. The Canadian field-naturalist. (a) Lampsilis siliquoidea. Figure 2. Distributions of: (a) Lampsilis siliquoidea and (b) Cyclonaias tuberculata in the lower Great Lakes drainage basin, based on historical data. specimens collected live vs. dead, and number of species collected at a given site. The database currently consists of over 4100 records collected from approximately 1500 sites between 1860 and 1996. A record is defined as the occurrence of a given species at a given location on a given date. The locations of all collection sites repre- sented in the database are shown in Figure la. It
. The Canadian field-naturalist. (a) Lampsilis siliquoidea. Figure 2. Distributions of: (a) Lampsilis siliquoidea and (b) Cyclonaias tuberculata in the lower Great Lakes drainage basin, based on historical data. specimens collected live vs. dead, and number of species collected at a given site. The database currently consists of over 4100 records collected from approximately 1500 sites between 1860 and 1996. A record is defined as the occurrence of a given species at a given location on a given date. The locations of all collection sites repre- sented in the database are shown in Figure la. It is apparent that rivers and streams draining into central and western Lake Ontario have been sampled the least intensively. A total of 40 species of mussels belonging to three subfamilies of the Family Unionidae (Anodontinae, Ambleminae and Lampsilinae) have been reported from the study area (Table 1). The Family Margaritiferidae is not repre- sented in the basin. As Clarke (1981) is the recog- nized authority on freshwater mussels in Canada, it may be helpful to identify instances where the taxon- omy in Table 1 differs from that of Clarke. The dif- ferences are as follows, with Clarke's nomenclature. 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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