In an interesting discovery, paleontologists from Universität Hohenheim's Staatliches Museum für Naturkunde Stuttgart have unearthed a fossilized fish that tells of a tale of a meal gone awry from 180 million years ago. 

The find, published in the Geological Magazine, showcases an actinopterygian fish named Pachycormus macropterus and its unfortunate fate after swallowing an oversized ammonite, an ancient shell-bearing creature. 

This unique fossil provides insights into predator-prey interactions in the early Jurassic period and reveals how this ancient fish met its untimely demise.

Ancient Predatory Behaviors

Phys.org reports that the Pachycormus macropterus, dated 174 and 182 million years ago, was a bony, ray-finned fish akin to the modern-day lionfish. The researchers uncovered a wealth of information about its diet and behaviors by analyzing its fossilized remains. 

The fish's belly contained remnants of various prey, including soft-bodied mollusks resembling today's cuttlefish or squid and smaller fish. 

However, the most astonishing find was the presence of a large ammonite conch, approximately 10 centimeters across, within the fish's gut.

Upon closer examination, the researchers deduced that the ammonite's presence was not intentional. Instead, they suggest the fish accidentally ingested the ammonite, either misidentifying it as prey or due to some unknown mishap that caused it to become lodged in the fish's mouth. 

This unintended ingestion had fatal consequences - it probably got stuck in the fish's mouth, like a persistent popcorn kernel wedged between your teeth after a movie night.

Fatal Meal

Once the ammonite made its way into the fish's digestive tract, it proved too large for the fish to process effectively. The researchers posit that the ammonite's shell likely blocked the passage to the intestine, impeding digestion and causing either congestion or internal bleeding. 

The fish's death followed swiftly, with the unfortunate creature succumbing within hours of swallowing its oversized meal.

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Following its demise, the ill-fated fish sank to the sea floor, entombing in mud over millennia. Remarkably, the fish's stomach acted as a protective chamber, preserving the ammonite's remains with astonishing fidelity. 

Over millions of years, the mud hardened into rock, preserving the fish's final moments along with the contents of its stomach-like an ancient time capsule waiting to be discovered.

The researchers described the ammonite's condition as having excellent preservation, its aragonite shell still retaining its shiny appearance with only minor signs of damage from stomach acids.

Revealing Ancient Ecosystems

The discovery of Pachycormus macropterus and its unfortunate encounter with the ammonite sheds light on the complex predator-prey relationships that existed in the early Jurassic period. 

This finding marks the first documented instance of a fatal last meal in an extinct pachycormid fish, providing a rare and invaluable glimpse into the lives of these ancient creatures.

Moreover, this unique finding challenges previous assumptions about ancient marine ecosystems. It suggests that ammonites, typically considered agile and elusive creatures, may have been more frequently preyed upon by bony fish during the Jurassic era than previously envisioned. 

This revelation opens up new avenues of inquiry into the dynamics of prehistoric food webs and the ecological roles of these now-extinct species.

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