P O L S K I E P I S M O E N T O M O L O G I C Z N E The interlocking mechanism of maxillae and mandibles in Fulgoroidea (Insecta: Hemiptera: Fulgoromorpha)

ABSTRACT. The paper shows a general model of the internal structure of mouthparts in Fulgoroidea (Hemiptera: Fulgoromorpha), in cross-section through the subapical segment of rostrum. The study comprised 10 representatives of 8 various planthopper families. This is a comparative analysis of the connecting systems between right and left maxillae in Fulgoroidea. In the internal structure of mouthparts, three locks between maxillae have been identified: dorsal, middle and ventral. Straight, hooked and T-shaped processes form these locks. In all examined representatives of various families, the shape of the processes in corresponding locks is the same. A stable number of processes in particular locks have been observed in studied representatives of Fulgoromorpha families (dorsal lock -4, middle lock -3, ventral lock -2). The food and salivary canals are formed by both maxillae. In the examined species the closure of the salivary canal is similar at the family level. The interlocking mechanism between right and left maxillae is the same in representatives of various families. Mandibles in Fulgoroidea are not firmly connected with maxillae but only contiguous with their external wall