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Temporal range: Devonian–Holocene
Entobia Modern.jpg
Modern Entobia borings in an oyster shell
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Subclass: Heteroscleromorpha
Order: Clionaida
Family: Clionaidae
Genus: Entobia
Bromley, 1970
Entobia and encrusters on a quahog shell, North Carolina.

Entobia is a trace fossil in a hard substrate (typically a shell, rock or hardground made of calcium carbonate) formed by sponges as a branching network of galleries, often with regular enlargements termed chambers. Apertural canals connect the outer surface of the substrate to the chambers and galleries so the sponge can channel water through its tissues for filter feeding (Bromley, 1970). The fossil ranges from the Devonian to the Recent (Taylor and Wilson, 2003; Tapanila, 2006).


  • Bromley, R.G. (1970). "Borings as trace fossils and Entobia cretacea Portlock, as an example". Geological Journal, Special Issue. 3: 49–90. 
  • Tapanila, L. (2006). "Devonian Entobia borings from Nevada, with a revision of Topsentopsis". Journal of Paleontology. 80: 760–767. doi:10.1666/0022-3360(2006)80[760:DEBFNW]2.0.CO;2. 
  • Taylor, P.D., Wilson. M.A. (2003). "Palaeoecology and evolution of marine hard substrate communities". Earth-Science Reviews. 62: 1–103. doi:10.1016/S0012-8252(02)00131-9. 

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Entobia from the Prairie Bluff Chalk Formation (Maastrichtian, Upper Cretaceous) of Starkville, Mississippi. Preserved as a cast of the excavations.