“We have known for a decade or so that spiders evolved from arachnids that had tails, more than 315 million years ago.” ...

Sea spiders don't do anything by the book, and researchers have just gotten to the bottom of how they breathe.

“These things appear to be essentially spiders with tails!” Jason Bond, an evolutionary biologist at Auburn University in Alabama who was not involved the studies, tells Science. The specimen, which ...

Spider embryo with a loss of the waist region upon knockdown of the gene waistless. Hoechst staining with fluorescent stereomicroscopy. Credit must be given to the creator.