The wave itself is shaped as a UFO which consists of enemies, mainly UFO’s. It moves the same way as the Alien Mothership.
A part of the UFO consists of only one enemy type, which as follows:
Saucer - UFO chickens/UFO chicks
LED - Fester
Head - Enemies other than UFO’s (except gatling/laser)
Turret - Gatling/laser chick
Your post is ten times more annoying than the bump itself. Also, it’s not a bump if it’s within 14 days, some people can only check forums irregularly.