By Ifham Nizam – divaina.lk
Scientists have rediscovered Sri Lankan Clubtail (Anisogomphus ceylonicus), one of the rarest species of dragonflies in the country. The team that made the discovery comprised Amila Sumanapala of the Department of Zoology and Environment Sciences, University of Colombo, T. Ranasinghe of the Butterfly Conservation Society of Sri Lanka, and D. Sumanapala of the Faculty of Graduate Studies, University of Sri Jayewardenepura. According to lead scientist Amila Sumanapala Sri Lankan Clubtail is one of the rarest species of dragonflies.
First collected in 1859, it was only known from the original collection and another collection record made a century after in 1962. This species had not been found anywhere in Sri Lanka for close to 60 years until the team encountered a larva during a survey conducted in 2021.
Anisogomphus ceylonicus is one of the few Odonates of Sri Lanka with no photographic records of a living specimen available hitherto.
The present observation provides the first photographs of a live A. ceylonicus larva and the most recent documentation of the species. These observations, coupled with previous work (Lieftinck 1971, Bedjanič & van der Poorten 2013), provide an improved understanding of the species, which might enable further targeted surveys to be made
It was first discovered from Ramboda over 140 years ago based on a female specimen, which was originally described as Gomphus ceylonicus and later assigned to the genus Heliogomphus by F.C. Fraser (Bedjanič & van der Poorten 2013). Almost a century later, Lieftinck (1971) collected an immature male and its exuvia of a clubtail dragonfly from Rambukpath Oya, 10 miles northwest of Hatton in 1962 and described it as Anisogomphus solitaris. However, Bedjanič & van der Poorten (2013) recognized that H. ceylonicus is conspecific with A. solitaris, and thus reassigned it to the genus Anisogomphus. Since the discovery of the species, only these two records have ever been documented (Bedjanič et al. 2014), despite odonatological surveys and numerous biodiversity explorations conducted countrywide.