Ridgewayia sp. Krishnaswamy - 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. (Krishnaswamy, 1953) (M)

Abbreviations or symbols

Syn.:

Suezia sp. Krishnaswamy,1953 (p.127)

Ref.:

(

List of the studied authors )

M.S. Wilson, 1958 (p.143, 144, Rem.); Humes & Smith, 1974 (p.130, Rem.)

issued from : M.S. Wilson in Proc. U.S. Nat. Mus., 1958, 108 (No 3398). [p.169].
Inner seta of basipod 1, swimming legs P1 to P4 of Ridgeyaia; + present; - absent; ? unknown.

issued from : M.S. Wilson in Proc. U.S. Nat. Mus., 1958, 108 (No 3398). [p.169, Table 2].
Total number of spines and setae on segment 3 of exopod and endopod, swimming leges P1 to P4 of Ridgeyaia.

issued from : M.S. Wilson in Proc. U.S. Nat. Mus., 1958, 108 (No 3398). [p.173, Table 4].
Comparative characters of Male P5 in Ridgeyaia.

issued from : M.S. Wilson in Proc. U.S. Nat. Mus., 1958, 108 (No 3398). [p.168, Table 1].
Setation of Mx1 in Ridgewayia. Unknown for R. canalis and Ridgewayia sp. from Madras.

NZ:

Distribution map of Ridgewayia sp. by geographical zones

Distribution map of Ridgewayia sp. for the Zone Indian Ocean

Loc:

(

Geographical glossary )

India (Madras coast)

Lg.:

(

References of the authors concerning dimensions )

(795) M: 0,679; {M: 0,68}

Rem.:

? Cf'. Ridgewayia typica (M).
For M.S. Wilson (1958 , p.143) the record is the same from geographic region as R. typica ad raises the question of whether it may represent the male of that species. Unfortumaterly, the description given is too incomplete to allow for any decision. The left P5 resembles Gurney's figures in Suezia. canalis exactly, while the right exopod of P5 differs from it in the 2nd segment being shorter. One of the figures given by Krishnaswamy is the last thoracic segment which shows a spinous point somewhat similar to that of R. typica, but smaller. In the figure of P1, both spines and processes are solidly inked, so that they cannot be distinguished from one another; the long inner apical spine of exopodal segment 3 is shorter than that shown for typica, being equal to the length of the length of the third segment plus about half of segment 2, and may thus indicate that the two species are not conspecific. The left exopod of P5 is relatable to the American species and is not identical to that of canalis. The important characteristics of the leg are: Right and left basipods about equal length; the first segments not fused; left segment 2 with inner seta; right 2nd exopod segment only little longer than the first, with one prominent, proximally placed outer marginal spine, beyond this spine the margin with a pair of closely set points beyond which the segment is abruptly shortened, narrowed, and inwardly directed; right exopod reaching beyond exopod, with 3 inner marginal setae; left exopod shortened but 3-segmented, nor reaching to end of right exopod, segments 1 and 2 with prominent outer spines about as long as total exopod and closely set to one another, exopod segment 3 reduced; left endopod reaching to end of exopod, unarmed. There is little doubt that this Madras specimen represents a different species from canalis. A complete comparison of appendages between typica and the Madras's specimen does not permit if the males are conspecific.

Last update : 30/01/2015


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