At the gain of the game, each player starts with one population of a species of prehistoric amphibian—e.g. Ichthyostega, Tulerpeton, and Acanthostega.
These bones may have been derived from the ventral scales found in animals like rhipidistians, labyrinthodonts, and Acanthostega, and may be related to ventral elements of turtle plastrons.
The basic form of the vertebrate foot has five toes, however some animals will have evolved fewer than this, and some early tetrapods had more; Acanthostega had eight toes.