Tetramorium caespitum have dark brown bodies with pale legs. Both queen and male ants are larger than workers. Both queens and males have wings, which fall off shortly after mating. A typical worker (which is an unfertilized, sterile female) is about 3.25mm while the queen is about 8mm long. Pavement ants have 12-segmented antennae with a three -segmented club. On females, the thorax has a pair of small spines on the upper part while males do not have spines on their back. A stinger is present, and the pedicel has two segmented parts. Worker pavement ants have distinguishing characteristics. They have two clearly visible humps, and grooves or ridges running from anterior to the posterior part of their bodies (National Pest Management Assoc., 2001).
A colony can sustain about 10,000 workers who weigh about 6.5g in the aggregate (Wilson 1971).
Range length: 2 to 4 mm.
Average length: 3.25 mm.
Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry ; polymorphic ; venomous