Sentences with phrase «ancient fish scales»

«Ancient fish scales and vertebrate teeth share an embryonic origin.»

In biology, one long - running debate has teeth: whether ancient fish scales moved into the mouth with the origin of jaws, or if the tooth had its own evolutionary inception.

Fossils show that ancient fish scales sported enamel long before this hard substance coated teeth

Not exact matches

But new analyses of fish fossils, as well as genetic analyses of a living fish species, suggest that this specialized material once served a very different function: to toughen some bones and scales of ancient fish.

The findings bolster earlier suggestions that ancient fish had enamel - armored scales, and they point to a new scenario for exactly how the substance ended up on teeth.

But the scales and skull bones of this ancient fish included some enamel.

Often called living fossils, these eel - like misfits have lungs and fleshy pectoral fins, bony plates and thick scales reminiscent of ancient fossil fish, and flag - like fins along their back that are unique.

Well - preserved fossils of an ancient fish called Psaroepis romeri reveal that this 20 - centimeter - long minipredator, which prowled the seas between 410 million and 415 million years ago, had enamel in its scales and its skull — but not its teeth, according to a paper by Ahlberg and colleagues in the 24 September issue of Nature.

Moreover, their findings suggest that ancient fishes had multiple layers of external armor that evolved into the differing scale types we see today.

«The scales of most fish that live today are very different from the ancient scales of early vertebrates,» says study author Dr Andrew Gillis from Cambridge's Department of Zoology and the Marine Biological Laboratory in Woods Hole.

Latest findings support the theory that teeth in the animal kingdom evolved from the jagged scales of ancient fish, the remnants of which can be seen today embedded in the skin of sharks and skate.

Trapped in an ancient, half - submerged city and desperate for supplies, you must explore the flooded streets in your simple fishing boat, and scale the ruined buildings that hold the promise of salvation.

In Carol Hepper's abstract painting «Percussion,» the canvas is stitched - together skins of sturgeons, ancient fish with thorny protrusions and bony plates instead of scales.