Cydalise et le Chèvre-pied Cydalise et le Chèvre-pied Cydalise et le chèvre-pied ("Cydalise and the goat-foot" or "Cydalise and the satyr") is a two-act ballet originally choreographed by Léo Staats to a score by Gabriel Pierné. The libretto was written by Gaston Arman de Caillavet and Robert de Flers, based on Remy de Gourmont's "Lettre d'un satyre". Though it was composed between 1914 and 14 February 1915, its Paris Opera premiere was delayed due to the conditions of World War I until 15 January 1923. The use of the French term "chèvre-pied" (goat foot) to refer to the satyr is distinct to this composition.
Supernumerary body part considered to have lost much or all of their original function through evolution. These body parts can be classed as additional to the required functioning of the body. In human anatomy the vermiform appendix is sometimes classed as a vestigial remnant. Prosthesis is an artificial extension that replaces a body part, and cybernetics is the study of computer technology in relation to organisms which can include replacement or additional body parts. Body integrity identity disorder (BIID) is a psychiatric disorder in which a person thinks that they have one or more additional limbs than they should, despite having two arms