Paromoionchis tumidus is a species of small, air-breathing sea slug, a shell-less marine pulmonate gastropod mollusc in the family Onchidiidae.

[1] Paromoionchis tumidus is widely distributed in the Indo-Pacific from Japan in the north, to Hong Kong, Vietnam, the Philippines, Brunei Darussalam, Singapore, Peninsular Malaysia, the Andaman Islands, Indonesia, and Australia (New South Wales, Northern Territory, Queensland).

[1] The following names have been synonymized with Paromoionchis tumidus:[1]

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