A deep-sea anemone specimen (specimen No. HK74SY85) was captured by the robotic arm of the HOV Shenhaiyongshi (TS0704 voyage, SY85 sneak) carried by the research ship TanSuoyihao, on the 1st of June, 2018, at one site (113.737502°E, 18.266465°N) in the Xisha Trough at a depth of c. 3,230 m (Supplementary Figure S1). Once reaching the mothership deck, a small amount of tissue from oral, pedal, and column areas was moved out and flash-frozen in liquid nitrogen, conserved at -80°C. The remained specimen was fixed in 40 % formaldehyde solution and stored in the collection of the Institute of Deep-sea Science and Engineering, CAS, Sanya, China. In situ, the deep-sea anemone solitary, attached to the mudflat. Body sub-cylindrical, orange-brown, colored by dark speckles. Pedal disc slight expansion. Oral disc and tentacles remarkably expanded, larger than those of middle and proximal columns. Tentacles strong and dense numbers, tapered. In preservation, oral disc, tentacles, and column contracted, sub-cylindrical, height about 15 cm, the diameter of oral disc 21 cm and pedal disc 14 cm. Column divisible into scapus and scapulus: the former provided with a layer of cuticle and large tubercles; the latter short, with smaller tubercles. Tubercles in the whole column, irregularly arranged in scapulus, and regularly arranged in lines in scapus. No cinclides. Internal column bear acontia.