Peanut worms of the phylum Sipuncula from the Nha Trang Bay (South China Sea) with a key to species Author Adrianov, Andrey V. Author Maiorova, Anastassya S. text Zootaxa 2012 3166 41 58 journal article 45619 10.5281/zenodo.279772 32627594-388c-40b3-8481-0b241b850847 1175-5326 279772 Nephasoma pellucidum (Keferstein, 1865) ( Fig. 2 A–B ) Material. Nha Trang Bay: Hon Rock, 10–15 m depth, coral rubble, 10 specimens ; Mung Island, 7–15 m depth, sand, 1 specimen . Description. Trunk spindle-shaped, 20–25 mm long and 3–4 mm wide; introvert shorter than trunk, with scattered hooks of two types – small, about 50 μm, and large, up to 300 μm in height. Tentacular crown with 20–30 whitish transparent tentacles. Trunk is translucent, pale tan, with large uniformly distributed digitiform papillae. Body wall with continuous muscle layers; two retractor muscles originate in the mid trunk. Gut with 25–30 loops; spindle muscle not attached posteriorly; contractile vessel with vesicular swellings. Nephridia free, about 35–40% of trunk length, nephridiopores adjacent to anus. Discussion. This is the only species of Nephasoma that is common in shallow waters of the Indo-West Pacific. In the West Pacific, it has been found inhabiting sandy bottoms and dead corals from Australia and Indonesia to southern Japan .