Lembeh Strait (Indonesia: Selat Lembeh) is a narrow stretch of water between Sulawesi and Lembeh Island (Pulau Lembeh), Indonesia. Lembeh Strait is world-known for its extremely high density of rare and unusual marine life, in particular crabs.
Orang-utan Crab (Achaeus japonicus) is a crab of the family spider crabs (or decorator crabs) which can be observed in tropical waters of the central Indo-Pacific.
With a carapace of only about 2 centimetres or 0.8 inches in diameter, it has relatively long arms, which are thickly covered with fine hairs, red or reddish brown in colour, and often laden with small bits of debris for further camouflage.
Porcelain crabs are small, usually with body widths less than 15 millimetres, they share the general body plan of a squat lobster, but their bodies are more compact and flattened, an adaptation for living and hiding under rocks.
Porcelain crabs are quite fragile and often shed their limbs to escape predators, hence their name.
Hermit crabs have adapted to occupy empty scavenged mollusc shells to protect their fragile exoskeletons. There are over 800 species of hermit crab, most of which possess an asymmetric abdomen concealed by a snug-fitting shell.
Hermit crabs must occupy shelter produced by other organisms, or risk being defenseless. Due to the pollution in the ocean, some hermit crabs even use man-made garbage as their shelters.
