Flea

Tungidae – sticktight and chigoe fleas (chiggers)
Pulicidae – common fleas
Coptopsyllidae
Vermipsyllidae – carnivore fleas
Rhopalopsyllidae – marsupial fleas
Hypsophthalmidae
Stephanocircidae
Pygiopsyllidae
Hystrichopsyllidae – rat and mouse fleas
Leptopsyllidae – mouse and rat fleas
Ischnopsyllidae – bat fleas
Ceratophyllidae:-fleas mainly associated with rodents Amphipsyllidae
Malacopsyllidae
Dolichopsyllidae – rodent fleas
Ctenopsyllidae

Flea is the common name for any of the small wingless insects of the order Siphonaptera (some authorities use the name Aphaniptera because it is older, but names above family rank do not follow the rules of priority, so most taxonomists use the more familiar name). Fleas are external parasites, living by hematophagy off the blood of mammals and birds. Genetic and morphological evidence indicates that they are descendants of the Scorpionfly family Boreidae, which are also flightless; accordingly it is possible that they will eventually be reclassified as a suborder within the Mecoptera. In the past, however, it was most commonly supposed that fleas had evolved from the flies (Diptera), based on similarities of the larvae.