Revision of the genus Coeliccia (Zygoptera: Platycnemididae) in Borneo. Part I: The borneensis-group of species

A revision of the borneensis-group of Coeliccia species from the SE Asian island of Borneo is presented. The group is characterised based on the form of the penis, the form of the posterior lobe of the female pronotum and the mesostigmal plates of the female. Six species are recognised as occurring in Borneo, of which one is described as new: C. kenyah spec. nov. Coeliccia campioni, often considered a junior synonym of C. borneensis, is shown to be a valid species and new records are provided. C. coomansi is shown to be a junior synonym of C. flavostriata. Redescriptions based on fresh material are provided for the female of C. borneensis and the male of C. campioni. The male of C. borneensis and the female of C. campioni are described for the first time. Variation in C. arcuata and C. flavostriata is discussed. Keys to both sexes and illustrations of important characters for all named species are given.