The scientific article "A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas" by Eaton and Stewart (1960) describes a new amphibian fossil unearthed in Kansas. Here's a breakdown of the key points:
- Fossil Discovery: The research centers around a fossil skeleton of a small amphibian named Hesperoherpeton garnettense, found in Pennsylvanian-age rock layers of Kansas.
- Re-examination: The study re-evaluates the classification of Hesperoherpeton based on a more complete fossil specimen than previously available.
- Unique Features: The analysis reveals that Hesperoherpeton possesses anatomical features unlike known embolomeres (a group of early amphibians). These features are more primitive, particularly in the limbs and braincase.
- Comparison: The authors compare the vertebrae of Hesperoherpeton to those of Ichthyostegalia, a group of even earlier amphibious fish.
- New Order Proposal: Based on the unique characteristics, the study suggests that Hesperoherpeton represents a new order of fish-like amphibians, distinct from previously established groups.
- Significance: This discovery sheds light on the diversity of early amphibians and challenges our understanding of their evolutionary history. It suggests a lineage of amphibians with more primitive traits existing alongside more advanced forms during the Pennsylvanian period.
Additional Notes:
- The authors likely discuss the geological context of the fossil find, including the specific rock formation and its age within the Pennsylvanian epoch.
- The paper might delve into anatomical details of Hesperoherpeton to support the argument for a new order.
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