I'm not sure about the exact dates when someone left or joined the band. If you happen to know it better feel free to contact me.
Lineup #1 (mid 1989)
albums from this lineup
Dave Wyndorf - vocals, guitar

Tim Cronin - vocals, drums

John McBain - bass

Forget About Life, I'm High On Dope

We're Stoned, What Are You Going To Do About It?

The Tab Remix

Lineup #2 (mid 1989 - 09/1990)
albums from this lineup
Dave Wyndorf - vocals, guitar

Tim Cronin - vocals, drums

John McBain - bass, guitar

Joe Calandra - bass

Jon Kleiman - drums

Monster Magnet [EP]
Lineup #3 (11/1990 - 5/1992)
albums from this lineup
Dave Wyndorf - vocals, guitar

John McBain - bass, guitar

Joe Calandra - bass

Jon Kleiman - drums

(Tim Cronin - visual effects)

Tab

Spine Of God

Lineup #4 (6/1992 - 9/1997)
albums from this lineup
Dave Wyndorf - vocals, guitar

Joe Calandra - bass

Jon Kleiman - drums

Ed Mundell - guitar

(Tim Cronin - visual effects)

Superjudge

Dopes To Infinity

Lineup #5 (12/1997 - 4/2003)
albums from this lineup
Dave Wyndorf - vocals, guitar

Joe Calandra - bass

Jon Kleiman - drums

Ed Mundell - guitar

Phil Caivano - guitar

(Tim Cronin - visual effects)

Powertrip

God Says No

Lineup #6 (05/2003 - 10/2003)
albums from this lineup
Dave Wyndorf - vocals, guitar

Ed Mundell - guitar

Phil Caivano - guitar

Jim Baglino - bass

Michael Wildwood - drums

(Josh Freas - drums on 'Master Of Light')

(Tim Cronin - visual effects)

Monolithic Baby!
Lineup #7 (12/2003 - 3/2005)
albums from this lineup
Dave Wyndorf - vocals, guitar

Ed Mundell - guitar

Phil Caivano - guitar

Jim Baglino - bass

Bob Pantella - drums

(Tim Cronin - visual effects)

none
Lineup #8 (4/2005 - 3/2008)
albums from this lineup
Dave Wyndorf - vocals, guitar

Ed Mundell - guitar

Jim Baglino - bass

Bob Pantella - drums

(Tim Cronin - visual effects)

4 - Way Diablo
Lineup #9 (4/2008 - 9/2010)
albums from this lineup
Dave Wyndorf - vocals, guitar

Ed Mundell - guitar

Phil Caivano - guitar

Jim Baglino - bass

Bob Pantella - drums

(Tim Cronin - visual effects)

Mastermind
Lineup #10 (10/2010 - 09/2013)
albums from this lineup
Dave Wyndorf - vocals, guitar

Garrett Sweeny - guitar

Phil Caivano - guitar

Bob Pantella - drums

Jim Baglino - bass

(Tim Cronin - visual effects)

none
Lineup #11 (mid 09/2013 - end 09/2013)
albums from this lineup
Dave Wyndorf - vocals

Garrett Sweeny - guitar

Phil Caivano - guitar, bass

Bob Pantella - drums

(Tim Cronin - visual effects)

Last Patrol

Milking The Stars: A Re-Imagining Of Last Patrol

Lineup #12 (since 10/2013)
albums from this lineup
Dave Wyndorf - vocals

Garrett Sweeny - guitar

Phil Caivano - guitar

Bob Pantella - Drums

Chris Kosnik - bass

(Tim Cronin - visual effects)

Cobras And Fire: The Mastermind Redux*

* I've put the release of that album under lineup #12 although Chris Kosnik is not mentioned as bass player on 'Cobras And Fire'