The horsetail beetle is a complete worm of the Ankylosaurus or other horsetail animals in the Crustaceae family. Its body is large, about 120 millimeters long and 7 millimeters wide; Smooth surface, cylindrical shape, composed entirely of multiple components; The back of the body is black brown, the back edge is light brown, and the covered part of the front edge is light yellow; There are many single eyes on both sides of the head, which combine into two clusters and resemble compound eyes; The antennae are about five millimeters long and hairy; Male insects are smaller than female insects.