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Family Epialtidae MacLeay, 1838 (Spider Crabs, Decorator Crabs)

2017
Carapace subcircular to pyriform, moderately to strongly convexed, usually longer than broad. Front with single or double spines. Orbits incomplete, reduced, never concealing cornea, postorbital spines sometimes present, intercalated spine usually absent, eyestalks usually short, but not always, often immovable or slightly movable.
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Swimming in Spider Crabs of the Genus Macropodia

Nature, 1960
THE only adult Brachyura which have previously been recorded swimming are the Portunidae, which do so by rapid paddling of the last pair of peraeopods. These are adapted for swimming by having the distal segments flattened, with the edges densely fringed with hairs.
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The Spider Crab

Scientific American, 1878
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Spider Crab

Scientific American, 1880
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