constricted anteriorly such that ratio UrII ant/UrII max = 0.73.
- Right A1 gripping elements aroud geniculation very similar to those of Ba. richardi.


Espèce Bathycalanus dentatus - Planche 6 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.98, Fig.57].
Male: A, left A1 ancestral segments I-XII; B, same, segments XIII-XVI; C, same, segments XVII-XIX; D, same, segments XX-XXIV; E, same, segments XXV-XXVIII.
Scale bar: 1.0 mm on all figures.


Espèce Bathycalanus dentatus - Planche 7 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.99, Fig.58].
Male: A, right A1 ancestral segments I-XI; B, same, segments XII-XV; C, same, segments XVI-XX; D, same, segments XXI-XXVIII; E, detail of ancestral segments XXI-XXIII ; F, detail of ancestral segments XXVIII.
Scale bar: 1.0 mm (A-D; 0.1 mm on remaining figures.


Espèce Bathycalanus dentatus - Planche 8 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.100, Fig.59].
Male: A, P1 (anterior view); B, exopod segment 3 of P1 (other side); C, right P5 (posterior view); D, left P5 (posterior view); E, inner distal corner of left P5 exopod segment 2.
Scale bars: 1.0 mm (A-D); 0.1 mm on remaining figures.

Nota:
- P5 left exopodal segment 2 specialised seta with long lash extending well beyond distal border of endiopodal segment 3 and densely covered in long setules, basal part elongate; inner border of right exopodal segment 3 lined with patches of setules, proximal part of border naked.


Espèce Bathycalanus dentatus - Planche 9 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.91, Table 10].
Morphological characters after identification key of Bathycalanus females and males.
Compare to other species of genus.

Main characters identification after species key :
1 - Mx1 praecoxal endite without setae.
2 - Anterior margin of head with 2 very small spine-like processes.
3 - P1 exopod segments 2 and 3 separate;
4 - Pedigerous somites 4 and 5 without laterally extended lappets; Genital double not angular shaped.
5 - Genital double-somite hardly swollen in dorsal view, without spinules. (male unknown).
6 - Pedigerous somite 5 hardly extended posteriorly, symmetrical, short and rounded in lateral view.
7 - Female A1 anterodistal borders of ancestral segments XVI-XXI with teeth, posterior borders smooth. Male left P5 exopod segment 2 specialised seta very long, extended beyond distal border of endopod, right P5 exopod segment 3 inner border setulose.


Espèce Bathycalanus dentatus - Planche 10 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.82, Table 9].
Proportions of male urosomites. See below diagram illustrating how measurements were made (Fig.1, D).
Stations: MV66-11 = 38.033°N, 124.183°W.


Espèce Bathycalanus dentatus - Planche 11 de figures morphologiquesIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.13, Table 1, D].
Diagram illustrating measurements. Example taken for Bathycalanus bradyi in lateral view.. male. Ur = urosomite

NZ: 5

Carte de distribution de Bathycalanus dentatus par zones géographiques
Espèce Bathycalanus dentatus - Carte de distribution 3Issued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.84, Fig.46].
Distribution of Bathycalanus species;
Bathycalanus richardi (filled squareç; Bathycalanus bradyi (filled triangle); Bathycalanus milleri (open triangle); Bathycalanus dentatus (open square); Bathycalanus tumidus (open circle); Bathycalanus adornatus (open diamond); Bathycalanus pustulosus (filled star); Bathycalanus unicornis ( (filled diamond); Bathycalanus bucklinae (filled circle); Bathycalanus eximius (cross).
Loc:
North-eastern Pacific, South of Japan, South-eastern Pacific, off California.

Type locality : 38.133° N, 124.183° W.
N: 1
Lg.:
(1316) F: 11,1-13,40; M: 11,80; {F: 11,1-13,40; M: 11,80}
Rem.: Upper abyssopelagic species in hauls 1900-0 m and 3889-0 m.
For Bradford-Grieve & al; (2017, p.95) this species closely related to Bathycalanus richardi and Bathycalanus bradyi in that it also has a pair of small spine-like processes on forehead. Females of this species have possibly been identified as Bathycalanus bradyi in the past. The male has been assigned to Bathycalanus dentatus mainly on the basis of its large size and that it had only 2 setae on the 2nd basal endite of the mx1.. Nevertheless, a final conclision probably has yo await ganetic analysis because the left A1 does not carry the teeth characteristic of the female.
Dernière mise à jour : 01/08/2018

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2020. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 05 décembre 2020]

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