. The Canadian field-naturalist. 1973 Chengalath and Fernando: Planktonic Rotifera of Ontario 269. Figure 1. Distribution of lakes sampled in Ontario. Circles, 1967; closed squares, 1968; triangles, 1969; open squares, 1970; stars mark groups of lakes sampled. besides cosmopolitan, cosmotropical, arctic- temperate, and American. The Ontario fauna of 53 species and two varieties can be divided on this basis too. The cosmopolitan species found in Ontario number 25. Of the rest only two species, namely Trichocerca platessa, Myers and Brachionus havanaensis var. trahea (Murray) are endemic to the
. The Canadian field-naturalist. 1973 Chengalath and Fernando: Planktonic Rotifera of Ontario 269. Figure 1. Distribution of lakes sampled in Ontario. Circles, 1967; closed squares, 1968; triangles, 1969; open squares, 1970; stars mark groups of lakes sampled. besides cosmopolitan, cosmotropical, arctic- temperate, and American. The Ontario fauna of 53 species and two varieties can be divided on this basis too. The cosmopolitan species found in Ontario number 25. Of the rest only two species, namely Trichocerca platessa, Myers and Brachionus havanaensis var. trahea (Murray) are endemic to the Americas. In all 20 species are endemic to the Americas (Green 1972). The rest of the species are found in the arctic-temperate region. No species is endemic to Canada. Keratella is represented by more species than any other genus, a situation uni- versal in the arctic-temperate region. Also,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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