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Temporal range: Middle Ordovician–Permian[1][2]
Conical platyceratid gastropod (Palaeocapulus acutirostre) attached to a crinoid (Mississippian of Ohio)
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Superfamily: Platyceratoidea
Hall, 1879
Family: Platyceratidae
Hall, 1879

Platyceratidae is an extinct family of Paleozoic sea snails, marine gastropod mollusks. This family may belong in the Patellogastropoda or the Neritimorpha.[2] The platyceratid gastropods are known for the complex symbiotic relationships they had with crinoids.[3]

This is the only family in the superfamily Platyceratoidea.



  1. ^ Wagner, P. J. (2004). "Phylogenetic Relationships of the Earliest Anisostrophically Coiled Gastropods". Smithsonian Contributions to Paleobiology. 88: 1–152. doi:10.5479/si.00810266.88.1.[permanent dead link]
  2. ^ a b Sutton, M. D.; Briggs, D. E. G.; Siveter, D. J.; Siveter, D. J. (2006). "Fossilized soft tissues in a Silurian platyceratid gastropod". Proceedings of the Royal Society B: Biological Sciences. 273 (1590): 1039. doi:10.1098/rspb.2005.3403. PMC 1560260. PMID 16600878.
  3. ^ Baumiller, T. K. (2003). "Evaluating the interaction between platyceratid gastropods and crinoids; a cost-benefit approach". Palaeogeography, Palaeoclimatology, Palaeoecology. 201 (3–4): 199–209. doi:10.1016/S0031-0182(03)00625-4.
Cross-section of a Lower Carboniferous crinoid with an in situ parasitic platyceratid gastropod.