Ref ID : 3259
W.T. Edmondson; The Sessile Rotatoria of Wisconsin. Trans.Amer.Micros.Soc. 59(4):433-459, 1940
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1. The distribution of some species of sessile Rotatoria shows a marked dependence on certain substrate plants. Collotheca gracilipes Edmondson generally occurs only on Utricularia and seems to be independent of the chemical concentration over the rather wide range studied. 2. Collotheca algicola (Hudson) and its variety, Ptygura melicerta Ehrenberg and its varieties the ploimate Lindia enchromatica Edmondson seem to be lasiobionts, occurring only in heavy growths of algae. With the exception of P. melicerta socialis (Weber), these forms have been found invariably only in Gloeotrichia. Ptygura beauchampi n. sp. might be considered a lasiophil, for while it is most frequently found on a variety of substrates, it sometimes occurs in abundance in Gloeotrichia. 3. Ptygura barbata Edmondson, Collotheca campanulata (Dobie) and sometimes Floscularia janus (Hudson) tend to attach themselves commonly to epiphytic green algae. 4. Cupelopagis vorax (Leidy) is often found on broad leaves, which is advantageous to its method of feeding. 5. No sessile species is known to be limited to Sphagnum as are some Ploima, although several may live abundantly on it. 6. Different plant species may bear a different rotifer fauna in the same lake. 7. These limitations in distribution may depend upon physical factors (shape or condition of surface), physiological factors, or both.