Majoidea
Encyclopedia
Majoidea is a superfamily of crab
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...

s. It comprises six families:
  • Epialtidae
    Epialtidae
    Epialtidae is a family of crabs, containing the subfamilies:* Epialtinae MacLeay, 1838* Pisinae Dana, 1851* Pliosomatinae Števčić, 1994* Tychinae Dana, 1851...

  • Hymenosomatidae
    Hymenosomatidae
    Hymenosomatidae is a family of crabs with some 110 described species in nearly 20 genera. The following genera are placed in the Hymenosomatidae:*Amarinus*Apechocinus*Cancrocaeca*Crustaenia*Elamena*Elamenopsis*Guaplax...

  • Inachidae
    Inachidae
    Inachidae is a family of crabs, containing 39 genera:*Achaeopsis Stimpson, 1857*Achaeus Leach, 1815*Anisonotus A. Milne-Edwards, 1879*Anomalothir Miers, 1879*Bothromaia Williams & Moffitt, 1991...

  • Inachoididae
  • Majidae
    Majidae
    Majidae is a family of crabs, comprising around 700 marine species 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"...

  • Oregoniidae
    Oregoniidae
    Oregoniidae is a family of crabs, formerly included in the family Majidae. It contains the four genera Chionoecetes, Hyas, Macroregonia and Oregonia....


The families "Pisidae" and "Tychidae" are now treated as the subfamilies Pisinae and Tychinae of the family Epialtidae
Epialtidae
Epialtidae is a family of crabs, containing the subfamilies:* Epialtinae MacLeay, 1838* Pisinae Dana, 1851* Pliosomatinae Števčić, 1994* Tychinae Dana, 1851...

, and "Mithracidae" is now treated as the subfamily Mithracinae of the family Majidae
Majidae
Majidae is a family of crabs, comprising around 700 marine species 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"...

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