Siphonaptera (Fleas) is an order of insects. There are 2047 species of Fleas, in 241 genera and 18 families. This order has been around since the callovian age.
Definition: overall repetitive or reflective pattern in the body of one individual of this taxon. eg: bilateral symmetry, rotational symmetry, radial symmetry
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.