Characteristics

Cataulacus shares the following synapomorphies with the Cephalotini (Bolton 2003):

• Abdominal segment III with tergosternal fusion
• Tergite of abdominal segment IV hypertrophied, comprising entire dorsum of gaster in dorsal view
• Ileum dilated and thickened to accommodate microorganisms

In addition, the genus has the following apomorphies:

• Antennal sockets very widely separated
• Antennal scrobe present that extends below the eye; scape, when laid back, passes below the eye
• Slight sexual dimorphism
• Male volsella without cuspis