A–F Sinorachis baihu Wu & Chen, gen. and sp. nov., HBUMM08296-specimen 1, holotype. A left margin of mantle collar with the lobe arrowed B right margin of mantle collar C lateral dorsal view of buccal mass with an oral curtain (a sheet of curtain-like tissue on the most anterior of the buccal mass) arrowed D dorsal view of buccal mass with an oral curtain arrowed E shell-removed animal, showing three pigmentation patches near mantle margin F internal body wall of head, showing no obvious head gland between the ommatophore tentacles G HBUMM08296-specimen 2, paratype, mouth of ventral view with an oral curtain arrowed.