Obtusitermes monomorphus, a new termite species (Isoptera: Termitidae: Nasutitermitinae) from Panama

Obtusitermes monomorphus sp. nov. is described from the monomorphic soldier and worker castes. The two described congeners, O. panamae (Snyder, 1924) and O. formosulus Cuezzo and Cancello, 2009 both have dimorphic soldiers and workers. It is now demonstrated that the major worker hindgut of all three Obtusitermes species are unique among other termite taxa in due to the first proctodeal segment connected to the third proctodeal segment by a very long and tubular enteric valve (second proctodeal segment) with weak armature at both ends and a curvature of 180°. Additionally, Obtusitermes monomorphus is compared with other small monomorphic nasutitermitines of Panama.