Carolia (Parinomya) parinensis Olsson, 1928

DeVries, Thomas J., 2019, Early Paleogene brackish-water molluscs from the Caballas Formation of the East Pisco Basin (Southern Peru), Journal of Natural History 53 (25), pp. 1533-1584 : 1547-1548

Carolia (Parinomya) parinensis Olsson, 1928

( Figure 3 (c – e))

Carolia (Parinomya) parinensis Olsson 1928 , 20, pl. 3, figs. 1 – 4.

Remarks

Carolia peruviana Olsson, 1928 is found in northern Peru in the uppermost lower Eocene Chacra Formation, whereas C. parinensis , recognisable by the rasplike overlapping foliated layers of its ventral exterior margin, occurs rarely in the Chacra Formation but is commonly found in the underlying sandstones of the upper lower Eocene Pariñas Formation, a lithostratigraphic unit known for large shipworm-bored tree-trunks and cerithioid gastropods (Olsson 1928). In the Caballas Formation, C. parinensis occurs as external moulds on the attachment scars of Ostrea sechura .

Material

All specimens are external moulds on attachment scars of Ambigostrea sechura from locality B8769. UWBM 107569, H (22.9), on A. sechura ( UWBM 107559); UWBM 107570, H (15.3), on A. sechura ( UWBM 107560); MUSM INV 243, H (11.7), on A. sechura ( MUSM INV 237).

Occurrence

Lower Eocene, Pariñas and Chacra formations, Talara Basin, northern Peru; Lower Paleogene, Cuenca Member, Caballas Formation, East Pisco Basin, southern Peru.

Figures

Figure 3. Bivalves from the Caballas Formation. (a, b) Twig moulds on attachment scars of Ambigostrea sechura. (a) UWBM 107557, latex cast. (b) UWBM 107564, oyster length 11 mm. (c–e) Carolia (Parinomya) parinensis Olsson, 1928, on oyster attachment scars. (c) MUSM INV 243, latex cast of external mould on Ambigostrea sechura (MUSM INV 237), Carolia H 11.7 mm (top to bottom). (d) UWBM 107569, external mould on Ambigostrea sechura (UWBM 107559), Carolia H 22.9 mm (left to right). (e) UWBM 107570, external mould on Ambigostrea sechura (UWBM 107560), Carolia H 15.3 mm (left to right). (f–k) Incatina collinsae sp. nov., B8772. (f) UWBM 107637, holotype, L 13.7 mm. Right valve of pair, exterior. (g) UWBM 107637, left valve of pair, exterior. (h) UWBM 107637, paired valves, dorsal view. (i) UWBM 107638, paratype, L 10.0 mm. Right valve of pair. (j) UWBM 107639, paratype, L 16.4 mm. Right valve of pair. (k) UWBM 107638, left valve of pair. (l–q) Pleuriocardia (Incacardium) schneideri sp. nov. (l) UWBM 107575, paratype, B8769, L 13.7 mm. Paired valves, dorsal view, anterior to right. (m) UWBM 107574, paratype, B8770, L 25.0 mm. Right valve, exterior. (n) MUSM INV 247, paratype, B8772, L 21.1 mm. Right valve, exterior. (o) UWBM 107576, paratype, B8769, L 25.5 mm. External mould of left valve, oblique view. (p) MUSM INV 246, paratype, B8772, L 20.4 mm. External mould of right valve. (q) 107573, holotype, B8772, L 21.5 mm. Left valve, exterior. (r–t) Mulinoides plenicostatus sp. nov., UWBM 107571, holotype, B8769, L 28.1 mm. (r) Left valve, exterior. (s) Dorsal view, anterior on right. (t) Right valve, exterior.