Sademes

Sademedes, also known as Naiadopex, is a genus of extinct ammonites, a group of shelled cephalopods. They belong to the order Ammonitida and are considered a type of coiled-shelled cephalopod. The name Sademedes comes from the Greek word'sadelements', which means'sandlings'.

Fossils of Sademedes have been found in various geological formations of Israel, which date back to the Albian stage of the Cretaceous period. This period is dated to around 110 to 100 million years ago. Sademedes fossils vary in size but range from 5 to 40 centimeters in length.

Geologists and paleontologists have classified Sademedes as operating coiling in the slightly prolejarate mode. This means that the shell will grow in an outward direction, away from the central body of the animal. They are considered members of the family Nephrolicyritidae.

Additionally to time and size variation of the shells, it was determined that Sademedes are a type of encapsulating species. This notes that as the shell grows in size, substantial increases in whorl number occur.