The new velvetfish Cocotropus aurantius is described on the basis of a single specimen (17.1 mm standard length) collected off Nagannu Island, Kerama Islands, Japan, at a depth of ca. 50 m. An individual of the new species has also been photographed off Izu Peninsula, Japan. The species is characterized by XII, 8 dorsal-fin rays, II, 6 anal-fin rays, 13 pectoral-fin rays, 7 segmented lower caudal-fin rays, 26 vertebrae, an interneural space between the 7th and 8th vertebrae lacking dorsal-fin spine proximal pterygiophores, the 1st–4th dorsal-fin spines situated anterior to the 3rd neural spine, 5 preopercular spines, vomerine teeth absent, the 2nd mandibular pore on each side fused, and the head, body and fins somewhat orange when fresh (preserved condition creamy-white), and with numerous small scattered brownish blotches and streaks.

新的天鹅绒鱼Cocotropus aurantius根据在日本喀拉马群岛纳甘努岛（Nagannu Island）上采集的单个标本（标准长度为17.1毫米），深度约为5,000毫米对标本进行了描述。50公尺。日本伊豆半岛附近还拍摄了一个新物种的个体。该物种的特征是XII，8条背鳍射线，II，6条肛门鳍射线，13条胸鳍射线，7条分段的下尾鳍射线，26块椎骨，第7和第8椎骨之间的神经间隙，缺乏背鳍。鳍脊柱近端翼状phor肉，位于第三神经脊柱前的第1至第4背鳍棘，5个术前棘，无前齿，两边的第2下颌骨孔融合在一起，新鲜时头，身体和鳍略呈橙色（保存状态为乳白色），并有许多小的分散的褐色斑点和条纹。