Overview
A fossil discovery near Richmond in Outback Queensland has provided evidence of a prehistoric three-tier food chain. This specimen, termed a 'Bag of Bones,' documents a feeding event involving three distinct prehistoric animals: a pterosaur, an elasmosaur, and an ichthyosaur. The fossil indicates that an elasmosaur consumed a pterosaur, and subsequently, the elasmosaur itself became prey for a larger fish-eating ichthyosaur.
Research Context
The discovery represents what has been described as the first evidence of a flying reptile being consumed by a marine reptile, followed by that marine predator becoming prey itself. This particular fossil, found in Outback Queensland, offers insights into predator-prey dynamics within ancient marine ecosystems. The state of preservation of the specimen enabled the identification of the sequence of predation events involved.
Approach
The research involved the analysis of a fossil specimen recovered from Outback Queensland. The specimen contained skeletal remains of multiple distinct animals. Paleontological examination focused on identifying the species involved and interpreting the taphonomic evidence to reconstruct the sequence of feeding interactions. The identification of a pterosaur within the stomach contents of an elasmosaur, and the subsequent presence of the elasmosaur within a larger predatory marine reptile (an ichthyosaur), formed the basis of the interpretation of a three-tier food web.
Findings
The 'Bag of Bones' fossil contains the remains of three different prehistoric creatures, offering a direct record of ancient trophic interactions:
- Pterosaur consumption: Evidence suggests a pterosaur was ingested by an elasmosaur. This represents a rare instance of a flying reptile being consumed by a marine reptile.
- Elasmosaur predation: The elasmosaur, after consuming the pterosaur, became prey for a larger predator.
- Ichthyosaur as apex predator: A large ichthyosaur, identified as a fish-eating marine reptile, consumed the elasmosaur.
The fossil therefore captures a sequence where one predator became prey for another, providing a snapshot of an ancient food chain from the Richmond area in Outback Queensland.
Why This Matters
The fossil provides direct evidence of intricate predator-prey relationships in prehistoric marine environments, documenting a specific three-tier feeding event which included aerial, mid-tier marine, and apex marine predators.