VENERIDAE RAFINESQUE, 1815

Charles L. Powell, Ii, Clites, Erica C. & Poust, Ashley W., 2022, Miocene marine macropaleontology of the fourth bore Caldecott Tunnel excavation, Berkeley Hills, Oakland, California, USA, PaleoBios 36, pp. 1-34 : 12

VENERIDAE RAFINESQUE, 1815

FIG. 21

UCMP 410418 is a single small specimen that shows an overall oval shell outline with the umbo positioned at about a third of the shell’s length. The umbo overhangs the dorso-anterior margin which is short and steeply inclined. The dorso-posterior margin broadly arches away from the umbo and is partially hidden. The ventral margin is broadly rounded from the anterior to the posterior. A fragment of the shell is present posterior of the umbo and appears moderately thick with strong concentric ribs. The cast shows that these ribs were co-marginal and moderately evenly spaced. These features and the shell outline matches well with some members of the family Veneridae , in particular the genus Clementia Gray, 1842 , which is well known from the Miocene and possibly into the Pliocene of the West Coast (Woodring 1927). However, the specimen is not well enough preserved for a precise identification.

Figures

Figure 21. Veneridae, indeterminate from the Tsm Caldecott Tunnel fauna, right valve (left), left valve (right). Hypotype from UCMP locality IP13004, UCMP 410418.