Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Heterorhabdidae ( Family )
            Disseta ( Genus )
Disseta magna  Bradford, 1971   (F,M)
Syn.: Disseta coelebs Heptner, 1972 (p.1645, Descr.M, figs.M)
Bradford, 1971 a (p.133, Descr.F, figs.F); Bradford-Grieve,1999 b (p.74, Rem., figs.173, 191); Park, 2000 (p.20, figs.F,M, Rem.)
Species Disseta magna - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.158, Fig.6].
Female: a, habitus (left side); b, c, urosome (left, dorsal, respectively); d, e, genital somite (left, ventral, respectively); f, exopod of P5 (anterior).
Nota: Dorsally, genital somite relatively short, with smoothly curved lateral swellings.

Male: g, h, exopod of P5 (posterior, anterior, respectively); i, exopod of right P5 (posterior); j, right P5 with endopod omitted (anterior); k, left P5 (anterior); l, left P5 with endopod omitted (posterior); m, right P5 (posterior). mpr = medial projection.

Species Disseta magna - Plate 2 of morphological figuresissued from : M.V. Heptner in Zool. Zh., 1972, 51 (11). [p.1646, Fig.1]. As Disseta coelebs.
Male (from Bougainville Trench): 1-2, habitus (lateral and dorsal, respectively); 3, ornamentation on the cephalosome (dorsol portion); 4, cephalosome (lateral); 5, last thoracic segment and urosomal segments 1 and 2 (lateral); 6, caudal rami (dorsal); 7, P5; 8, P1.

Species Disseta magna - Plate 3 of morphological figuresissued from : J.M. Bradford in N.Z. Jl mar. freshw. Res., 1971, 5 (1). [p.134, Fig.11]. Female (from 41°47'S, 175°01'E): a-b, habitus (dorsal and lateral, respectively); c, genital segment (lateral, left side); d, A1; e, A2; f, Md (mandibular palp); g, Md (edge of mandibular blade); h, Mx1; i, Mx2; j, Mxp; k, P1; l, P2; m, external spine of exopodal segment 3 of P2; n, P3; o, P4; p, right P5; q, endopodal segment 2 of left P5.
Nota; A1 exceeding caudal rami by 5 segments.
Rostrum with 2 filaments.
Mx1 1st inner lobe with 14 spines and setae.
Rami of swimming leg exopods with a larger number of posterior surface glandular pores than D. palumbii
Genital segment widest anteriorly (in dorsal view).
Genital segment and urosomal segment 2 covered with very small spinules, and borderd posteriorly by fringe of spinules as is urosomal segment 3.

Species Disseta magna - Plate 4 of morphological figuresDisseta magna female:
1 - Dorsally, genital somite (Fig.6-c) relatively short, with smoothly curved lateral swellings.

Species Disseta magna - Plate 5 of morphological figuresDisseta magna male:
1 - Left P5 (Fig.6-h), 2nd exopodal segment without a large lateral spiniform process.
2 - Left P5 (Fig.6-k), 2nd endopodal segment with an anterodistal lobe; 3rd exopodal segment with a small terminal spine.

NZ: 5

Distribution map of Disseta magna by geographical zones
SW Indian, New Zealand (Cook Strait), off S Mangaia Is., W Pacif. (Bougainville Trench), Pacif. tropical (N-S), San Diego, N California, off Chile.

Type locality: 41°47'S, 175°01'E.
N: 3
(398) M: 8,15-8,60; (399) F: 8; (824) F: 8,66-7,75; M: 5,58-5,16; {F: 7,75-8,66; M: 5,58-8,60}
Rem.: bathypelagic- abyssopelagic.
Park (2000, p. 143) found this species in the low and midlatitudes of both the Pacific and Indian Oceans, accounted 6 % of specimens, vs 31 % for D. scopularis and 63 % for D. palumbii.
Last update : 17/10/2017
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 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 14, 2024]

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