Remarks: 1. Another close species, T. andersoni ROSENBLATT & COHEN, 1986, was described from Galapagos Rift, but its synonymy with T. cerberus is debated. 2. A new species of Thermarces was found at East Pacific Rise: 9°N, showing strong morphological and color differences. It is being described elsewhere (M. Biscoito & M. Segonzac, unpublished data).