Article: Decapods in ammonite shells: examples of inquilinism from the Jurassic of England and Germany

Inquilinism is that association in which one organism lives within another, using the host as a place of refuge. Four specimens are described from the Jurassic of England and Germany which illustrates ammonite inquilinism by decapods. The inquiline use of ammonite shells in the geological record, and its ecological and taphonomical implications are discussed.