Dardanus arrosor. Mediterranean hermit crab.
Class: Malacostraca Order: Decapoda Family: Diogenidae Genus: Dardanus Size: 6-8 cm
The color varies from bright red to bright orange. The eyes are bluish. Claws show hair-like spines and warty tubercles. The left claw is more developed than the right one. The abdomen is asymmetrical, bare and hidden within a shell.
Mediterranean Sea, Red Sea, Indo-West Pacific (Japan, New Zealand and Philippines)
Trapezia rufopunctata Rust-spotted Guard Crab
Class: Malacostraca Order: Decapoda Family: Trapeziidae Genus: Trapezia Size: to 2.5 cm
The carapace has a spectacular mottled drawing, with reddish spots on a white or pink background. The Guard crab lives symbiotically in association with coral ( Acropora / Pocillopora) hiding deep within the coral branches. It feeds on coral tissue and mucus, and use claws to ward off coral predators. ( In this photo it is inside a Pocillopora damicornis ).
Indo-Pacific, Maldives and Polynesia.
Achaeus japonicus Orangutan Crab
Class: Malacostraca Order: Decapoda Family: Inachidae Genus: Achaeus Size: to 2 cm
Thickly covered with fine hairs and debris. Reddish brown to brown or golden, very long legs and protruding eyes. It is frequently, but not always, found in association with the bubble coral.
West-Pacific from Indonesia to Fiji.
Neopetrolisthes maculatus Spotted Porcelain Crab
Class: Malacostraca Order: Decapoda Family:Porcellanidae Genus: Neopetrolisthes Size: to 3 cm
White undercolor with numerous fine red spots. It is a small, colourful crustacean with a porcelain-like shell. Porcelain crabs have large claws, which are used for territorial struggles, but not for catching food.
Achaeus japonicus in association with the coral bubble Plerogyra sinuosa. Plerogyra sinuosa is a jelly-like species of the phylum Cnidaria. It is commonly called "bubble coral" due to its bubbly appearance.
Spotted Porcelain Crab has a very unique mutualistic relationship with sea anemones like the the Heteractis magnifica or the Phymactis papillosa.
Hoplophrys oatesi Soft Coral Crab
Class: Malacostraca Order: Decapoda Family: Epialtidae Genus: Hoplophrys Size: to 1.5 cm
Pinkish white with pink to red line, band and spot marking. Covered with sharp spike-like tubercles. It lives on various species of soft coral in the genus Dendronephthya. It camouflages itself by mimicking the colours of the polyps among which it hides
Indo-West Pacific from Indonesia to New Caledonia and Fiji.
Hoplophrys oatesi adds further camouflage by attaching polyps to its carapace. Colours vary depending on the colour of the coral, and may be white, pink, yellow or red.
Class: Malacostraca Order: Decapoda Family: Epialtidae Genus: Xenocarcinus Size: to 1.5 cm
Red to orange or reddish brown.The carapace is covered with numerous lumps. Central white depressed stripe. Legs covered with small tubercles. Associate with gorgonians.
Indo-West Pacific, Japan.
Phylum: Arthropoda Order: Decapoda Superfamily: Paguroide Size: to 0.6 cm
Staghorn Hermit Crabs are named for their hydroid and bryozoan shell (primarily the hydroid Janarua mirabilis) which resembles coral. Instead of changing shells like other hermit crabs, the Staghorn Hermit will tend to its live shell and maintain the "hole" in the coral to fit its body size.
Decorator crab. Decorator crabs are crabs of several different species, belonging to the superfamily Majoidea that use materials from their environment to hide from, or ward off, predators. They decorate themselves by sticking mostly sedentary animals and plants to their bodies as camouflage.