Demondia, Addicott, 1965

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 : 13-14

DEMONDIA (?) ADDICOTT, 1965

FIG. 24

Although the specimens show reticulate or papillose sculpture, the aperture of the shells, which has a wellformed callus in Demondia , are not preserved making precise identification questionable.

UCMP 218821 and 218822 are two crushed, poorly preserved casts resembling the genus Demondia , and are most similarity to Dem. lincolnensis ( Anderson and Martin, 1914) . Demondia lincolnensis has been previously reported from the middle Miocene Astoria Formation of western Washington (Moore 1963) and Clatsop and Lincoln counties, Oregon ( Anderson and Martin 1914, Moore 1963). Unfortunately, the Caldecott Tunnel specimens are not well enough preserved to identify with confidence even to genus despite the resemblance to Dem. lincolnensis .

Figures

Figure 24. Demondia? sp. from UCMP locality IP13003. Hypotype (top), UCMP 218822. Hypotype (bottom), UCMP 218821.