Phylogenetic information reveals the peculiarity of Caryedon serratus (Coleoptera, Chrysomelidae, Bruchinae) feeding on Cassia sieberiana DC (Caesalpinioideae)

Studies over the past 20 years on natural populations indicated that sympatric speciation may be far more common and widespread among plants and animals than previously thought. By using molecular phylogenetics (on a combined data set of two genes), the relationships between Caryedon serratus native forms and forms feeding on groundnut was investigated. The specific objectives were to clarify the taxonomic status of C. serratus feeding on Cassia sieberiana DC. Morphological analysis was conducted, using parts of the adult specimens which were dry-mounted for the studies. Morphological study comprised extraction of the genitalia, which were cleared and mounted in Canada balsam following standard procedures. Results showed a strong differentiation of insects from different hosts’ trees, with specimens from C. sieberiana possibly representing a sibling species.