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Baetidae is a family of mayflies with about 900 described species 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 condition").

A baetid mayfly emerging from its exuvia

Baetids breed in a wide range of waters from lakes and streams to ditches and even water butts. The nymphs are strong swimmers and feed mainly on algae.

• Chinery, Michael Collins Guide to the Insects of Britain and Western Europe 1986 (Reprinted 1991)
• McGavin, George C. Insects and Spiders 2004
• Fauna Europaea
• Nomina Insecta Nearctica

The Family Baetidae is a member of the Superfamily Baetoidea. Here is the complete "parentage" of Baetidae:

• Domain: Eukaryota Whittaker & Margulis,1978 - eukaryotes
  • Kingdom: Animalia C. Linnaeus, 1758 - animals
    • Subkingdom: Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
      • Branch: Protostomia Grobben, 1908 - protostomes
        • Infrakingdom: Ecdysozoa A.M.A. Aguinaldo et al., 1997 ex T. Cavalier-Smith, 1998 - ecdysozoans
          • Superphylum: Panarthropoda Cuvier
            • Phylum: Arthropoda Latreille, 1829 - Arthropods
              • Subphylum: Mandibulata Snodgrass, 1938
                • Infraphylum: Atelocerata Heymons, 1901
                  • Superclass: Panhexapoda
                    • Class: Insecta C. Linnaeus, 1758 - Insects
                      • Subclass: Dicondylia
                        • Infraclass: Pterygota - Winged Insects
                          • Order: Ephemeroptera Hyatt & Arms, 1891 - Mayflies
                            • Suborder: Pisciforma
                              • Superfamily: Baetoidea
                                • Family: Baetidae Leach, 1815 - Small Minnow Mayflies