Chinese Sea Krait

The black-banded sea krait (Laticauda semifasciata), also known commonly as the Chinese sea snake or erabu, is a largely amphibious species of extremely venomous marine reptile in the subfamily Laticaudinae, family Elapidae (cobras, mambas, coralsnakes and their kin). It is found in much of the western Pacific Ocean and some of the Sea of Japan. In Japan, it is known as erabu umi hebi (ja:エラブウミヘビ, 'erabu sea snake'); in Okinawa, it is known simply as irabu.

This sea krait frequents coral reef habitats, where it can explore tight spaces for prey, as it has a short head, thick trunk, and no easily discernible neck. The tail is simply extended skin, spread wide like a fin, and unsupported by any bony projections from the vertebral column. The stomach is comparatively wide. Massing together near the shore, it breeds between narrow cracks in the reef and in caves. It is a nocturnal snake, rarely seen during the day. It breathes air; so it breaks the surface at least once every six hours.