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Halgerda batangas is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Discodorididae. This animal is one of a group of mainly white species of Halgerda with orange markings. It is characterized by a network of fine, solid, red-orange lines on the mantle. It has a white band around the mantle containing low rounded orange-capped tubercles. The mantle tubercles range in size from small rounded bumps to tall, prominent structures.
This species is found in the tropical western Pacific, including: Indonesia, Philippines, Solomon Islands, Mabul, New Britain, the Davao Gulf, Malaysia, Papua New Guinea, Sulawesi, Great Barrier Reef and Taiwan.