During the early days JurassicA new study discovers when a squid-like creature was in the process of devouring crustaceans, interrupted by another sea beast, perhaps a shark biting into its fluffy side and killing it. did.
The shark swam away, but crustaceans and squid-like animals (a creature with ten arms and two fins called belemnitida) sank to the bottom of the sea and later fossilized together in Germany. Did.
As a result 180 million years ago fossil Is “unique” and is “one of about 10 specimens of belemnitida. [well-preserved] “Soft tissues around the world,” said Christian Crag, a curator at the University of Zurich’s Museum of Paleontology and a professor at the Institute of Paleontology, a senior researcher, in an email to Live Science.
Specimens also show how predators sometimes prey on themselves. “Predators tend to be happy when they are eating, forgetting to pay close attention to their surroundings and potential dangers,” Krug said. “It may explain why Belemnitida was captured, but there is no evidence of it.”
Fossils also influenced the new term pabulite, which means “food” and “stone” from the Latin words “pabulum” and “lithos”, respectively.Parbite refers to the “leftovers” of a meal that never enter the predator. Digestive system And later fossilized — in this case the leftovers would be belemnitida, the researchers wrote in the study.
The pub light could “provide evidence of incomplete predation,” which was probably what happened here, the researchers wrote in the study. In fact, sharks may have deliberately targeted the fluffy part of belemnitida rather than the pointed, hard tip known as the podium. Vertebrate predators may have learned to avoid indigestible rostras, and as a result, “chewed soft areas that were poorly protected,” the researchers wrote in a study. ing.
Amateur fossil collector Dieter Weber discovered the specimen in 1970 at a small quarry near Holzmaden, a small village near Stuttgart in southwestern Germany. Research collaborator Gunter Schweigert, a curator of Jurassic and Cretaceous invertebrates at the State Museum of Natural History Stuttgart (SMNS), saw specimens in 2019 while visiting Weber’s collection and SMNS. Bought it immediately.
The researchers immediately set about studying the specimens.The belemnites they discovered were a famous species Passaloteuthis laevigataIts fossilized remains have been found in rocks dating back to the Toarcian era (183-174 million years ago) in Europe and Morocco. P. Laebigata It was a small creature with a bullet-shaped podium about 4 inches (9.3 cm) long. Each of the 10 arms was up to 3.5 inches (9 cm) long and had two rows of arm hooks. There are a total of 400 of these hooks. P. Laebigata Grab a slippery prey, Krug said.
“In this individual, two arms with large hooks have been modified. These were used for mating and probably only males had, but in females all 10 arms were similar, It’s not yet. “
Belemnitida is now extinct, but fossils have revealed that they had an inner shell surrounded by muscle and skin, Krug said. He said these strong horizontal swimmers actively preyed on marine life such as fish and crustaceans and were eaten by predators such as sharks and dolphins known as ichthyosaurs.
So it’s no wonder that this belemnitida devoured the crustaceans of this genus. ProeryonHe had a wide, flat, shrimp-like body and long, thin claws, Krug said.However Proeryon “I think these are the remains of old molts,” he wrote in an email because they were poorly preserved. “Crayfish get rid of a lot calcium From the shell before they molt, as they later put it into new skin. “
Cephalopods (including groups) octopus(Squid and nautilus) “I love eating this old skin,” Klug added. “Most of it is really between Belemnitida’s arms and so close to its mouth that it’s possible that Belemnitida was actually eating it.”
Some parts of Belemnitida, such as the podium and arms, are well preserved, but many of their bodies are missing. That’s why “we have to conclude that the larger predators ate most of the belemnitida,” Krug said.
What did you eat Belemnitida?
The first candidate for Belemnitida’s “killer” is the Early Jurassic shark. Hybodushauffianus..As mentioned above H. Haufianus The fossils were packed with the remains of Belemnitida, including dozens of Rostras.
That particular H. Haufianus “Perhaps I encountered a herd of belemnites and became too enthusiastic about it. It ate about 200 of them, but forgot to chew Rostra, thereby choking the stomach and eventually killing it.” Said Krug.
Other suspects include large predatory fish such as: Pachycormus And Saurorhynchus, Saltwater crocodile Steneosaurus, And ichthyosaur StenopterygiusResearchers write that belemnitida megahooks remain in the fossilized stomach.
This study was published online on April 29th. Swiss Journal of Paleontology..
Originally published in Live Science.
Jurassic squid was killed in the middle of a meal, leaving behind this magnificent fossil
Source link Jurassic squid was killed in the middle of a meal, leaving behind this magnificent fossil