Anisoptera (Dragonflies) is a suborder of Odonata. There are 3105 species of Dragonflies, in 366 genera and 11 families. This suborder has been around since the pliensbachian age. They are aerial animals.
Definition: The number of fossil occurrences in the Paleobiology Database (https://paleobiodb.org) that are identified as belonging to a particular taxon or any of its subtaxa.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)