The gnathostome (jawed vertebrate) crown group comprises two extant clades with contrasting character complements. Notably, Chondrichthyes (cartilaginous fish) lack the large dermal bones that ...

Add Yahoo as a preferred source to see more of our stories on Google. Fossils of the ancient armored fish Romundina gagnieri reveal that early vertebrates had teeth growing on dental plates rather ...

An international team of scientists has described a rare fossil site that is believed to be among the earliest evidence of different fish species using a common nursery — much like ones utilized by ...

Scientists estimate more than 99 per cent of all species that have ever existed on Earth are now extinct. Only a handful of them have been preserved as fossils. Fossils are ancient organisms’ ...

Editor's Note: This article first appeared at The Conversation. We humans use the euphemism for sex that “we like to get a leg over” but the first jawed vertebrates – the placoderms – they liked to ...

When an Australian scientist uncovered an ancient-looking placoderm skull in the 1960s, he thought he'd cracked the code on an evolutionary mystery. This so-called 'platypus fish,' scientists had ...

BANGKOK, ThailandBANGKOK, Thailand — The fossilized remains of two pregnant fish indicate that sex as we know it – fertilization of eggs inside a female – took place as much as 30 million years ...

An armored fish was about to become a mom some 380 million years ago. Though the primitive fish perished, its fossilized remains remarkably reveal an embryo and umbilical cord inside the soon-to-be ...

These days, all fish have teeth. The shapes of their teeth vary according to diet, ranging from the little pegs of goldfish ...