Accessed December 29, 2015. The shell of an adult nautilus contains over 30 chambers. Their eyesight is very poor because their eyes contains no lenses.
Follow Us on Twitter. Cephalopods of the world. Factors such as requirement for buoyancy regulation, preferred feeding habitat and predator avoidance may combine to create vertical migration patterns best suited to each distinct population and location. This water enters the mantle cavity and is expelled through a siphon. The chambers are ballast tanks that help the nautilus maintain buoyancy. Updated March 08, 2018.
These several species are in the Nautilidae family, which contains four species in the genus Nautilus and two species in the genus Allonautilus. National Ocean Service. At night they migrate to shallower waters to feed among the coral reefs. She uses her tentacles to attach each egg to a hard surface where it remains for 9-12 months before emerging as a 3 cm 1.
This nocturnal opportunistic feeder eats shrimp, crabs, fishes, dead animals, and occasionally another nautilus. The nautilus is thought to rely mainly on its sense of smell when searching for food or looking for a mate.
Unlike most other cephalopods that have a short life span, the chambered nautilus can live 16 or more years. These animals have a distinctive, fuzzy-looking shell. Chambered Nautilus Nautilus pompilius The curious-looking chambered nautilus , also known simply as the nautilus, is considered by many to be a living fossil.
It is thought that they find their prey by smell.
The nautilus can protect itself by withdrawing into the shell and sealing it closed with a fleshy trapdoor called a hood.
They are also caught for their meat and for use in aquariums. Their shell is so beautiful that harvesting has caused a decline in some populations. They have about 90 tentacles, but they do not have suckers.