Scientists have identified the “chunkiest” belemnite ever discovered in the fossil record — an ancient, squid-like creature that lived in the seas covering present-day Wyoming roughly 160 million years ago.
Two exceptionally rare fossils from the Jurassic Period led researchers to identify a new species, Wyoteuthis linsterorum, according to a study published in the journal Papers in Paleontology.
The fossils were discovered in the upper part of Wyoming’s Sundance Formation, which formed in the ancient Sundance Sea.
Their unusually thick, barrel-shaped internal skeletons measured about 60 millimeters across, making them the “fattest” belemnite ever identified, ScienceDaily reported.
Belemnites are extinct marine animals related to modern squid and octopuses.
They are best known for their distinctive, bullet-shaped internal skeletons, which are often the only parts of the animals preserved in the fossil record.
The groundbreaking fossilized rostrum discovered was about 4 inches long but measured up to 2.4 inches across, giving it a remarkably barrel-shaped appearance that stood out to researchers.
Based on comparisons with other belemnites, researchers estimated that the animal itself may have reached nearly 2 feet in length.
Its unusually thick, barrel-shaped rostrum earned the prehistoric animal the “chunky” moniker, although researchers caution that the fossil’s unusual proportions make its overall body size difficult to determine.
Although belemnite fossils are relatively common, W. linsterorum is notable because it belonged to a rare family that had mostly disappeared millions of years earlier.
Its discovery provides evidence that the group survived in a previously unknown refuge in the northeastern Pacific.
The fossil was not the animal’s entire body, but its internal “guard”, the hard, squid-like creature’s fossilized butt.
The discovery shows that even familiar fossil sites can still hold scientific surprises.
The “chunky belemnite” not only discovers a previously unknown species, but also reveals that a rare branch of the belemnite family survived in the ancient Sundance Sea long after researchers thought the group had nearly disappeared.
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