Sargassum swimming crab
A species of Portunus Scientific name : Portunus sayi Genus : Portunus
Sargassum swimming crab, A species of Portunus
Botanical name: Portunus sayi
Genus: Portunus
Content
Description
Photo By d99 , used under CC-BY-NC-4.0 /Cropped and compressed from original 
Description
Portunus sayi grows to a length of about 5 to 7.5 cm (2 to 3 in). Its smooth, shiny carapace is nearly twice as broad as it is long and has six frontal teeth on each side. The chelipeds (claws) are larger in males than in females and the spines they bear have orange margins. The carapace, claws and legs are usually pale brown with large white or flesh-coloured blotches but the brown colour may have a purplish or greenish tinge. This crab, like other members of its family, is specially adapted for swimming rather than walking as its fourth pair of legs are modified with flattened, paddle-like surfaces. It swims sideways rather than forwards and can move surprisingly swiftly.
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Scientific Classification
Phylum
Arthropods Class
Malacostracans Order
Crabs Family
Swimming crabs Genus
Portunus Species
Sargassum swimming crab 
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