"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here’s what you’ll learn when you read this story: Is evolution a gradual process or a punctuated one, ...

Until recently, details about this group's most distant past have been elusive. But a UC Riverside-led team has now identified the oldest known ecdysozoan in the fossil record and the only one from ...

A representation of single-cell RNA sequencing data from two species of worms, C. elegans (left) and C. briggsae (right). Each point represents a single cell, arranged such that cells from the same ...

A genome sequence and single-cell atlas of a marine worm species point towards bursts of gene emergence, duplication and loss as the drivers of lineage-specific body traits. Usually about one ...

A body fossil of a thorny-headed worm (Acanthocephala) has been dated to the Jurassic period, about 165 million years ago. It has characteristics of both Acanthocephala and tiny animals called ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." “It may be doubted,” Darwin wrote, “if there are any other animals which have played such an important ...