SIXX-Again Cheers man for creating this topic.
"I say, why split hairs? The 80s gave us two types of metal: Thrash metal and Glam(Pop) metal. All the other styles are just sub-genres of these two types of metal.
So where do you stand in the eternal debates? Pick one band, or pick them all, or cite one not listed, and tell us if you think they're Glam or Not. Why or why not?" - SIXX-Again
In reality there are no subgenres of 'Thrash Metal' or 'Glam Metal'. The easiest explanation is to show the hierarchical structure (using indentation) of the rock music genre. Alternative names of subgenres are seperated by a slash. Please note that I have only included the subgenres of interest, i.e. those that cover the 70s or 80s:
ROCK
....ALTERNATIVE ROCK / ALTERNATIVE MUSIC
........GOTHIC ROCK / GOTH ROCK / GOTH
........GRUNGE
....BLUES ROCK
....FUNK ROCK
........FUNK METAL
....GLAM ROCK / GLITTER ROCK
....HEAVY METAL / HARD ROCK / HEAVY ROCK
........EXTREME METAL
............BLACK METAL
............DEATH METAL
................MELODIC DEATH METAL
............GRINDCORE
............THRASH METAL
........GLAM METAL / HAIR METAL / POP METAL / SLEAZE METAL
........NU METAL / AGGRO METAL
........POWER METAL
........PROGRESSIVE METAL
........SPEED METAL
....PROGRESSIVE ROCK / PROG ROCK
....PSYCHEDELIC ROCK
....PUNK ROCK
........GLAM PUNK
........HARDCORE PUNK / HARDCORE
Many bands change musical direction during the course of their career so it is usually appropriate to never class them as one specific genre.
Here are some notes on how the important subgenres of rock came about. The year is placed after each band to construct the timeline of formation.
BLUES ROCK
Blues rock is an important subgenre of rock that encompasses many recording artists. The Rolling Stones 1962, The Animals 1962 and Eric Clapton 1962 were among the first to develop the blues rock sound. Other bands include Fleetwood Mac 1967, ZZ Top 1969, Gary Moore 1969 and The Black Crowes 1989. Blues rock influenced the style of many glam metal and hard rock bands of the 80s and early 90s.
HEAVY METAL / HARD ROCK / HEAVY ROCK
The roots of this subgenre can be traced to the 1960s and include blues, garage and psychedelic rock. Black Sabbath 1968, Deep Purple 1968 and Judas Priest 1968 were the first pioneers of heavy metal followed by the New Wave Of British Heavy Metal including Iron Maiden 1975. Heavy metal or simply 'metal' has many subgenres to categorise the results of the fusions between the multitude of musical styles it has adopted. Many bands fall into this classification including Led Zeppelin 1968, Aerosmith 1970, KISS 1973, AC/DC 1973, Van Halen 1972, Def Leppard 1977, Whitesnake 1977, Guns N'Roses 1985, Skid Row 1986 and Tesla 1984. Material produced before the sub-dividing of the metal genre is usually classed as 'classic metal' or 'traditional metal'.
GLAM ROCK / GLITTER ROCK
The roots of this subgenre date back to the early 1970s and include Gary Glitter 1960, Mud 1966, Slade 1966, Sweet 1968 and Roxy Music 1971. It must be noted that David Bowie's connection with this era is short lived during the use of his alter ego 'Ziggy Stardust'.
PUNK ROCK
The New Yorks Dolls 1971 are seen as the initiators of the Punk era. Bands include The Ramones 1974, The Stranglers 1974, The Sex Pistols 1975, The Runaways 1975 and The Clash 1976.
GOTHIC ROCK / GOTH ROCK / GOTH
The Cure 1976 are one of the early pioneers of this darker form of rock. Other bands include Siouxsie and the Banshees 1976, The Sisters Of Mercy 1980, The Cult 1983, Fields of the Nephilim 1984 and All About Eve 1984.
HARDCORE PUNK / HARDCORE
The pioneers of this subgenre were the The Dead Kennedys 1978. Bands include Discharge 1977, The Exploited 1979 and Agnostic Front 1980. Hardcore punk influenced the thrash metal scene. The phrase 'Mosh' comes from the way hardcore punk fans acted on the dance floor.
GLAM METAL / HAIR METAL / POP METAL / SLEAZE METAL
Glam metal has many names, all encompassing the same set of bands. Ratt 1976 and Motley Crue 1981 were among the first to pioneer the style of music that would later be classed as 'glam metal'. Other bands include Europe 1979, Kix 1978, Poison 1983, Warrant 1984 and Cinderella 1983 and many more...
SPEED METAL
Pioneered by Motorhead 1975, Judas Priest 1968 and the NWOBHM, you will find elements of speed metal in many thrash bands including Slayer 1981 and Anthrax 1981.
THRASH METAL
Influenced by the heavy metal band Venom 1979, many of the early thrash bands came from the San Francisco Bay Area and included Exodus 1980, Overkill 1980, Metallica 1981, Slayer 1981 and Anthrax 1981. Megadeth came a little later in 1983. Thrash metal had commercial success in the 80s and well into the 90s. It is claimed that Metallica initially played thrash metal to annoy the glam metal fans of the Sunset Strip.
BLACK METAL
The heavy metal band Venom 1979 helped influence this subgenre, which took its name from their second studio album "Black Metal" 1982. The first wave of bands included Bathory 1983 , Hellhammer 1982, Celtic Frost 1984 and Mayhem 1984. The second wave came in the late 80s and early 90s and mainly consisted of Norwegian bands including Darkthrone 1987, Burzum 1991, Emperor 1991, Immortal 1989 and Cradle of Filth 1991. Black metal is one of the most brutal sounding forms of the heavy metal genre. Cradle Of Filth helped promote the existence of black metal during the 90s, being very popular with teenie 'goth' girls.
DEATH METAL
The initial pioneer of death metal was the band Death 1983. Other bands include Morbid Angel 1984, Cannibal Corpse 1988, Carcass 1985, Obituary 1985, Sepultura 1984, At The Gates 1990, Dissection 1989, Dark Tranquillity 1989 and Fear Factory 1989. Death metal has grown to be one of the biggest forms of heavy metal and has spawned many of its own subgenres.
GRINDCORE
Napalm Death 1981 are credited as the initial innovators of this brutal subgenre of heavy metal, taking influences from hardcore punk. Bands include Extreme Noise Terror 1985, Terrorizer 1986 and Autopsy 1987.
FUNK METAL
Faith No More 1981 were one of the first bands to invent this subgenre. Bands include Bang Tango 1987, Extreme 1985, Electric Boys 1988, Living Colour 1984 and Mordred 1984.
The genres defined above were all legitimate, unique and had fan bases during the 70s and 80s.
To conclude, using the rock genre tree - all of the bands in the following list can be classed as either rock, heavy metal, hard rock or heavy rock. Glam metal is used to classify a specific range of 80s bands that roughly contain the definition you initially quoted from wikipedia. It is hard to find a band that is pure 'glam metal' as the whole genre was named in retrospect, plus many bands changed direction or were simply part of the glam metal scene in passing, take Aerosmith for example.
**WHITESNAKE
**GREAT WHITE
**TESLA
**QUEENSRYCHE
**DEF LEPPARD
**SKID ROW
**L.A.GUNS
**VAN HALEN
**AEROSMITH
**SCORPIONS
**OZZY
**GUNS N ROSES
Thorough as usual! Cheers to you, man! 
...That's an inside joke...).
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