Lima, BRUGUIERE, 1797

Charles L. Powell, Ii, Clites, Erica C. & Poust, Ashley W., 2019, Miocene marine macropaleontology of the fourth bore Caldecott Tunnel excavation, Berkeley Hills, Oakland, California, USA, PaleoBios 36, pp. 1-34 : 8

LIMA BRUGUIÉRE, 1797

FIG. 11

A single cast in sediment that measures about 8 mm high is questionably referred to the genus Lima based on its overall shape and broad, square radial ribs which curve toward the posterior end. The mold recovered is small with 13 broad, ribs slightly curving to the posterior end, that are square-sided with interspaces that are slightly less wide than the corresponding rib. The overall shape and sculpture is indicative of the genus Lima , which is known in California from only two species: Lima cf. Li. caribaea (d’Orbigny, 1853) from the late Miocene part of the “Imperial” Formation north of Palm Springs, Riverside County (Powell 1986) and Li. vedderi Moore, 1977 , which occurs in the Monterey Formation (Moore 1977), the Santa Margarita Sandstone ( Addicott et al. 1978), and unnamed Miocene strata on San Clemente Island, Los Angeles County, southern California (Moore 1977). It is easily distinguished from both these species by lacking sculpture on the ribs and its small size. Miodontiscus prolongatus Carpenter, 1864 ( Carditidae de Lamarck, 1809 ) somewhat resembles the cast, however; the shell shape is slightly different and Mi. prograongatus does not have as many ribs as the Caldecott Tunnel specimen.