Gnathichnus
Appearance
Gnathichnus is a trace fossil on a hard substrate (typically a shell, rock or hardground made of calcium carbonate) formed by regular echinoids as they scraped the surface with their five-toothed Aristotle's Lantern feeding structures (Bromley, 1975).
References
- Bromley, R.G. (1975). "Comparative analysis of fossil and recent echinoid bioerosion". Palaeontology. 18: 725–739.