Majidae
Majidae is a family of crabs, comprising around 200 marine species inside 52 genera, with a carapace that is longer than it is broad, and which forms a point at the front. The legs can be very long in some species, leading to the name "spider crab". The exoskeleton is covered with bristles to which the crab attaches algae and other items to act as camouflage.
Genera
The roughly 200 extant and over 50 extinct species are divided among 52 genera in 5 subfamilies:
Eurynolambrinae Števčić, 1994
Eurynolambrus H. Milne-Edwards & Lucas, 1841
Majinae Samouelle, 1819
Ageitomaia Griffin & Tranter, 1986
Anacinetops Miers, 1879
Choniognathus Rathbun, 1932
Cyclax Dana, 1851
Entomonyx Miers, 1884
Eurynome Leach, 1814
Jacquinotia Rathbun, 1915
Kasagia Richer de Forges & Ng, 2007
Kimbla Griffin & Tranter, 1986
Leptomithrax Miers, 1876
Maiopsis Faxon, 1893
Maja Lamarck, 1801
Majella Ortmann, 1893
Microhalimus Haswell, 1880
Naxia Latreille, 1825
Notomithrax Griffin, 1963
Paraentomonyx T. Sakai, 1983
Paramithrax H. Milne-Edwards, 1837