Prognathodes guyotensis (Yamamoto & Yameka, 1982), type locality Kyushu-Palau ridge off Okinawa, is recorded from a single specimen, 85 mm SL, from 202 m off the Maldive Islands. This constitutes the second record of the species and the first for the Indian Ocean. This butterflyfish was initially described in Chaetodon. It is here placed in Prognathodes Gill (type species, Chelmo aculeatus Poey), along with Chaetodon aya Jordan and allied species and C. modestus Schlegel.