Species Card of Copepod
Calanoida ( Order )
    Calanoidea ( Superfamily )
        Megacalanidae ( Family )
            Bathycalanus ( Genus )
Bathycalanus eximius  Markhaseva, 1983   (F)
Ref.:
Markhaseva, 1983 (in Brodsky & al., 1983, p.197, Descr.F, figs.,F); Bradford-Grieve & al., 2017 (p.129, Descr F, Rem.)
Species Bathycalanus eximius - Plate 1 of morphological figuresissued from : K.A. Brodsky, N. V. Vyshkvartzeva, M.S. Kos & E.L. Markhaseva in Opred. Faune SSSR, 1983, 135 (1). [p.196, Fig.87].
Female: habitus (dorsal and lateral, respectively); R, forehead and rostrum; Mx2; Gn, genital segment (dorsal, lateral and ventral: respectively Gn1, Gn2 and Gn3.
Nota: Genital segment barrel-like.

Complement from Bradford-Grieve & al. (2017, p.129):
- Forehead, in dorsal view, with low prpjection bearing pair of small spine-like processes.
- In lateral view, posterior corners of pediger 5 symmetrical, rounded, but slightly pointed in dorsal view.
- Genital double-somite markedly swollen and symmetrical in dorsal view, wider than long, with lateral surfaces ornamented with large spinules.
- A1 extending beyond caudal rami by 4-6 segments; anterior and posterior borders of ancestral segments XVI-XXI smooth.


Species Bathycalanus eximius - Plate 2 of morphological figuresissued from : K.A. Brodsky, N. V. Vyshkvartzeva, M.S. Kos & E.L. Markhaseva in Opred. Faune SSSR, 1983, 135 (1). [p.197, Fig.87 (continuation)].
Female.
Pmd = mandibular palp; Md = mandibular blade (gnathobase).

Complement from Bradford-Grieve & al. (2017, p.129):
- A2 exopod ancestral segment III with small seta and segment IV with short seta extending beyond segment VIII, no sign of setae on ancestral segments I and II.
- Mx1 praecoxal arthrite with 14 setae including 3 on posterior surface and 1 longer and 1 smaller on anterior surface; coxal endite without setae; basal endites 1 and 2 with 2 and 4/5 setae, respectibvely; endopod segments with 2, 2, 5+1 small anterior surface seta; basal exite with 1 seta, epipodite with 7 long and 2 short, reduced setae.
- Mxp syncoxa endite 4 longest seta extending beyond distal border of endopod segment 2; endopod segments 2-6 with 4 (including 3 small), 3 (including 2 small), 3 (including 2 small) + 1, 4 setae (2 large and 2 very small of which 1 on outer border), respectively.
- P1 exopodal segment 3 with 1 outer border spine.


Species Bathycalanus eximius - Plate 3 of morphological figuresIssued 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 very swollen in dorsal view, decorated with spinules. (male unknown).

NZ: 1

Distribution map of Bathycalanus eximius by geographical zones
Species Bathycalanus eximius - Distribution map 2Issued 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:
N Pacifique (Kurile-Kamchatka Trench).
N: 1
Lg.:
(131) F: 11,9; {F: 11,90}
Rem.: Abyssal.
For Bradford-Grieve & al; (2017, p.129) this species is distinguished from all other Bathycalanus: 1- A very swollen genital double-somite bearing lateral spinules; 2- second basal endite of Mx1 with 4 setae.
Last update : 08/08/2018
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed September 22, 2021]

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