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Scientists Reconstruct Head of 9-Foot Ancient Arthropod: Insights into the Largest Insect Ever

Introduction

As if the sheer size of the largest insect to ever exist-a nearly 9-foot-long creature with dozens of legs-wasn't daunting enough, scientists could previously only speculate about its head's appearance.

Fossil Remains and Their Significance

The fossils that remain are primarily headless exoskeletons, left behind during the molting process, when the creatures shed their outer shells through the head opening as they grew to 8 or 9 feet long and weighed more than 100 pounds.

Detailed Reconstruction of the Head

Scientists have now created a detailed reconstruction after analyzing exceptionally well-preserved, complete juvenile fossils, though they may not be considered cute.

Features of the Giant Insect's Head

The head of the giant insect featured a round, bulbous structure with short, bell-shaped antennae, crab-like protruding eyes, and a small mouth specialized for grinding leaves and bark, as detailed in new research published Wednesday in Science Advances.

Understanding Arthropleura

Known as Arthropleura, these were arthropods--a group that includes crabs, spiders, and insects--exhibiting characteristics similar to modern centipedes and millipedes. However, some of them grew to astonishing sizes, and this specimen was a remarkable combination.

Comparative Anatomy

"Our findings revealed that while the creature had the body of a millipede, its head resembled that of a centipede," explained study co-author and paleobiologist Mickael Lheritier from the Univesity Claude Bernard Lyon in Villeurbanne, France.

Size Debate

The largest Arthropleura could have been the biggest insects to ever exist, though this remains debated. They might come in second to the extinct giant sea scorpion.

Historical Context of Fossil Collection

Scientists in Europe and North America have been collecting fossilized remains and footprints of these giant bugs dating back to the late 1800s.

Insights from Paleobiologists

"We've been hoping to understand the appearance of this animal's head for a very long time," said James Lamsdell, a paleobiologist from West Virginia University, not involved in the research.

Methodology: CT Scans and Fossil Examination

Researchers began by utilizing CT scans to examine fossil specimens of complete juveniles encased in rocks found in a French coal field in the 1980s to develop a model of the head.

Analyzing Hidden Details

According to Lamsdell, this technique enabled researchers to examine "hidden details, such as fragments of the head still encased in the rock," without damaging the fossil.

Preservation Concerns

"As you chip away at the rock, there's no way to know what delicate parts of the fossil might be lost or adversely affected," he said.

Conclusion: Insights into Ancient Life

The juvenile fossil specimens measured approximately 2 inches (6 centimeters), suggesting they might represent a species of Arthropleura that did not reach large sizes. However, researchers noted that they are sufficiently related to offer insight into the appearance of adults--whether colossal or of a less daunting size--during their existence 300 million years ago.

Source

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