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Eighteen species of Cryptophaginae are now known to occur in Atlantic Canada. Eight of these including Cryptophagus difficilis Casey, Cryptophagus jakowlewi Reitter, Cryptophagus laticollis Lucas, Cryptophagus mainensis Casey, Cryptophagus tuberculosus Mäklin, Pteryngium crenatum (Gyllenhal), Telmatophilus americanus LeConte and Caenoscelis basalis Casey, are newly recorded in Atlantic Canada; one of which, C. mainensis, is newly recorded in Canada, and another, C. laticollis, is newly recorded in eastern North America. Nineteen new provincial records are reported with the result that five species of Cryptophaginae are now known from New Brunswick, 14 from Nova Scotia, four from Prince Edward Island, 10 from insular Newfoundland, and four from Labrador. A new early date of detection (1986) is reported for the adventive Palaearctic Telmatophilus typhae (Fallén) in North America. Keys to identification are provided for the genera Antherophagus, Cryptophagus, and Telmatophilus and the composition, zoogeography, and bionomics of the group in Atlantic Canada are discussed. [ABSTRACT FROM AUTHOR]

Reviewing published coccinellid surveys we found that the number of adventive species has increased steadily over the last century while the average proportion of native individuals has remained fairly constant until 1987 followed by a rapid decrease between 1987 and 2006. Seven long-term studies indicated that the total density of coccinellids increased by an average of 14% following establishment of adventive species, but this increase was not significant and in 4 of 7 cases the total density of coccinellids actually decreased following establishment. Similarly, no significant difference was found in comparisons of diversity across all studies. These results illustrate that even with multiple long-term data sets it is currently difficult to make any general conclusions regarding the impact adventive coccinellids have had on native coccinellid assemblages. However, it is clear that specific systems and species have seen major shifts in recent years. For example, adventives have become the dominant species in a third of the assemblages where they are found. Focusing on two formerly common native species, Adalia bipunctata and Coccinella novemnotata, we show they have become rare in their former ranges and discuss potential explanations for this phenomenon. [ABSTRACT FROM AUTHOR]