World Register of Marine Species (WoRMS)
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Huitfeld-Kaas, H. (1896). Synascidiae. Norske Nordhavs-Exped. 7(3/23): 1-27.
Verrill, A. E. (1871). Descriptions of some imperfectly known and new ascidians from New England. American Journal of Science series 3. 1: 54-58, 93-100, 211-212, 288-294, 443-446.