Triodontella alni is a species of beetle of the family Scarabaeidae. It is found in Italy (Sardinia).
Description Adults reach a length of about 5–7 mm. They have a brownish-black, rather shiny body. The antennae and legs are reddish-brown. The sides of the pronotum are lightened, as is the base, in front of the scutellum (the latter is also testaceous). The elytra are brownish-black.
Subspecies Triodontella alni alni (Sardinia) Triodontella alni luteipes (Fairmaire, 1881) (Sardinia)
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