With their suction cup mouths filled with concentric circles of pointy teeth that suck the body fluid of unsuspecting victims, lampreys may seem like the stuff of horror movies. (sciencemag.org)
Looking a bit like a dolphin, but with a long slim snout filled with pointy teeth, one species of ichthyosaur was practically invisible in the murky depths of Jurassic seas, thanks to dark pigmentation that covered its entire body. (sciencemag.org)