Xilien Saucer
Emerging from small compartments hidden in the scenery until the player approaches, the Xilien Saucers will simply fly through the air around the player, attempting to slam their ships in the Godzilla or Mothra in a kamikaze run.
From: Invasion of Astro-Monster (1965)

Laser Tower*
Appearing first as the husk of a abandoned building, the gun won't actually be visible until the player approaches the structure and the weapon is revealed. The tower charges its blasts for a short while before discharging a horizontal strafing shot.
From: N/A

Battering Tower*
First taking on the appearance of a unoccupied structure, the Battering Tower will reveal its multi-armed, rotating, weapon when the player moves within range. The tower lacks any ranged weapons, however, and will simply try to ward off the player by striking them when they move in too close.
From: N/A

Grinder Tower*
Identical to the Battering Tower in terms of the function, the only noticeable deference is the instruments which are being used to slowly damage Godzilla or Mothra should they come close enough.
From: N/A

Ramming Tower*
Different from other weapon equipped towers on this level, the Ramming Tower's instruments can actually extend great distances to try and strike Godzilla or Mothra.
From: N/A

Battle Station*
Identical to the Hover Battle Station, except this one is mounted into a nearby building. The Battle Station will fire long beams at the player horizontally, or vertically if Mothra tries to fly over or beneath the hovering structure.
From: N/A

Attack Ship*
The slow moving Attack Ships of the Xilien force, these crafts will fly in at a reasonable speed toward the player and then will slow to a crawl as they unleash streams of blasts against the player before trying to flee to avoid their own destruction.
From: N/A

Blast Discharger*
Located at the bottom of the Ruins stages, the Blast Dischargers will start to flash before unleashing several blasts which will fly in all directions.
From: N/A