Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Heterorhabdidae ( Family )
            Mesorhabdus ( Genus )
Mesorhabdus gracilis  Sars, 1907   (F,M)
Sars, 1907 a (p.18, Rem.F); Sars, 1925 (p.235, figs.F,M); Sewell, 1948 (p.504); Heptner, 1972 a (p.58); Gaudy, 1973 a (p.948); Bradford-Grieve,1999 b (p.91, figs.F,M, Rem., figs.176, 191); Park, 2000 (p.32, figs.F,M); Boxshall & Halsey, 2004 (p.125: fig.M); Vives & Shmeleva, 2007 (p.318, figs.F,M, Rem.)
Species Mesorhabdus gracilis - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.165, Fig.13].
Female: a, b, urosome (left, dorsal, respectively); c, d, genital somite (left, ventral, respectively); e, left Mx1 (posterior); f, first segment of left Mx2 (posterior); g, right Mxp (anterior).

Species Mesorhabdus gracilis - Plate 2 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.166, Fig.14].
Female: a, exopod of P1 (anterior); b, exopod of P2 (anterior); c, exopod of P3 (anterior); d, exopod of P4 (anterior); e, P5 (anterior).

Male: f, g, urosome (right, dorsal, respectively); h, P5 (anterior); i, exopod of left P5 (posterior); j, exopod of right P5 (posterior); k, second exopodal segment of right P5 (anterior).

Species Mesorhabdus gracilis - Plate 3 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.LXVI, figs.1-13].
Female (from around Azores Islands & Canary Islands): 1, habitus (dorsal); 2, rostrum; 3, A2; 4, Md (right cutting blade); 5, Md (left cutting edge); 6, Mx1; 7, Mx2; 8, P1; 9, P3; 10, P5; 11, urosome (lateral left side); 12, anal segment and caudal rami (dorsal).

Male: P5.

Species Mesorhabdus gracilis - Plate 4 of morphological figuresMesorhabdus gracilis female:
1 - Genital somite without spinules along posterior margin; oral cone with low anterior labral lobe; Coxa of Mxp not with 1+2+3 setae.
2 - Coxa of Mxp2 with 1+1+2 setae; endopod of Mx1 with 3 setae, exopd with 5+4 setae (Fig.13-e); Mx2 with 5 setae on 1st lobe and 3 setae on 2nd lobe (Fig.13-f); dorsally, anal segment with 1 pore on each side; caudal ramus with a large pore close to posterior end (Fig.13-b).

Species Mesorhabdus gracilis - Plate 5 of morphological figuresMesorhabdus gracilis male:
1 - In right P5, 2nd exopodal segment with medial projection at distal end of segment.
2 - Mx1 with 3 setae on endopod and 5+4 setae on exopod (Fig.13-e); dorsally, caudal ramus with 1 pore close to posterior end (Fig.14-g).

Compl. Ref.:
Lozano Soldevilla & al., 1988 (p.59); Shih & Young, 1995 (p.70)
NZ: 8

Distribution map of Mesorhabdus gracilis by geographical zones
Atlant. (S tropical), Caribbean Sea, N Madeira, Azores, Canary Is., SW Indian, America (W central - off California, China Seas (South China Sea)in Shih & Young, 1995), N Tasman Sea
N: 6
(1) F: 4,54; (824) F: 5,58-4,83; M: 4,91; (909) F: 3,7; {F: 3,70-5,58; M: 4,91}
Rem.: bathypelagic.
Last update : 26/01/2016
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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 21, 2024]

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