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Thysanozoon nigropapillosum can reach a length of 5-8 cm. The upper surface of the body is black and velvety with white edges and shows dorsal rounded papillae tipped with yellow-orange. This species is frequently confused with nudibranchs.
This species is widespread in the Indo-Pacific.
Thysanozoon nigropapillosum is quite common along the external reef.