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Fig. 2 | BMC Ecology and Evolution

Fig. 2

From: Hyolithid-like hyoliths without helens from the early Cambrian of South China, and their implications for the evolution of hyoliths

Fig. 2

Paramicrocornus ventricosus preserved with some structures on the operculum from the Chengjiang Biota. A ELI-H-EJ186A. Complete specimens preserved in three-dimensions in dorsal view. B ELI-H-EJ186A. One partly buried individual covered by another animal, showing the deep sulcus between conical and cardinal shields filled with mud, and a circular pit on the summit of the conical shield. C ELI-H-EJ186B. Enlarged view of the counterpart of B. D SJZ-242. Conch with sharp apex and short ligula on venter. E, F ELI-H-EJ186B. E Articulated specimen showing the clavicles on operculum interior. F Close-up view of blade-like clavicles with parallel ridges representing clavicle rods. H Reconstruction of P. ventricosus. G SJZ-B08-509B.I Individual of P. ventricosus with clavicles on the internal surface of operculum marked by arrows. I SJZ-B08-509B. Three-dimensionally preserved specimen in dorsal view with triangular operculum. J SJZ-B08-509A. Aggregation of P. ventricosus. K SJZ-B04-033. Two conchs of P. ventricosus with sharp apex, L SJZ-B04-033. On articulated specimen showing the very sharp apex with a linear internal tube towards the pointed conch apex

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