Myrmica ruginodis is a common red ant and could well be Britain’s commonest ant. Workers are 4–6 mm long, slender and usually fairly slow moving. The antennal scapes are long and slender with a gentle curve at the base. The area between the spines on the propodeum has ridges across it and the spines are usually long. The petiole node has a flat dorsal top with a distinct angle to the posterior area and this is the easiest character with which to separate them from M. rubra (Linnaeus). Queens are similar to workers and 5.5–7 mm long. Some nests will have microgyne queens that are about the same size as workers. Males are fairly large at 5–6mm and have scapes that are long and slender. The male tibia and tarsi have short, semidecumbent hairs.
Common all over the British Isles.
Occurring throughout Northern Eurasia.