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image of Journal of Crustacean Biology

ABSTRACT A previously unknown genus and species of cyclopoid copepod, Stolonicyclops heggiensis, was discovered in seepage areas on Heggie's Rock, a granite monadnock in Georgia, U.S.A. The genus is characterized by leg 5 fused to the somite, with 1 dorsal seta and 2 ventral setae on a small knob; the antennule of 11 segments in the female; the swimming legs with 2-segmented rami, except leg 4 endopodite segments partly fused in the female; the spine and seta formulae of swimming legs 2,3,3,3 and 5,4,4,4, respectively; the lack of a seta on the medial (inner) corner of the coxopodite of legs 2-4; leg 4 endopodite segment 2 with 5 appendages; and the lack of sexual dimorphism in the swimming legs, except for the difference in leg 4 endopodite fusion. In several respects, S. heggiensis resembles Bryocyclops (Palaeocyclops) jankowskajae Monchenko from Kazakhstan and Uzbekistan. However, the lack of modified appendages of leg 3 in the male of S. heggiensis precludes assigning it to the genus Bryocyclops. The nature of leg 3 of the male and other plesiomorphic characters of S, heggiensis may indicate that its ancestor diverged earlier than Palaeocyclops from the Bryocyclops ancestral line.


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