Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Augaptilidae ( Family )
            Alrhabdus ( Genus )
Alrhabdus johrdeae  Grice, 1973   (F)
Grice, 1973 (p.943, Descr.F, figs.F); Park, 2000 (p.8, Rem.)
Species Alrhabdus johrdeae - Plate 1 of morphological figuresissued from : G.D. Grice in Bull; Mar. Sci., 1973, 23 (4). [p.944, Fig.1-9].
Female (25°10'N, 77°25'W): 1, habitus (left lateral side); 2, head (left latera view); 3, anterior end of head (ventral); 4, posterior end of prosome and urosome (dorsal); 5, idem (left lateral side); 6, A1; 7, Md; 8, masticatory edge of Md; 9, Mx1.

Nota: A1 25-segmented, reaching to 2nd urosomal segment; distal segments more elongate than proximal ones.
A2 with elongate endopodal setae reaching to 4th pedigerous somite; exopod less than 1/2 length of endopod.
Md with small palp; exopod 1-segmented, endopod 2-segmented. Md blade with several large pointed teeth.
Mx1 with enlarged 1st inner lobe bearing 11 spines and setae; inner lobes 2 and 3 bear 1 and 3 setae, respectively; 2nd basal segment with 1, endopod with 3, and exopod with 6 setae, respectively.

Species Alrhabdus johrdeae - Plate 2 of morphological figuresissued from : G.D. Grice in Bull; Mar. Sci., 1973, 23 (4). [p.945, Fig.10-17].
Female: 10, Mx2; 11, Mxp; 12, distal end of Mxp; 13, P1; 14, P2; 15, P3; 16, P4; 17, P5.

Nota: Mx2 with 6 prominent lobes each bearing setae and spines; terminal spines robust.
Mxp basal segment with setae and spines variable lengths; 2nd segment with 3 marginal spines, distal spine long and slender.
P1 to P4 with 3-segmented exopods and endopods.
P5 with 3-segmented exopods and endopods, external margin of basis with long seta; internal margin of 2nd exopodal segment with short spines. Modified seta arising from 1st and 2nd endopodal segments lobate with sensory filament terminally.

NZ: 1

Distribution map of Alrhabdus johrdeae by geographical zones
NW Atlant (off Bahamas)
N: 1
? (No indicated)
Rem.: hyperbenthic (bathypelagic). Sampling depth 1733 m.
Until a male is found, it seems better to provisionally refer Alrhabdus to the Heterorhabdidae (Grice, 1973, p.946). Boxshall & Halsey (p.2004, p.68) include the genus as incertae sedis in Augaptilidae.
Last update : 20/02/2015
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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., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed December 08, 2022]

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Marine Planktonic Copepods

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