Tetramorium simillimum is a small reddish species that sometimes has a darker brown to black gaster. It is slow moving, but can recruit strongly and defend food resources. In the field it is impossible to distinguish from Tetramorium caldarium. The species tends to nest and forage on the ground in disturbed areas.
The small species is T. simillimum, and the larger species is T. bicarinatum.
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