World Register of Marine Species (WoRMS)
Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira da Rocha, R.; Swalla, B.J.; Turon, X. (2026). Ascidiacea World Database. Pyura lignosa Michaelsen, 1908. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=251277 on 2026-08-30
Michaelsen, W. (1908). Die Pyuriden (Halocynthiiden) des Naturhistorischen Museums zu Hamburg. Jahrb. Wiss. Anst., Hamburg. 25(2): 227-287.