Chambered Nautilus, 'Living Fossil' Depleted by International Shell Trade, Moves Toward Endangered Species Act Protection. OAKLAND, Calif.—The National Marine Fisheries Service today announced it will ...

Like its fellow marine dweller the horseshoe crab, the chambered nautilus hasn't changed much in 400 million years. The pair are actually considered living fossils. The nautilus dominated the ...

Like its fellow marine dweller the horseshoe crab, the chambered nautilus hasn’t changed much in 400 million years. The pair are actually considered living fossils. The nautilus dominated the ...

Chambered Nautilus Receives Much-needed International Protection . Ancient Mollusk, in Demand for Beautiful Shells, Threatened by Trade. JOHANNESBURG, South Africa— Nations around the world today ...

A Living Fossil Returns Allonautilus scrobiculatus, spotted again after 30 years. ... Illegal fishing and “mining” operations for nautilus shells are threatening their populations.

Squires had a collection of nautiloid fossils from 50-million-year-old rocks in Washington State, and in 1988 he published a paper describing these as the oldest chambered nautilus fossils ever found.

"Some features of the nautilus -- like the shell giving it the 'living fossil' label -- may not have changed for a long time, but other parts have," said Ward. Allonautilus also sports a ...

The nautilus is a mollusk that has survived on Earth for about 500 million years, but today, they're endangered by shell collectors. Photograph by ENRIC SALA, Nat Geo Image Collection 3.

Unlike its cousins, the nautilus lives inside a hard external shell that has multiple closed interior chambers. And a nautilus has around 90 tentacles, the most of any cephalopod.

If you look at the fossil shells of ammonoids over the course of that 340 million years, you'll notice something striking--as time goes on, ... Nautilus shells have a similar coating.