Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Heterorhabdidae ( Family )
            Heterorhabdus ( Genus )
Heterorhabdus heterolobus  Park, 2000   (F,M)
Syn.: Heterochäta spinifrons (F) : Giesbrecht, 1892 (p.372, 382, figs.F, no M)
Ref.:
Park, 2000 (p.95, figs.F,M, Rem.)
Species Heterorhabdus heterolobus - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.215, Fig.63].
Female: a, b, urosome (left, dorsal, respectively); c, d, e, genital somite (left, right, ventral, respectively).

Male: f, P5 (anterior); g, second exopodal segment of left P5 (anterior); h, exopod of right P5 (posterior); i, basipod of right P5 (anterior); j, basipod of left P5 (anterior); k, distal end of exopod of right P5 (lateral).


Species Heterorhabdus heterolobus - Plate 2 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 39, Figs.42, 43]. As Heterochäta spinifrons.
Female: 42, genital segment (lateral, right side); 43, habitus (dorsal).
Nota: Ab 1-2 = urosomal metameres 1+2 fused.


Species Heterorhabdus heterolobus - Plate 3 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 39, Figs.52, 54]. As Heterochäta spinifrons.
Female: 52, head (lateral); 54, forehead (ventral.
Nota: R = rostrum with filamentsl).


Species Heterorhabdus heterolobus - Plate 4 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 20 , Fig.1]. As Heterochäta spinifrons.
Female:: 1, distal part of A1 (ventral view).


Species Heterorhabdus heterolobus - Plate 5 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 20 , Fig.9]. As Heterochäta spinifrons.
Female: 9, A2 (anterior view).


Species Heterorhabdus heterolobus - Plate 6 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 20 , Fig.24]. As Heterochäta spinifrons.
Female: 24, exopod of P1.


Species Heterorhabdus heterolobus - Plate 7 of morphological figuresHeterorhabdus heterolobus female:
1 - See key to species groups of Heterorhabdus: ''spinifrons'' Group (p.90, 91).
2 - Forehead with a spiniform process.
3 - Anterior wall of genital proninence without lobes (Fig.63-e).
4 - Dorsally, genital somite relatively short, with smoothly bulging lateral margins (Fig.63-b). Mx1 with 1 seta on basis and 3 sete on endopod.
5- Laterally, genital prominence short of reaching posterior end of somite, with posterior lobes (Fig.63-a, c, d).


Species Heterorhabdus heterolobus - Plate 8 of morphological figuresHeterorhabdus heterolobus male:
1 - See key to species groups of Heterorhabdus: ''spinifrons'' Group (p.90, 91).
2 - Forehead with a spiniform process.
3 - In right P5, basal inner lobe relatively long and somewhat fingerlike, medial projection of 2nd exopodal segment (Fig.63-h) with small terminal spiniform process and relatively well developed distal lobe.
4 - Basal inner lobe of right P5 (Fig.63-g) almost as long as segment, pointing distomediad. Endopod of Mx1 with 3 seta.
5 - 2nd exopodal segment of left P5 (Fig.63-j) with outer spine about as long as conical process. Terminal spine of 3rd exopodal segment of right P5 about 1/3 length of segment (Fig.63).
6 - Lateral margin of 3rd exopodal segment of right P5 (Fig.63-h) only moderately elbowed elbowed about 1/5 length of segment from distal end.
7 - Basal inner lobe of right P5 (Fig.63-f) with a shallow notch on lateral margin; in 3rd exopodal segment of right P5 (Fig.63-h), lateral margin only slightly elbowed about 1/5 length of segment from distal end, and distal lobe relatively short (Fig.63-k). In 2nd exopodal segment of left P5 (Fig.63-g), outer spine about as long as conical process.

NZ: 3

Distribution map of Heterorhabdus heterolobus by geographical zones
Loc:
Indonesia-Malaysia, Pacif. (equatorial central: E-W, S-N), off Columbia

Type locality: 02°57'N, 80°49'W.
N: 1
Lg.:
(46) M: 2,95; (824) F: 3,56-3,16; M: 3,28-2,96; {F: 3,16-3,56; M: 2,95-3,28}
Rem.: "Spinifrons" Group.
After Park (2000, p.96), Giesbrecht's figure (1892) as H. spinifrons of the genital somite in lateral view from the equatorial Pacific seems to be referable to H. heterolobus. The two species are similar but can be distinguished: In female, genital prominence far short of reaching posterior end of somite and with 2 sistict lobes along distal margin; in male P5, terminal spine of 3rd exopodal segment of right P5 relatively long, about 1/3 length of segment; outer spine of 2nd exopodal segment of left P5 relatively short, about as long as conical process of segment.
This species is also very close to H. quadrilobus, but its female can be distinguished by the absence of rounded lobes on the anterior wall of the genital prominence. In the males, these two species are so close to each other that they can be identified only by careful observations of such structures as the basal inner lobe and 3rd exopodal segment of the right P5 and the lateral conical process and outer spine of the 2nd exopodal segment of the left P5.
Last update : 06/01/2015
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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 23, 2021]

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