four-eyed beetle cross-section
A histological section of a four-eyed beetle shows regular (bottom right inset) and ectopic (upper right inset) compound eyes. (Photo credit: Eduardo Zattara, Ph.D.)
A histological section of a four-eyed beetle shows regular (bottom right inset) and ectopic (upper right inset) compound eyes. (Photo credit: Eduardo Zattara, Ph.D.)