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There is no clear distinction between "terrestrial", "semi-terrestrial", and "aquatic" crabs. Rather, there is a continuum of terrestriality displayed among the true crabs, although even the most land-adapted crabs must still return to water to release their eggs. Some species of terrestrial crabs can be found many kilometres from the sea, but have to complete annual migrations to the sea.] For example, following the Indian Ocean monsoon, the Christmas Island red crab (Gecarcoidea natalis) migrates en masse, forming a "living carpet" of crabs. The crabs can travel up to 1.46 km (0.91 mi) in a day, and up to 4 km (2.5 mi) in total.
Terrestrial crabs have often evolved from freshwater crabs, since the physiological changes needed for living in fresh water are pre-adaptations for terrestrial living.On some oceanic islands, terrestrial crabs occupy the top of the energy pyramid.
Families of Freshwater Crabs from Asia
I had no idea what this was but I was captivated by its steel blue jacket. Then 668 neighbour of the beast commented it was probably a staphylinid beetle. Google took me to a site with a similar insect and the information that "It is an active predator of several crop-damaging insects and occurs in warm tropical climates. The insect breeds in wet rotting leaves and soil. The beetle is drawn to light fixtures and candles at night. The beetle does not bite or sting, but when crushed against the skin it releases a potent toxin known as pederin that results in itching, burning, erythema and oozing 12-48 hours later." (!)