Odonata is the scientific term for the order of insects comprised of dragonflies (Anisoptera) and damselflies (Zygoptera). [See Dragonfly or Damselfly for an explanation of the difference between a dragonfly and a damselfly.]
Odonata is sometimes Anglicized to “odonates” but it seems to be becoming more fashionable to use “dragonflies” as the collective English/common term forcing the rather ugly [my opinion] term “true dragonflies” to be used for, well, dragonflies. I stick to Odonata or Odos for short. Besides, the word lends itself to irresistible puns like “Odo-nutters” (us) and “Odo-natter” (the blog). 😯
The Species section is the meat of our website and dedicates a page to each species keyed by scientific/binomial names rather than English/common names. This decision was based on opening the content to an international audience. The top level Species page also has some notes on species numbers by geographic region. [Here are some notes on naming.]
In my view there are 45 species of breeding Odonata in the UK. According to Grand/Boudot, there are 89 in mainland France, i.e. within relatively easy and fun (for us) reach; we travel there often. As opportunies arise we travel further afield and note what we’ve seen there, too.