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T. tenebricosa measures 15–20 mm in length, is blue-black in colour and is both larger and more constricted on the base of its pronotum than the visually similar T. goettingensis (the lesser bloody-nosed beetle). The body is strongly curved and elytra smooth and finely punctuated. Its antennae are thick and well segmented, its legs have long tarsi and terminate with a double hook.
Diet and Behaviour
Timarcha tenebricosa is monophagous; the larva feed exclusively on bedstraws, especially species with tender leaves (such as Galium verum and Galium mollugo). The adult beetles usually move slowly on the ground, in the grass and herbaceous plants, mainly at night. As a defensive behaviour they exude droplets of their bright red-orange hemolymph by breaking thin membranes in their mouth, which is foul-tasting to predators. This phenomenon of "bleeding" exists in some other insects, such as ladybugs.
Eggs are laid in spring on bedstraw. Larvae may measure up to 20 mm and are blue-black in colour. The pupae overwinter.
- "Timarcha tenebricosa (Fabricius, 1775)". Coleoptera.org.uk. Retrieved 7 October 2017.
- Hubble, D. (2012). Keys to the Adults of Seed and Leaf Beetles of Britain and Ireland. Field Studies Council. p. 53. ISBN 9781908819086.
- Robertson, Matthew. "Staying Alive." Insects and spiders. Pleasantville, N.Y.: Reader's Digest Children's Books, 2000. 43.
- Bloody-nosed beetle (Timarcha tenebricosa) at arkive.org;
- "Wildlife: insects: Bloody-nosed Beetle" Tiscali Reference Encyclopedia;
- "Bloody-Nosed Beetles - Timarcha tenebricosa - UK Safari";
- "The Bloody-nosed Beetle (Timarcha tenebricosa)" Cambridge Green Belt Project;
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