dotilla myctiroides is a species of sand bubbler crab found on tropical shores and mud-flats of india, thailand, malaysia, indonesia, singapore and sri lanka. they breed throughout the year but activity peaks during the monsoons. this species builds a burrow, called an "igloo", in unstable sand as well as in well-drained and firm sand. in building the igloo, the crab excavates sand and forms it into spherical pellets. these pellets are used to form a circular wall and roof in the burrow. the resulting structure holds a small amount of air in addition to the crab itself.