Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Heterorhabdidae ( Family )
            Paraheterorhabdus ( Genus )
                Paraheterorhabdus ( Sub-Genus )
Paraheterorhabdus (Paraheterorhabdus) illgi  Park, 2000   (F,M)
Syn.: Heterorhabdus medianus (M) Park, 1970 (p.477, 525, figs.M, no F); Heptner, 1972 a (p.60)
Ref.:
Park, 2000 (p.80, figs.F,M, Rem.)
Species Paraheterorhabdus (Paraheterorhabdus) illgi - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.202, Fig.50].
Female (79,01°10'N, 11°36'W): a, habitus (left side); b, c, urosome (left, dorsal, respectively); d, forehead (dorsal); e, f, genital somite (left, ventral, respectively); g, masticatory edge of right Md (posterior); h, masticatory edge of left Md (posterior); i, left Mx2 (posterior); j, right Mxp (anterior).

Nota: in left Md, ventralmost tooth about 2 times length of corresponding tooth on right Md; masticatory edge between 2nd and 3rd, ventralmost teeth flat with a small round swelling close to 3rd.


Species Paraheterorhabdus (Paraheterorhabdus) illgi - Plate 2 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.203, Fig.51].
Female: a, P1 (anterior); b, exopod of P2 (anterior); c, exopod of P3 (anterior); d, exopod of P4 (anterior); e, P5 (anterior).

Male: f, P5 (endopods omitted), anterior; g, h, basipod of right P5 (anterior, posterior, respectively); i, exopod of left P5 (anterior); j, distal exopodal segments of left P5 (posterior).


Species Paraheterorhabdus (Paraheterorhabdus) illgi - Plate 3 of morphological figuresIssued from : T. S. Park in Bull. Mar. Sc., 1970, 20 (2). [p.524, Figs.262-264]. As Heterorhabdus medianus.
Male (from Caribbean Sea): 262, habitus (lateral left side); 263, idem (dorsal); 264, P5 (distal parts of endopods omitted), anterior).
Nota: Posterolateral corner of metasome in dorsal view triangularly produced.


Species Paraheterorhabdus (Paraheterorhabdus) illgi - Plate 4 of morphological figuresParaheterorhabdus (Paraheterorhabdus) illgi female: 1 - Left caudal ramus distinctly longer than right and completely fused with anal segment (Fig.50-c)
2 - Dorsally, posterolateral corners of prosome angular (Fig.50-c).
3 - Laterally, 2nd urosomal somite (Fig.50-b) without a swelling along ventral margin.
4 - Laterally, posterior slope of genital prominence slightly convex (Fig.50-e).
5 - Genital somite about as long as wide (Fig.50-c).
6 - Ventrally, genital operculum (Fig.50-f) longer than wide.


Species Paraheterorhabdus (Paraheterorhabdus) illgi - Plate 5 of morphological figuresParaheterorhabdus (Paraheterorhabdus) illgi female:
1 - Left caudal ramus distinctly longer than right and completely fused with anal segment.
2 - Basis of right P5 with conical inner lobe (Fig.49-e).
3 - P5 with relatively slender exopods (Fig.51-f); medial projection of 2nd exopodal segment of right P5 without a lobe on distal side.
4 - Medial projection of 2nd exopodal segment of right P5 (Fig.51-f) fingerlike.

NZ: 5

Distribution map of Paraheterorhabdus (Paraheterorhabdus) illgi by geographical zones
Loc:
Atlant. (equatorial & S tropical), off G. of Guinea W, Caribbean Sea, NE Indian (equatorial), SW Indian, off New Guinea, Pacif. (tropical central), Salomon Is., Pacif. (NE & SE)

Type locality: 79,01°10'N, 11°36'W.
N: 2
Lg.:
(88) M: 2,52; (824) F: 3,56-2,84; M: 3; {F: 2,84-3,56; M: 2,52-3,00}
Rem.: This species is named in honour of Professor Paul L. Illg, specialist in parasitic copepods, well known at Laboratore Arago (Banyuls-sur-Mer, France).
After Park (2000, p.80) the species can be distinguished from the congeners by the relatively short ventralmost of the left Md; the 3rd lobe of Mx2 with a seta and spine of similar length, the 4th lobe with 2 spines of greatly different length, spines of the 5th and 6th lobes with long unserrated distal sections; the coxa of Mxp with a relatively long 1st posterior distal seta, and the basis with a proximal medial margin fringed with setules. The female is very characteristic, having a small and narrow genital operculum and the male having an elongate and slightly curved medial projection on the 2nd segment of the right exopod
Last update : 27/01/2015
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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 20, 2021]

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