Ref ID : 3086
R. Chengalath and C.H. Fernando; The Planktonic Rotifera of Ontario with Records of Distribution and Notes on Some Morphological Variation. Canadian Field-Naturalist 87:267-277, 1973
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Two hundred fifty-two plankton samples collected from various parts of Ontario were studied and 53 species and two varieties of rotifers are reported, including eight new records for Canada. The number of species in a single sample, as compared to the total number of species present, was studied by regular sampling of four lakes. The composition of the Ontario planktonic rotifers shows a typical arctic-temperate species mix with only two endemics. Morphological variation, size of some species, foundation pattern, and hispidity of Keratella and introgression in Polyarthra are discussed. The importance of some taxonomic characters used in species diagnosis such as nuclei in the vitellarium, the throat pouch in Polyarthra, and the insertion of posterior setae in Filinia are also discussed.