Fossil and Living Conchostracan Distribution in Kansas-Oklahoma across a 2OO-Millon-Year Time Gap

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Science  24 Feb 1961:
Vol. 133, Issue 3452, pp. 584-586
DOI: 10.1126/science.133.3452.584


Fifty-nine of 493 ponds sampled in the Wellington fossil conchostracan belt contained Cyzicus mexicanus (Claus). Persistent habitat preference and faunal association were also found for four orders of insects (Odonata, Ephemeroptera, Neuroptera, and Homoptera). Comparative limnology is detailed. Greater geographic fractionation of Permian conchostracan gene-pools is attributed to a more arid climate indicated by evaporites.