Rhinophores of a Halgerda batangas nudibranch in Pulau Bangka, Indonesia

Halgerda batangas is a dorid nudibranch species found in the tropical western Pacific. It reaches 4 cm in length, and is named after the province Batangas in the Philippines, whose shores house many sea slugs (including this one!).

Halgerda batangas Halgerda batangas is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Discodorididae. It is found in the tropical western Pacific. 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.