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The animal, Maximum Diplomoceras (D. maximum), lived about 68 million years ago and grew to 1.5 meters in length.
Scientists discovered a repetitive pattern in the isotope signatures that they believed related to methane released from the seafloor.
They concluded D. maximum added a new rib or ridge to its shell every year.
“These shells grow by accretion, adding a new increment each year.
The creature was an ammonite, a subgroup of extinct cephalopods.
In modern times, cephalopods include mollusks such as squid, octopus, cuttlefish, or nautilus.
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