A LIGHT AND ELECTRON MICROSCOPE STUDY OFCYCLOTELLASPECIES (BACILLARIOPHYCEAE) FROM CENTRAL AND NORTHERN CANADIAN LAKES

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Abstract
Cyclotella species from several Canadian lakes have been investigated and their morphology illustrated by light and electron microscopy. Cyclotella antiqua W. Smith, C. bodanica var. bodanica Grun., C. bodanica var. affinis Grun., C. meneghiniana Kütz. and C. michiganiana Skvortzow have been identified with certainty although their cell diameters were smaller than those previously recorded in the literature. Differences and similarities in the C. bodanical/radiosa (Syn. comta)/comensis complex and in the Cyclotella stelligera group are discussed. One species appears to be identical to the newly described Stephanocostis chantaicus Genkal and Kuzmina. A new species (Cyclotella gordonensis nov. sp.) has been found so far only in deep, oligotrophic lakes of the Canadian Arctic.