Figure 2. Bivalves from the Caballas Formation. (a–c) Incanopsis fastigiata sp. nov. (a) UWBM 107752, holotype, B8772, L 17.4 mm. Left valve, exterior. (b) UWBM 107752, cardinal area. (c) UWBM 107753, paratype, B8769, L 14.7 mm. Right valve, broken. (d, e) Brachidontes euglyphus (Woods, 1922). UWBM 107551, B8772, L 30.0 mm. Right valve, mould in part. (d) Exterior. (e) Exterior, anterior view. (f–s) Ambigostrea sechura (Olsson, 1944). (f) MUSM INV 235, B8769, L 55.6 mm. Left valve, exterior. (g) UWBM 107558, B8769, L 40.6 mm. Paired valves, posterior view. (h) MUSM INV 235, interior. (i) UWBM 107562, B8770, L 16.5 mm. Left valve, exterior. (j) UWBM 107562, right valve, exterior. (k) UWBM 107563, B8770, L 16.7 mm. Right valve, exterior. (l) UWBM 107568, B8772, L 26.0 mm. Paired valves, right valve resting on left valve. (m) UWBM 107554, B8769, L 76.8 mm. Left valve, interior. (n) MUSM INV 241, B8772, L 15.2 mm. Paired valves, right valve resting on left valve; with attached oyster spat. (o) UWBM 107565, B8772, L 24.6 mm. Left valve, interior. (p) UWBM 107555, B8769, L 52.2 mm. Right valve, exterior. (q) UWBM 107555, interior. (r) MUSM INV 238, B8769, L 29.7 mm. Left valve, interior. (s) MUSM INV 236, B8769, H 29.1 mm. Left valve, exterior, with twig mould in attachment scar. (t, u) undescribed gryphaeid oyster, Los Choros Member of the Paracas Formation, B8768. (t) UWBM 107642, H 49.0 mm. Right valve, interior showing vermiculate dorsoposterior margin. (u) UWBM 107641, H 65.2 mm (left to right in photo). Left valve, anterior view.

Published as part of DeVries, Thomas J., 2019, Early Paleogene brackish-water molluscs from the Caballas Formation of the East Pisco Basin (Southern Peru), pp. 1533-1584 in Journal of Natural History 53 (25) on page 1539, DOI: 10.1080/00222933.2018.1524032, http://zenodo.org/record/3670229