Human-size ammonites swam on both sides of the Atlantic Ocean

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About 80 million years ago, human-size sea creatures with tentacle-like arms and coiled shells up to 6 feet (1.8 meters) wide glided through the Atlantic Ocean, a new study reveals.

These creatures were the world's largest ammonites, a group of shelled cephalopods that went extinct roughly 66 million years ago. The largest ammonite fossil ever discovered belongs to the species Parapuzosia seppenradensis; the fossil, which was found in Germany in 1895, has a gargantuan shell measuring 5.7 feet (1.7 m) across.

Now, in a new study, published Wednesday (Nov. 10) in the journal PLOS One, researchers filled in the evolutionary history of the massive cephalopod by examining 154 ammonite fossils, including a handful of historic specimens and more than 100 newfound fossils gathered from England and Mexico.

A small specimen doesn't look like a small version of this giant ammonite … they change during growth," Ifrim told Live Science.

(nautiloids - present day lookalike of ammonites)

  With more specimens in hand, the team could see how P. seppenradensis and P. leptophylla each followed a distinct, five-stage growth cycle, where their shells grew steadily and their morphology changed, she said.

Ammonites of comparable girth also could be found across the Atlantic, and at the same time period, the team found. "We did not expect to find (P.) seppenradensis and this ancestor on the other side of the Atlantic when we started the study," Ifrim said.

Source: https://www.livescience.com/largest-ammonites-evolved-80-million-years-ago?

[KORG 4,756]

They were the aliens that wiped out the dinosaurs but were ultimately run out of mass population by humans. They will return.

That's why cephalopods are so intelligent. They're not from here.

[SadBoi808 1,120]

[Horny Chicken 11,220]

So many calamari recipes running through my head.  

[Lucas 31,681]

Honestly glad I didn't live in those times! All those creatures were scary as ****.

Now we are the creatures destroying the entire planet, and feeding animals so we can eat more of them! Kinda dark if you think about it

[Awakened M 3,286]

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17 hours ago, Lucas said:

Honestly glad I didn't live in those times! All those creatures were scary as ****.

Now we are the creatures destroying the entire planet, and feeding animals so we can eat more of them! Kinda dark if you think about it

Tbh I don't think that size alone makes an animal scary. For instance, most people are not scared by dolphins, whales or elephants despite their size, and they are mammals. Ammonites were probably very unscarry too.

[Helxig 45,814]

17 hours ago, Awakened M said:

I came here to post omanyte!