These armadillo-esque enemies from Eightman are creepy little bastards that open up revealing their meaty tendons, an upside down face and two big eyes. Perhaps equally as gross in this screenshot are the Totally-Not-A-Penis tubes with veins on them that pulsate.
Maybe the last gross enemy from Eightman is the boss before the last stage, which you may remember as a giant floating robot head but underneath the armor is a giant brain with a Predator mouth: