Phyllidiella nigra

Phyllidiella nigra (commonly known as Black phyllid nudibranch)

Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superfamily:	Phyllidioidea
Family:	Phyllidiidae
Genus:	Phyllidiella Bergh, 1869[1]

Where seen?

This black nudibranch with pink bumps is often seen on our Southern shores, near coral rubble and reefs.

Features:

4-5 cm long. Body long, hard with bumps (called tubercles) that are evenly distributed throughout its body (not clustered in groups or in ridges along the body). The bumps are tall and rounded, are pink to red near the tips, but black where they join the body. The short rhinophores are black. When disturbed, it secretes a milky substance. The broad foot on the underside is bluish and does not have a line along the centre.

Credit: http://www.wildsingapore.com/wildfacts/mollusca/slugs/nudibranchia/nigra.htm