
Photo: Robin White · CC BY 4.0 (May be cropped or resized)
Hydrophis ornatus
Range
Coasts from the Persian Gulf and India (including Sri Lanka) through Southeast Asia to northern Australia and the western Pacific
The ornate sea snake, or ornate reef sea snake, is a venomous sea snake with a wide coastal range. It has been recorded off the Andaman and Nicobar Islands, India, Sri Lanka, Bangladesh, Southeast Asia, southern China, Japan and Indonesia, and through the western Pacific to Papua New Guinea and northern Australia (Wikipedia, general species account).
Nationally Least Concern (Sri Lanka National Red List 2012).