A beetle was a type of insect characterized by the first pair of wings being modified into hard, protective coverings.
Certain varieties of beetles were eaten by Ferengi, either alive or processed into various dishes. (DS9: "The Nagus", "The Assignment", "The Ascent")
One of the stories in The Adventures of Flotter children's holonovel series involved a giant beetle. (VOY: "Once Upon a Time")
During shore leave at Norcadia Prime in 2376, The Doctor planned to visit an exhibit on beetle larvae from the equatorial subcontinent at the Norcadian Museum of Entomology. (VOY: "Tsunkatse")