Baetidae

Baetidae is a family of mayflies with about 1000 described species in 110 genera distributed worldwide. These are among the smallest of mayflies, adults rarely exceeding 10 mm in length excluding the two long slender tails and sometimes much smaller, and members of the family are often referred to as small mayflies or small minnow mayflies. Most species have long oval forewings with very few cross veins (see Comstock-Needham system) but the hindwings are usually very small or even absent. The males often have very large eyes, shaped like turrets above the head (this is known as "turbinate

thumb|upright=0.6|Nymph (biology)|Nymph|alt=Drawing of nymph of Baetis sp. thumb|upright|Male imago of Baetis tricaudatus thumb|Baetis sahoensis

Pseudocloeon is a genus of mayflies belonging to the family Baetidae.

Americabaetis is a genus of mayflies in the subfamily Baetinae.

species of insect

Afroptilum is a genus of mayflies belonging to the family Baetidae.

Alainites is a genus of Palaearctic and Oriental mayflies in the family Baetidae, erected by R.D. Waltz et al. in 1994. About eight species are predominantly European, with A. muticus previously considered a species group of the genus Baetis (which was subsequently recognised as polyphyletic). The latter is sometimes called the "iron blue", although this name is used by anglers to include at least two species in the related genus Nigrobaetis and has a widespread distribution, including the British Isles.