Species Card of Copepod
Calanoida ( Order )
    Calanoidea ( Superfamily )
        Megacalanidae ( Family )
            Bathycalanus ( Genus )
Bathycalanus tumidus  Bradford-Grieve, Blanco-Bercial & Boxshall, 2017   (F)
Ref.:
Bradford-Grieve, Blanco-Bercial & Boxshall, 2017 (p. 108, Descr. F, figs. F, phylogeny)
Species Bathycalanus tumidus - Plate 1 of morphological figuresIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.109, Fig.67].
Female (from 29.533°N, 137.233°E): A, habitus (dorsal); B, forehead (dorsal view); C, anterior head (lateral); D, urosome (dorsal); ; E, genital double-somite (lateral); F, A1; G, P1 (posterior view).
Scale bars: 1.0 mm on all figure

Nota;
- Forehead in dorsal view produced into distinct short rounded projection located dorsal to base of rostrum and bearing pair of small stout divergent spine-like processes.
- In lateral view , Posterolateral corners of pediger 5 symmetrical, rounded.
- Genital double-somite bulbous, symmetrical in dorsal view, slightly wider than long, widest width at approximately midlength, with small anteroventral genital operculum, seminal receptacles not observed.
- A1 26-segmented (ancestral segments II-IV fused and X-XI partly separate).
- P1 exopod with articulation between exopodal segments 2 and 3 well-developed.


Species Bathycalanus tumidus - Plate 2 of morphological figuresIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.110, Fig.68].
Female A1 ancestral segments: A, segments I-XIV; B, segments XV-XVIII; C, segments XIX-XXII; D, segments XXIII-XXVI; E, segments XVII-XXVIII; F, detail of segment XXVIII.
Scale bars: 1.0 mm (A-E); 0.1 mm (F).

Nota:
- Anterior and posterior borders of ancestral segments XVI-XXI smooth.


Species Bathycalanus tumidus - Plate 3 of morphological figuresIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.111, Fig.69].
Female: A, A2; B, Md palp; C, Mx1; D, Mx2; E, Mxp.
Scale bars: 1.0 mm (D, E); 0.1 mm (A, C, B).

Nota:
- A2 exopod segment IV with short seta extending beyond distal border of segment VIII and bearing short setules.
- Mx1 praecoxal arthrite with 15 setae incuding 4 on posterior surface and 2 small anterior surface setae; coxal endite with 1 seta; basal endites 1 and 2 with 2 and 4 setae, respectively; basis and endopod segments 1 and 2 fused although demarcation between segments visible, segment 3 dseparate; endopodal segments with 2 §subequal), 2 (subequal), 5+1 smaller anterior surface seta.
- Mxp syncoxal endite 4 with large toothed seta extending half way along endopodal segment 2.


Species Bathycalanus tumidus - Plate 4 of morphological figuresIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.112, Fig.70].
Female: A, P2 (anterior view); B, P3 (anterior view); C, P4 (anterior view); D, P5 (posterior view).
Scale bar = 1.0 mm on all figures.


Species Bathycalanus tumidus - Plate 5 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 coxal endite with 1 seta.
2 - Mx1 praecoxal arthrite with 4 posterior surface setae; basal endite 2 with 4 setae (male unknown).

NZ: 4

Distribution map of Bathycalanus tumidus by geographical zones
Species Bathycalanus tumidus - 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:
Eastern and Western North Pacific and the Atlantic off West Africa near the Cape Verde Islands.

Type locality: 29.5333° N, 137.233° E.
N: 1
Lg.:
(1316) F: 9,3-10,90; {F: 9,30-10,90}
Rem.: Abyssopelagic species 2000-3000 m.
For Bradford -Grieve & al; (2017, p.108) the species is very like Bathycalanus richardi except the genital double-somite is of a bulbous shape in dorsal view, widest at midlength and wider than long; Mx1 praecoxal arthrite has 4 posterior surface setae, unnlike any other species of Bathycalanus.
After the authors cited, the genetic distance data suggest that this species may represent an as yet unrecognised genus.
Last update : 13/08/2018
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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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