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 Pippacirama Griffin & Tranter, 1986 Prismatopus Ward, 1933 Schizophroida T. Sakai, 1933 Schizophrys White, 1848 Seiitaoides Griffin & Tranter, 1986 Temnonotus A. Milne-Edwards, 1875 Teratomaia Griffin & Tranter, 1986 Thersandrus Rathbun, 1897 Tumulosternum McCulloch, 1913 Wilsonimaia † Blow & Manning, 1996 Micromaiinae † Beurlen, 1930 Micromaia † Bittner, 1875 Mithracia † Bell, 1858 Pisomaja † Lőrenthey, in Lőrenthey & Beurlen, 1929 Mithracinae MacLeay, 1838 Ala Lockington, 1877 Antarctomithrax † Feldmann, 1994 Coelocerus A. Milne-Edwards, 1875 Cyclocoeloma Miers, 1880 Cyphocarcinus A. Milne-Edwards, 1868 Leptopisa Stimpson, 1871 Macrocoeloma Miers, 1879 Micippa Leach, 1817 Microphrys Milne-Edwards, 1851 Mithraculus White, 1847 Mithrax A. G. Desmarest, 1823 Nemausa A. Milne-Edwards, 1875 Paranaxia Rathbun, 1924 Picroceroides Miers, 1886 Stenocionops A. G. Desmarest, 1823 Teleophrys Stimpson, 1860 Thoe Bell, 1836 Tiarinia Dana, 1851 Planoterginae Števčić, 1991 Hemus A. Milne-Edwards, 1875 Planotergum Balss, 1935
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