part_of anterior tentorial pit sibo SIBO:0000080 Anterior tentorial pits- A pair of pits of impressions located anteriorly on the dorsal surface of the head, at or very close to the posterior clypeal margin. The pits indicate the points of attachment of the anterior arms of the internal skeleton (tentorium) of the head to head capsule. The termination of the posterior arms of the tentorium are marked by a pair of posterior tentorial pits, which are located close to the occipital foramen (Bolton, B. (1994). Identificstion guide to the ant genera of the world. Cambridge, Mass., Harvard University PRess. pp.1-222). head