CODAKIINAE KOROBOKOV, 1954

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 : 9

CODAKIINAE KOROBOKOV, 1954

FIG. 14

UCMP 218741 is a single specimen that may represent a new genus and species within the subfamily Codakiinae . The combination of its diamond-shaped outline with slightly inflated valve, and a strong posterior radial sulcus that extends to the posterior ventral margin serve to separate this species from West Coast species of Lucinoma , although these features could be an artifact of preservation. Sculpture consists of numerous, slightly irregularly-spaced, co-marginal lamellae, with wide to moderate interspaces. The lunule, ligament, and escutcheon were not observed. This species appears most similar to the western Atlantic species L. atlantis (McLean, 1936) , L. “atlantis ” of Taylor and Glover (2017, figs.39–43) and L. sp. of Taylor and Glover (2017, fig. 51–52) differing from them in being taller than wide and in having a pointed ventral margin. This species is also somewhat similar to Scabrilucina (Taylor and Glover 2013) , a modern genus from the southwest Pacific but lacks an anterior sulcus and the ventral margin is angular not rounded. It is here referred to aff. Lucinoma until additional specimens can be found and described in detail.

Figures

Figure 14.aff. Lucinoma? n. sp. from the Tsm Caldecott Tunnel fauna, left valve. Hypotype from UCMP locality IP13005, UCMP 218741.