Callistoplacidae Pilsbry, 1893

Family Callistoplacidae Pilsbry, 1893 View in CoL

Genus Callistochiton (Carpenter MS) Dall, 1879 View in CoL

Type species. Callistochiton palmulatus Carpenter MS, Dall, 1879 View in CoL , by monotypy.

Distribution. Callistochiton is known from the Oligocene to the Recent. The genus Callistochiton is widespread, occurring in cool to warm waters worldwide ( Kaas & Van Belle 1994). The sole NE Atlantic and Mediterranean species is C. ( Allerychiton) pachylasmae ( Monterosato, 1879) . The fossil record for Callistochiton is largely incomplete ( Puchalski et al. 2008), and the few records do not allow us to suggest a diversification scenario for the group. The fossil record extends back to the Oligocene deposits of Germany ( Janssen 1978; Dell’Angelo et al. 2011) and New Zealand ( Lee et al. 2014), the Miocene of Japan ( Itoigawa et al. 1981) and Tanzania, E. Africa ( Davis 1954), the Miocene-Pliocene of California, U.S.A. ( Vendrasco et al. 2012, 2022 and references therein), the Pliocene-Pleistocene of S. Italy ( Dell’Angelo et al. 1998b), and the Pleistocene (interglacial deposits) of California, U.S.A. ( Muhs et al. 2002).

Remarks. The main morphological characters of the Callistochiton spp . considered in the present study are reported in Tab. 13333.

observations).