eyed elater click beetles, like this Alaus oculatus from Florida, are the biggest click beetles (Elateridae) found in temperate North America.
Click beetles are best known for their eponymous clicking ability- a sort of elastic locking mechanism on their thorax can snap open with a loud clicking sound, which helps them startle or escape the grasp of predators and allows them to launch themselves into the air when overturned (you can see that in slow motion at the end of the video)
(more elating click beetle trivia below!)
They live around decaying trees and logs, the adults feeding on sap flows and other sugary liquids while the predatory grubs use their powerful jaws to tunnel in search of other wood-dwelling insect larvae to devour (by contrast many smaller click beetle larvae, often called wireworms, feed on rotting wood itself or other plant matter). To rear these beetles in captivity it’s necessary to keep the larvae in containers made of a hard material like glass, as they’ll chew through plastic and escape (I learned this the hard way the first time I found and attempted to raise a grub).
There are 6 Alaus species in the US, the largest of which can be over 5 cm long. Two are found in forests along the east coast- A. oculatus, the eastern eyed elater (below, left) and its smaller relative A. myops, the blind elater (right).
Even though the larvae don't feed directly on decaying wood, different Alaus species prefer different trees- oculatus breeds in dead oaks and other hardwoods, while myops found in the same habitats only use well-rotted pines.
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Eyed Click Beetle by Patrick Coin
Via Flickr:
Alaus oculatus found flying around in my yard in the afternoon, right after a front came through with heavy rain. It was so shiny--perhaps it was freshly emerged from the pupa.
