An oversized hermit crab

Hermit crab (Latin scientific name: Paguridae) also known as "White House", "dry house", mainly to snail shell for the body, the largest diameter of the largest snail can reach more than 15 cm. Its shape is between shrimp and crab, most live in snail shells. Long body, divided head, chest and abdomen. The head and thorax have a breastplate, but do not cover the final thoracic segment. Cephalopthorax anterior narrow, calcified, posterior spread wider, horny or completely membranous, with a distinct cervical groove. Abdomen long, curved or straight, a few wide and short, often asymmetrical.