New research reveals a 515-million-year-old mouth with rings of sharp teeth belonged to an ancient arthropod, giving clues to the ancestral origins of this feature.
Arthropod ancestor had the mouth of a penis worm
Water voles colonised Britain in two waves
Did English and Scottish water voles arrive in Britain at the same time, or did later English colonisers displace the earlier arrivals? New research unpicks data spanning 28,000 years.
Conor McKeever 