Ascidians collected during the 2013 Singapore Strait International Marine Biodiversity Workshop Author Lambert, Gretchen University of Washington Friday Harbor Laboratories, 620 University Road, Friday Harbor WA 98250, USA. Author Lee, Serina Siew-Chen 0000-0001-9326-0941 St John’s Island National Marine Laboratory, National University of Singapore, 18 Kent Ridge Road, Singapore 119227. & serina. lee @ nus. edu. sg; https: // orcid. org / 0000 - 0001 - 9326 - 0941 serina.lee@nus.edu.sg Author Teo, Serena Lay-Ming 0000-0002-3309-4715 St John’s Island National Marine Laboratory, National University of Singapore, 18 Kent Ridge Road, Singapore 119227. & tmsteolm @ nus. edu. sg; https: // orcid. org / 0000 - 0002 - 3309 - 4715 tmsteolm@nus.edu.sg text Zootaxa 2021 2021-02-18 4933 1 1 38 journal article 8063 10.11646/zootaxa.4933.1.1 8ebe62fc-b086-459e-b9fd-8a75ded875c7 1175-5326 4547842 56476487-ABC9-4C1C-A73F-D39E55DB9005 Polycarpa cf. captiosa #1208, pink juvenile. Peripharyngeal groove long, fairly narrow. Dorsal tubercle a long, narrow V. Not many primary oral tentacles, though including small ones about 27. Siphons dark, rest of body wall light. Dorsal ganglion very protuberant on outside of body as described by Tokioka (1950) . Endocarps numerous, scattered over entire body wall. Curve of gut short, closed, anus with many short rounded lobes. No gonads. #1242, juvenile, 23 mm long, 10 mm wide measured across siphons in tunic. Dorsal ganglion protuberant between siphons. Has numerous small white patches on surface of body as in #1208. Single row of elongate sausage shaped gonads, 10 on left side, 14 on right side. Two tiny reddish stolidobranchs attached to tunic, Polycarpa sp. and a Microcosmus sp. #4642, red juvenile on edge of rock, attached by entire left or ventral side; 18mm long x 9mm wide in tunic. Tunic thin, fragile, especially on attached left side. Atrial siphon in posterior third of body. Stomach long, furrowed, running anteroposteriorly. Series of small globular gonads developing in body wall.