Beck 1992. Two new neritacean limpets (Gastropoda: Prosobranchia: Neritacea: Phenacolepadidae) from active hydrothermal vents at Hydrothermal Field 1 'Wienerwald' in the Manus Back-Arc Basin (Bismarck Sea, Papua-New Guinea). Annalen des Naturhistorischen Museums in Wien Serie B Botanik und Zoologie, 93, 30 August 1992: 259-275