Heterosphyronida is a suborder of pseudoscorpions. There are 875 species of Heterosphyronida, in 57 genera and 3 families. This suborder has been around since the upper cretaceous epoch.
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)