The tiny 'backward' brain of an ancient sea creature hints that spider ancestors might have gotten their start in the ocean.

However, the arthropods, such as insects and crustaceans, and their distant relatives called nematodes (round worms), do it differently. These groups diverged from the rest of the animal kingdom ...

Examples of arthropods include insects, arachnids (spiders), and crustaceans. Insects and their relatives are not all bad actors. Most are crucial to a ... It is estimated that only about 3% of ...