James,
According to the species list by Guido Poppe at:
http://www.club.innet.be/~year0078/
these are the species in the genus Gaza:
Gaza daedata (Watson, 1878) Fiji
Gaza fischeri (Dall, 1889) Antilles
Gaza rathbuni (Dall, 1890) American Pacific
Gaza sericata (Kuroda, 1959) Indo Pacific
Gaza superba (Dall, 1881) American Atlantic
Gaza superba cubana (Clench & Aguayo, 1940) Cuba
Gaza watsoni (Dall, 1881) American Atlantic
You need to make a note of Poppe's site as it can answer a lot of
questions like this on the different families you get interested in.
Oh, according to Abbott the pronounciation is "gaw-zaw."
Tom Eichhorst in New Mexico, USA