Halgerda orstomi is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Discodorididae.

[2][3] This species was described from a specimen collected at Vanuatu at depths of 235–251 m and three Paratypes from the same area.

Additional specimens included in the original description are from the Philippines and New Caledonia at depths of 92–120 m. This Discodorididae-related article is a stub.

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