Calliostoma bullatum (Philippi, 1844)
Rediscovered in 2010. Previously known only as fossils dating to the Middle Pleistocene at the latest.
Original scientific description:
Philippi, R. A. (1844). Enumeratio Molluscorum Siciliae. Vol. 2. Eduardi Anton, Halis Saxonum. 304 pp.
Hoffman, Leon et al. (2019). Last snails standing since the Early Pleistocene, a tale of Calliostomatidae (Gastropoda) living in deep-water coral habitats in the north-eastern Atlantic. Zootaxa 4613(1): 93-110. [Abstract]