Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Heterorhabdidae ( Family )
            Heterorhabdus ( Genus )
Heterorhabdus longisegmentus  Park, 2000   (F,M)
Park, 2000 (p.126, figs.F,M, Rem.)
Species Heterorhabdus longisegmentus - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.248, Fig.96].
Female: a, urosome (left side); b, c, genital somite (left, ventral, respectively); d, urosome (dorsal).
Nota: Urosome 29% length of body. Length ratios of 4 urosomal somites and left caudal ramus 39.0 : 16.9 : 14.5 : 8.7 : 20.9 : 100. Dorsal appendicular seta on left caudal ramus only a little longer than that of right ramus. Anteriorly, each caudal ramus with 3 pores.

Male: e, P5 (distal exopodal segments omitted), anterior; f, P5 (endopods omitted), posterior; g, right P5 (endopod omitted), anterior; h, exopod of right P5 (posterior); i, distal end of exopod of right P5 (lateral); j, second exopodal segment of right P5 (posterior); k, exopod of left P5 (anteror).

Species Heterorhabdus longisegmentus - Plate 2 of morphological figuresHeterorhabdus longisegmentus female:
1 - See key to species groups of Heterorhabdus: ''abyssalis'' Group (p.90, 114).
2 - Genital somite without a conical projection mediodorsally (Fig.96- a, b).
3 - Laterally, genital somite without a tubercular outgrowth posteriorly on dorsal margin (Fig.96-b).
4 - Laterally, genital operculum far short of reaching posterior end of somite (Fig.96-a).
5 - Laterally, right and left genital flanges symmetrical.
6 - Laterally, genital prominence gradually merging onto ventral wall of somite (Fig.96-b).
7 - Dorsally, genital somite strongly asymmetrical (Fig.96-d).

Species Heterorhabdus longisegmentus - Plate 3 of morphological figuresHeterorhabdus longisegmentus male:
1 - See key to species groups of Heterorhabdus: ''abyssalis'' Group (p.90, 114).
2 - Basis of left P5 without a well-developed inner lobe (Fig.96-f).
3 - Basal inner lobe of right P5 armed with normal bristles (Fig.96-e, f).
4 - 3rd exopodal segment of right P5 with a short terminal lobe, equal to 1/3 length of terminal spine (Fig.96-g, i).
5 - Basal lobe of right P5 arising from anteromedial side of segment (Fig. 96-g).
6 - 2nd exopodal segment of left P5 with outer spine borne on a conical process (Fig.96-k).
7 - Basal lobe of right P5 with an additional row of bristles.
8 - 3rd exopodal segment of right P5 relatively long and straight (Fig.96-f).

NZ: 4

Distribution map of Heterorhabdus longisegmentus by geographical zones
W South Africa, SW Indian (between 35°S-17°S), New Zealand, W Pacif. (Salomon Is.)

Type locality: 33°47'S, 15°39'E.

For Park (2000, p.127), this species occurs only subtropical and temperate regions of the Southern Hemisphere; taken in the southeastern Atlantic between 33°47' S and 30°23' S and between 02°55' W and 15°39' E; in the southeastern Pacific at 41°26' S, 176°04' E and 09°25' S, 159°06' E, respectively; in the southwestern Indian Ocean between 35°00' S and 17°03' S and between the east coast of Africa and 66°05' E.
N: 1
(824) F: 3,24-2,64; M: 2,88-2,52; {F: 2,64-3,24; M: 2,52-2,88}
Rem.: "Abyssalis" Group.
For Park (2000, p.127) this species is very close to H. oikoumenikis.
Last update : 20/05/2017
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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 January 20, 2021]

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