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Copromyxella: A New Genus of Acrasidae

Kenneth B. Raper, Ann C. Worley and Terrence A. Kurzynski
American Journal of Botany
Vol. 65, No. 9 (Oct., 1978), pp. 1011-1026
Stable URL: http://www.jstor.org/stable/2442688
Page Count: 16
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Copromyxella: A New Genus of Acrasidae
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Abstract

A new genus of cellular slime molds, Copromyxella, is described together with four species that comprise it Since it resembles Zopf's Copromyxa more than any genus presently recognized, but differs from it in important characteristics such as the smaller dimensions of its cellular elements and the delicacy of its fructifications, the name Copromyxella is chosen for the new taxon Four species are included: C silvatica, C. filamentosa, C. spicata, and C. coralloides. All are characterized by small myxamoebae with lobose and potentially "explosive" pseudopodia and may assume limax forms in liquid media; all possess nuclei with centrally positioned nucleoli; all lack true contractile vacuoles (with a single possible exception); all aggregate without stream formation; and all form fructifications with no demarcation into stalks and sori. Taxonomically the genus belongs in the Acrasidae with Copromyxa, Guttulinopsis and Acrasis rosea rather than in the better known Dictyostelidae that includes Dictyostelium and Polysphondylium.

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