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Propylaea quatuordecimpunctata is a European lady beetle that was
probably accidentally introduced to North America by shipping in the
St. Lawrence Seaway in the late 1960’s. These distinctively
coloured little (4 or 5mm) beetles did not show up in Ontario until
the 1990s, and only became common in the late 1990’s. They are
sometimes called Fourteen Spotted Lady Beetles, but that common name
is also applied to another species that occurs in Ontario, the highly
variable Calvia quatuordecimguttata. Calvia quatuordecimguttata is
perhaps better referred to as the Cream Spotted Lady-beetle, which
is the name used for this species in Britain.
Common names, like the “fourteen spotted lady beetle”
often refer to different species in different places, and lack the
accuracy of scientific names. Both Calvia and Propylaea have only
one species in North America, so you are being explicit enough by
just by calling them “Propylaea” and “Calvia”.
Calvia quatuordecimguttata occurs in a confusing variety of colour
forms, but is most commonly a dark beetle with large, cream-coloured
spots. It can always be distinguished from other other lady beetles
by its shiny pronotum (the pronotum is the plate right behind the
head). |
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