Ammonite
Related Category: Zoology: Invertebrates
(m´nt), one of a type of extinct marine cephalopod mollusk, related to the nautilus and resembling it in having an elaborately coiled and chambered shell.
Ammonites were predatory, squidlike creatures that lived inside coil-shaped shells. Like other cephalopods, ammonites had sharp, beaklike jaws inside a ring of tentacles that extended from their shells to snare prey such as small fish and crustaceans.
Ammonites
Ammonites were free-swimming molluscs of the ancient oceans, living around the same time that the dinosaurs walked the Earth and disappearing during the same extinction event.
AMMONITE
Ammonite was an early mollusk, a fast-moving predatory marine invertebrate. These cephalopods are now exinct.
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An ammonite fossil
There is variability in the fossil record as to the extinction rate of marine invertebrates across the K-T boundary. The apparent rate is influenced by the lack of fossil records rather than actual extinction.[7] ...
Impression fossil: ammonite, internal
Impression fossil: armoured fish, external
Impression fossil: bark, external
Impression fossil: trilobite, internal
Impression fossils
Improved Burial Case
In Pursuit of the Past ...
In the water, it fed on fish and ammonites. It is believed that Tanystropheus was not a fast swimmer and often walked along the seabed, using its long neck to get within range of prey without being noticed.
An ammonite had an external, coiled shell similar to that of Nautilus. Ammonites were very successful -- scientists have described 600 genera based on shell type - but became extinct at the end of the Mesozoic.
Swimming mollusks, called ammonites, were residents, not passersby, researchers found.
Aging Male Giraffes Go Black, Not Gray
Their sienna brown spots change to a coal-black over the stint of 1 to 2 years.
Fossil Record: The fossil record of in situ hermit crabs using gastropod shells stretches back to the Late Cretaceous. Before that time, at least some hermit crabs used ammonites' shells instead, ...
There were no dinosaurs at the start of the Triassic period, but there were many amphibians and some reptiles. In the seas, corals appeared and ammonites reappeared. On land, the plants were mainly seed plants and conifers.
 See also: Dinosaur, Diver, Pterosaur, Lizard, Cephalopod
  
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