Dromiidae

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Dromia personata

…is a species of dromiid crab that occurs in the North Sea, Mediterranean Sea and parts of the northeastern Atlantic Ocean. They are typically found in areas ranging from the lower shore to depths of around 30 ft, however they are often found in caves as well. Like several other unrelated crab species the last two pairs of leg of D. personata are positioned dorsally and are used to hold a sponge in place as a form of camouflage.

Classification

Animalia-Arthropoda-Crustacea-Malacostraca-Decapoda-Brachyura-Dromiidae-Dromia-D. personata

Images: Hans Hillewaert and Tihomir Gržinčić

*they totally look like they’re wearing little beanies too.

“Furred Sponge Crab” (Pseudodromia latens)

…a species of ‘Sponge Crab’ (Dromiidae) which is distributed from the Namibian border and around the South African coast to Sodwana Bay, it is also recorded from the Indian Ocean. Like other members of its family Pseudodormia latens will cut a off 'piece’ of sponge and place it on its back, using its fifth pair of legs (which are specially bent upwards) to keep it in place. The sponge will then serve as a form of camouflage/protection for the crab.

Classification

Animalia-Arthropoda-Crustacea-Malacostraca-Decapoda-Brachyura-Dromiidae-Pseudodromia-P. latens

Image: Seascapeza

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Dromiidae

(Sponge Crabs)

Dromiidae is a family of crabs noted for their habit of putting a live sponge onto their “backs” to use as a shelter or camouflage. they hold them in place with a pair of modified back legs which bend upwards. Once the sponge is on the crab the crab will actually trim the sponge to fit the crabs needs using its claws, this is no harm to the sponge and actually benefits it as the sponge can get new bits of organic material from the waterstream as the crab moves around. it also looks like the crab is wearing a huge beanie.

Phylogeny

Animalia-Arthropoda-Crustacea-Malacostraca-Decapoda-Brachyura-Dromiidae

Source,Source

Sleepy Sponge Crab (Dromia dormia)

Also known as the common sponge crab, the sleepy sponge crab is a species of “sponge crab” (Dromiidae) which boasts a widespread distribution in the Indo-Pacific region. With its range extending from East Africa and the Red Sea through the Malay Archipelago, south to Queensland, north of China and Japan, and east to Hawaii and French Polynesia. Like other members of the family Dromiidae D. dormia will camouflage itself by cutting off a large piece of a sponge and placing it on its back, using its modified pair of back legs to keep it in place. 

Classification

Animalia-Arthropoda-Crustacea-Malacostraca-Decapoda-Brachyura-Dromiidae-Dromia-D. dormia

Image: Sasquatch