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Daphnia occidentalis, New Species (Cladocera: Daphniidae) from Western Australia: New Evidence on the Evolution of the North American D. ambigua-D. middendorffiana Group

John A. H. Benzie
Journal of Crustacean Biology
Vol. 6, No. 2 (May, 1986), pp. 232-245
Published by: on behalf of The Crustacean Society
DOI: 10.2307/1547984
Stable URL: http://www.jstor.org/stable/1547984
Page Count: 14
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Daphnia occidentalis, New Species (Cladocera: Daphniidae) from Western Australia: New Evidence on the Evolution of the North American D. ambigua-D. middendorffiana Group
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Abstract

Daphnia occidentalis, new species, a member of the subgenus Daphnia, is described from fresh-water pools in natural swamp vegetation in the Karri forest region of southwest Australia. It is established that the closest relative of this species is D. ambigua Scourfield, 1947, from North and South America. The D. ambigua-D. middendorffiana group of America was previously thought to have evolved relatively recently in the New World. The present results and an examination of the world distribution of all three species suggest that a Gondwanan, possibly Pangaean origin of the group is more likely.

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