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Fig. 4 | BMC Ecology and Evolution

Fig. 4

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

Fig. 4

Opercula of Paramicrocornus ventricosus preserved as small shelly fossils from the Shuijingtuo Formation at Aijiahe section, Hubei Province. A ELI-AJH-SJT-9-10. Internal surface of a complete operculum showing triangular shape with well-preserved cardinal processes and clavicles. B ELI-AJH-SJT-9-O-001. Oblique lateral view of operculum, show the arcuate margin of the convex conical shield. C, E ELI-AJH-SJT-9-O-002. C Internal view showing a pair of strongly developed cardinal processes on a flat cardinal shield; E Lateral dorsal view showing the prominent internal structures. D, F ELI-AJH-SJT-9-O-004. Internal and oblique ventral views, showing the flat cardinal shield and the convex conical shield with the strong cardinal processes and clavicles

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BMC Ecology and Evolution

ISSN: 2730-7182

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