Species Card of Copepod
Calanoida ( Order )
    Calanoidea ( Superfamily )
        Megacalanidae ( Family )
            Elenacalanus ( Genus )
Elenacalanus sverdrupi  (Johnson, 1958)   (F)
Syn.: Bathycalanus sverdrupi M. W. Johnson, 1958 a (p.258, Descr.F, figs.F); Owre & Foyo, 1967 (p.34, Rem.); Björnberg, 1968 (p.81, Rem.); Michel, 1994 (p.186, Rem.); Andronov, 2014 (p.40, fig.: Mx2)
Ref. compl.: Grice & Hulsemann, 1967 (p.13)
Ref.:
Bradford-Grieve & al;, 2017 (p.151, Descr. F, figs. F, Rem., Fig.114: depth range)
Species Elenacalanus sverdrupi - Plate 1 of morphological figuresissued from : M. W. Johnson in Proc. Calif. Acad. Sc., 1958, XXIX (6) [p.259, Figs.1, 1a, 2]. As Bathycalanus sverdrupi.
Female (from 12°33'N, 164°49'E): 1, habitus (lateral); 1a, rostrum (anterior aspect engarged scale); 2, habitus (dorsal).

Nota: Head without crest and no horn-like process or sensory hairs.
- A1 25-segmented, reaching the end of the caudal rami; terminal segment of A1 very short.


Species Elenacalanus sverdrupi - Plate 2 of morphological figuresissued from : M. W. Johnson in Proc. Calif. Acad. Sc., 1958, XXIX (6) [p.261, Figs.3-6]. As Bathycalanus sverdrupi.
Female: 3, Mx1; 4, Md (mandibyular palp); 5, Md (mandibular blade); 6, A2.
b1 = 1st basis; b2 = 2nd basis; end = endopod; ex = exopod; L1-5 = external lobes; Li = internal lobes.


Species Elenacalanus sverdrupi - Plate 3 of morphological figuresissued from : M. W. Johnson in Proc. Calif. Acad. Sc., 1958, XXIX (6) [p.262, Figs.7-8]. As Bathycalanus sverdrupi.
Female: 7, Mxp; 8, Mx2 (L1-L5 = lobes of the bases).


Species Elenacalanus sverdrupi - Plate 4 of morphological figuresissued from : M. W. Johnson in Proc. Calif. Acad. Sc., 1958, XXIX (6) [p.263, Figs.9-14]. As Bathycalanus sverdrupi.
Female: 9, P1; 10, P2; 11, P3; 12, P4; 13, exopod of P1 abnormal; 14, P5.
Nota: The cutaneous pores of the ''maculae cribrosae'' (m.c) are arranged in clumps, not in an oval or ring.


Species Elenacalanus sverdrupi - Plate 5 of morphological figuresIssued from : V.N. Andronov in Russian Acad. Sci. P.P. Shirshov Inst. Oceanol. Atlantic Branch, Kaliningrad, 2014. [p.40, Fig.10, 1]. As Bathycalanus sverdrupi after Johnson, 1958.
1, Mx2.


Species Elenacalanus sverdrupi - Plate 6 of morphological figuresIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.155, Fig.107].
Female (from USNM101078): A, Mx1 (posterior surface; B, Mx1 praecoxal arthrite (anterior surface); C, P1.
Scale bars: 1.0 mm (C); 0.1 mm (A, B).

Nota:
- Anterior margin of forehead, in lateral view, projecting forwards and in dorsal view rostral branches partially visible.
- In lateral view, posterior corners of pediger 5 rounded.
- Genital double-somite swollen, symmetrical in dorsal view, much wider than long.
- A1 not extending to caudal rami.
- A2 exopod ancestral segment IV bearing short seta extending to segment VIII
- Md basis with 3 setae (Johnson, 1958).
- Mx1 praecoxal arthrite with 14 setae including 3 setae on posterior surface and 1 moderately long seta on anterior surface; coxal endite without setae; basal endites 1 and 2 with 2 and 1 seta, respectively; endopod segments with 1, 1, 4+1 small setae; basal exite without seta; epipodite with 7 long and 2 very short, reduced setae.
- Mx2 with terminal setae curved distally in semicircle and extending beyond rostrum, setae on coxal endite 2 particularly well developed, curled in semicircle and of similar length to terminal setae.
- Mxp syncoxa endite 4 longest seta extending beyond distal border of endopodal segment 2; endopodal segments 3-6 with 1, 1, 1, 2 setae respectively, apparently without any outer border setae on endopodal segments 5 and 6.
- P1 exopodal segment 3 with 2 outer border spines, proximal spine broken on mounted leg and probably longer than that illustrated by Johnson (1958).


Species Elenacalanus sverdrupi - Plate 7 of morphological figuresIssued from : J.M. Bradford-Grieve, L. Blanco-Bercial & G.A. Boxshall in Zootaxa, 2017, 4229 (1). [p.91, Table 11].
Morphological characters after identification key of Elenacalanus females and males.
Compare to other species of genus.

Main characters identification after species key :
1 - Head without crest..
2 - Mx1 basal endite 2 with 1 seta. (male unknown).

NZ: 3

Distribution map of Elenacalanus sverdrupi by geographical zones
Loc:
Gulf of Guinea, SW Indian, Pacif. (Marshall Is., depth: 2103 m)

Type locality: 12°33'N, 164°49'E.
N: 3
Lg.:
(405) F: 17-16,8; (140) F: 18; {F: 16,80-18,00}
Rem.: bathypelagic-abyssopelagic.
The describer mentions a total length of 17 mm, and in Owre & Foyo (1967) 18 mm for a female from a deep sample in the Gulf of Guinea (0°00', 7°18'E to 0°10'S, 7°19'E), wich makes it the biggest known calanoida. The biggest known copepod is Pennella balaenopterae, an external siphonostomatoida on the fin whale Balaenoptera physalus in the NE Atlantic, with dimensions of 24 ± 2.6 cm in the females ! (in Abaunza & al., 2001, p.196).
For Bradford & al. (2017, p.153) the species is distinguished of other members of the genus by: short blunty tapering rostral points direcred slightly anteriorly, the very short A1 not extending beyond the caudal rami, single seta on the Maxillule 2nd basal endite, usually long curled setae on Maxilla coxal endite 2.
Last update : 11/08/2018
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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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