Internal ornamentation of the first proctodeal segment of the digestive tube of Syntermitinae (Isoptera, Termitidae)

The ornaments inside the first proctodeal segment of the digestive tube in thirty-three species of the termite subfamily Syntermitinae are described and illustrated, encompassing all genera of the subfamily. The occurrence, type and pattern of the ornamentation reveal a wide morphological diversity. A first proposal for classification and nomenclature of these structures and coverage patterns is included, as well as a discussion of possible functions