submentum

This may be subdivided into a proximal submentum and a distal mentum.

The broad basal portion of labium is divided into submentum, mentum, and prementum.

The gula and submentum are often fused into a single sclerite, the gulamentum (Fig. 6B).

It consists of a basal submentum, which connects with the prementum through a narrow sclerite, the mentum.

The major differences are in the larval morphology, because they have the prosternal skin attached to the base of the submentum, rather than with the gula such as all other Cerambycidae.

The postmentum remains undivided in the Thysanura, Isoptera and some higher orders but in many Orthopteroid insects it is divided transversely into a distal mentum and a proximal submentum.

Or, as among Coleoptera, a median ventral sclerite or gula (not necessarily homologous in all the orders in which it occurs) extends from the occipital foramen to the base of the submentum (Duporte, 1962).