Phidiana militaris, a kind of nudibranch common in Indian waters and on seashores. It is often found near colonies of Zoanthus (a relative of corals), as seen here. This one was about 2cm long, but they can grow to at least 4cm.
Canon 760D, Canon 100mm Macro USM
SS 1/200
Av 14
ISO 400
Built-in flash
C&C welcome.
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