The copepod Eurytemora affinis (Poppe, 1880) and the polychaete Manayunkia speciosa Leidy, 1858 have been found in similar habitats within the Ottawa River . As both species show strong marine affinities and co-occurrence is not restricted to the Ottawa River, but rather is the pattern for North America, present evidence supports the theory that these animals may be relict forms resulting from the most recent marine incursion .
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