 It is difficult to be sure of the date of either Hicetas or Ecphantus. Since, however, both seem to be influenced by Philolaus’ idea of a moving earth and since Ecphantus appears to be developing the atomism of Democritus, it is usually assumed that they belong to the first half of the fourth century (Guthrie 1962, 325–329; Zhmud 2012a, 130). Hicetas does not appear in Iamblichus’ catalogue. There is an Ecphantus in the catalogue, but he is listed under Croton rather than Syracuse, so it cannot be certain whether he is the Ecphantus described in the doxography.