Siphonaptera (Fleas) is a group of insects. There are 2047 species of fleas, in 241 genera and 18 families. This group has been around since the callovian age.
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: An interaction relationship involving a predation process, where the subject kills the target in order to eat it or to feed to siblings, offspring or group members