Ornate Sapsucking Slug  (Ornate Elysia)

Elysia ornata is a sea slug in the Family Plakobranchidae (Order Sacoglossa). Its body is a translucent leaf-green in color with speckles of white and black. The parapodial margin is black with a yellow or orange submarginal band. The green rhinophores are usually black-tipped, but can also have orange bands (as shown).

It is also known as Ornate Leaf Slug. They feed on green algae (Bryopsis sp.), and reaches a length of 5cm.

This species is circumtropical and can be found both in the Caribbean and the Pacific Ocean.

Reference: [1] 

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Locality: Off the coast of Paradise island Beach Resort, Samal Island, Philippines (less than 10m depth)