What are nautiloids?
nautiloids are the subcontracting of Cefalopod molluscs that relate to other cephalopods such as octopus and octopus. There are only a few modern types of nautiloids, such as chamber nautilus, but nautiloids are an extremely important fossil group, with samples extending up to 515 million years, during the late Cambrian era. Nautiloids were the first cefalopods and were one of the first "advanced" animals to appear in Cambrian, with relatively large brains and the nervous system. During this time they were the highest sea predators and developed a wide range of shell forms. Nautiloids were the first puzzles that evolved from simpler molluscs and occupied a predator's niche. In just about 50 million years, they went from a few millimeters to a length of 8 meters (26 ft) giants as Cameroceras , considered the largest animal on the planet on Time, when it lived, the Ordovice period, about 450 million years ago.
Like most molluscs, all nautiloids have a shell that first evolved as straight and then curved. This shell consists of many inner chambers or cameras separated by walls called septum. These distinct chambers are produced by an animal as it grows. Nautilus always occupies the last of the chambers called the Living Chamber, and has a fleshy strand of tissue that passes through the chambers, caused by Siphoguncle. Siphuncle helps Nautilus remove water from the chambers of its shell, allowing it to be tightened by narrow adaptation of its internal density with the density of the surrounding seawater.
Like other cephalopods, Nautiloids will tear food with their tentacles and consume it with a sharp inner beak. They see the ocean around them using two eyes without a lens that work with similar principles to the principles of Pinhole Cameras. These unique eyes are important evolutionary intermediaries between light -sensitive spots found in animals such as planarians and sophisticatedLater eyes based on other animals, such as fish. Helped to help scientists in understanding how a complex organ such as the eye can develop, with each intermediate step has an immediate adaptive benefit