The yellow gestroi isopod, or Armadillidium gestroi "Zinger" or "High Yellow," is a large, popular isopod known for its striking black body with bright, contrasting yellow spots, often in triangular or wedge shapes. These slow-moving isopods are easy to care for, making them a favorite for beginners, and a special "Zinger" line has been selectively bred for even more intense yellow or white markings.