antennal scrobes lightly impressed (Tetramorium caldarium)
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Used to distinguish Tetramorium caldarium from Tetramorium simillimum but can be very subtle and difficult to observe. In the former species, the antennal scrobe is weakly impressed, and the frontal carina does not remain a distinct outside border of the scrobe, often disappearing or becoming very faint at its most posterior section.
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