Searle (1985) John Marshall (1987) Larry LaLonde (1987–1989) Mark Strausberg (1989–1990) Eric Lagosh (1989) Steve Marcus (1992–1995) Eric Meyer (2007) Aaron Knudson (2015) Bass (incomplete) Alvin Petty (1976–1977) Les Claypool (1978–1979) (1980–1981) (1986–1989) Chris Olsen (1979, 1980) Geno Gilson (1983–1986) Larry LaLonde (1987–1989) Adam Gates (1988) Vern McElroy (1989–1990) Evan Barnes (1992–1995) Danny (2008–2014) Harald Oimoen (2013–2017) Drums (incomplete) Bret Hern (1979–1983) R.I.P. Bill Ticson (1983) Mike Miner (1983–1988) Wes Anderson (1988–1989) Albert Simmons (1992–1995) Steve Johnson (2008–2010) Robert Nystrom (2010–2014) Bret Hern (2014) Erik "Cire" Cruze (2014–2019) Brian Schwartz – drums (September 2019–2020) Liz Say – drums (selected live shows) Keyboards Ben Heveroh (1982–1983) References External links Official website American progressive metal musical groups Thrash metal musical groups from California Musical groups from San Francisco Primus (band) Musical groups established in 1979 Musical groups disestablished in 1989 American musical trios Les Claypool