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Ceratophyllus is a widespread genus of fleas found in temperate climates. Some of its members include the chicken flea, Ceratophyllus gallinae, and the poultry flea, Ceratophyllus niger.

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Ctenocephalides is a flea genus in the tribe Archaeopsyllini which includes the cat flea, Ctenocephalides felis and the dog flea, C canis. Species and subspecies in the genus infest a wide variety of hosts, including sheep and goats, wild carnivores, hares, hyraxes, ground squirrels and hedgehogs.

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Echidnophaga is a genus of fleas. It includes species which are found in Africa, parts of Asia, southern Europe, and Australia. Fleas in this genus remain attached to their host in a single location for long periods of time, causing swelling and ulceration of tissue. To remain attach for long periods they use specialized mouthparts, which, compared to other fleas, are relatively much longer.

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Nosopsyllus is a genus of fleas belonging to the family Ceratophyllidae.

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Pulex is a genus of fleas. It comprises seven species. One is the human flea, and five of the others are confined to the Nearctic and Neotropical realms.

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Saurophthirus is an extinct genus of giant stem-group flea, and the only member of the family Saurophthiridae. The type species, S. longipes is found in early Cretaceous strata of Baissa, Siberia. Two other species S. exquisitus and S. laevigatus is from the Lower Cretaceous aged Yixian Formation of China.

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Xenopsylla is a flea genus in the family Pulicidae.