Abstract
An odonate survey was conducted throughout the southwestern region of Bangladesh, concentrating on eight districts and the Sundarban, from August 2014 to August 2016. A total of 50 species under 30 genera belonging to six families was recorded during the study period. Among these, 31 species belonged to Anisoptera and 19 to Zygoptera suborders. Libellulidae and Coenagrionidae were the most dominant anisopteran and zygopteran families with 28 and 17 species, respectively. One Zygoptera species Mortonagrion varalli was newly added to the odonate fauna of Bangladesh. 
Highlights
Odonates are one of the earliest winged insects developed in Permian period (Kalkman et al 2008) and distributed all over the world except Antarctica (Silsby 2001; Grimaldi and Engel 2005; Trueman 2007)
We have updated the checklist of the south-west region of Bangladesh which consists 50 species and added a news species to the current checklist of the dragonflies and damselflies of Bangladesh
Our study shows that, species richness is influenced by seasonal variation such as temperature, rainfall and humidity
Summary
Odonates (dragonflies and damselflies) are one of the earliest winged insects developed in Permian period (Kalkman et al 2008) and distributed all over the world except Antarctica (Silsby 2001; Grimaldi and Engel 2005; Trueman 2007). Dragonflies are highly distributed in diverse ecological niches, they are very sensitive to the alteration of their habitats. 5740 species of Odonata known from diverse ecological niches throughout the world (Subramanian 2009). Their foraging and reproductive success depends heavily on the water reservoirs. Odonata diversity varies in different climatic zones. Bangladesh being located in the Indo-Burma biodiversity hotspot zone possesses high odonata diversity.
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