A genus of medium-siced species known from the Central Indo-Pacific realm, the Western Indo-Pacific realm, and the Eastern Indo-Pacific realm. The earliest records are from the Miocene of Vanuatu and Fiji.
The type species is Porphyria amethystina Röding, 1798 (see below).
The following extant species are recognised:
Widely distributed. Mainly Central Indo-Pacific and Eastern Indo-Pacific
RV 6971. Solomon Islands, Tulagi Island; in sand at night, 0.6 m. Scale bar is 1 cm.
RV 1384. Seychelles, Mahe, in traps, crabbed, depth 25 m. Scale bar is 1 cm.
Widely distributed. Mainly Central Indo-Pacific and Western Indo-Pacific
RV 3402a. Madagascar, Toliara (Tulear), from fishermen, August 2012. Scale bar is 1 cm.
Andaman Sea, Philippines, Solomon Islands, Papua New Guinea
RV 7103. Papua New Guinea, New Britain, Rabaul, depth 28.5 m, in sand. Scale bar is 1 cm.