Lissoclinum midui was collected from Lyudao (Green Island), Taiwan. This is the first record outside of the type locality, Kumejima Island (Ryukyu Archipelago, Japan), of this species. The colonies in Lyudao were found on non-geniculate coraline algae covering the coral limestones in the reef crest (0.5–1 m deep). They were not rare at the collection sites, and it is uncertain why this species has only been recorded in the two sites in Taiwan–Ryukyus. It may be that the shallow, wave-exposed reef crest is a poorly investigated habitat for small benthic invertebrates.