![]() ‘ Ammonites were born with tiny shells and, as they grew, they built new chambers onto it. ‘We think it’s more likely that ammonites would have had eight arms rather than lots of tentacles like a nautilus, though the shell is more similar to that of a nautilus. Ocean acidification likely dissolved the shells of their microscopic young, which floated on the ocean’s surface early in their life-cycle. “The Ammonites petered out due to more than one disastrous change caused by the impact. The restricted distribution of Ammonites may have contributed to their extinction. What may have caused ammonites to become extinct? In the 2nd century bc they were defeated by Judas Maccabeus. These animals are known from the Jurassic Period, from about 200 million years ago.ĭuring the reign of Jehoiakim (6th century bc), the Ammonites allied themselves with the Chaldeans, Syrians, and others in an attack on Judah and also harassed the Israelites when they attempted to rebuild the Temple of Jerusalem after the Babylonian Exile. Ammonoidea includes a more exclusive group called Ammonitida, also known as the true ammonites. How old are ammonites? The subclass Ammonoidea, a group that is often referred to as ammonites, first appeared about 450 million years ago. The Jurassic Period began about 201 million years ago and the Cretaceous Period ended about 66 million years ago. Together, these represent a time interval of about 140 million years. What age are Ammonites?Īmmonites lived during the periods of Earth history known as the Jurassic and Cretaceous. It is likely that because of the variety and diversity of Ammonite species, that these creatures occupied a number of niches in marine food webs. These two tentacles had many suckers on the end which helped these animals grab prey. It is believed that Ammonites had eight, grasping arms and two much larger tentacles.
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