Ridgewayia sp. M.S. Wilson - Species Card - Marine Planktonic Copepods

Species Card of Copepod

Calanoida ( Order )	details
Epacteriscoidea ( Superfamily )	details
Ridgewayiidae ( Family )	details
Ridgewayia ( Genus )	details	List species for this Genus

Ridgewayia sp. M.S. Wilson, 1958 (M juv.5)

Abbreviations or symbols

Ref.:

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List of the studied authors )

M.S. Wilson, 1958 (p.160, 162, figs. M juv.5); Humes & Smith, 1974 (p.130)

Species Ridgewayia sp. - Plate 1 of morphological figures

issued from : M.S. Wilson in Proc. U.S. nat. Mus., 1958, 108 (No. 3398). [p.159, Figs. 36-37].
Male (copepodid stage V) (from Dry Tortugas, Florida): 36, P5 (posterior view); 37, left A1 (segments 8-13, with armature of segment 9).
Nota: Head and 1st pedigerous somite separated. Urosome 4-segmented. caudal rami with more or less distinct division of a reduced 5th segment (?); 4th segment with distal row of fine spinules ventrally and on the lateral ares of the dorsal side. Caudal rami covered with hairs on both sides.. A1 25-segmented. All cephalic appendages weakly developed, but fully segmented. Exopod of A2 8-segmented. Mx2 with 6 lobes.Legs 1-4 fully segmented (segmentation and setation exactly as in R. gracilis and R. shoemakeri.

NZ:

Distribution map of Ridgewayia sp. by geographical zones

Loc:

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Geographical glossary )

NW Atlant. (Florida, Dry Tortugas, off Loggerhead Key)

Lg.:

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References of the authors concerning dimensions )

(516) juv.M: 0,69-0,665

Rem.:

For M.S. Wilson (1958, p.161 it does not seem possible to relate this subadult male to either of the Tortugas species. In many calanoid families the development of P5 is progressive, and, if such were known to be true in Ridgewayia, it might be assumed that these copepodids represent a third unknown species in which the right exopod may have inner apical setae, and the right endopod is also armed with setae. One interesting point brought out by examination of this copepodid is that the modified processes of P1 are not fully developed until the adult stage, although the leg is otherwise like that of the adult.

Last update : 26/01/2009


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