Palaeozoic giant dragonflies were hawker predators

Area of Science:

• Paleontology
• Entomology
• Evolutionary Biology

Background:

• The Late Palaeozoic featured giant meganeurids, ancient relatives of modern dragonflies, with wingspans up to 71 cm.
• Previous reconstructions often depicted these insects in dense forests, but biological details remain scarce.

Purpose of the Study:

• To investigate the habitat and predatory behaviors of the giant dragonfly Meganeurites gracilipes.
• To reconstruct the biology of extinct Odonatoptera based on preserved morphological evidence.

Main Methods:

• Analysis of the exceptionally preserved fossil Meganeurites gracilipes, focusing on head and body structures.
• Comparative morphological analysis with extant Odonata (dragonflies) to infer function and behavior.

Main Results:

• Meganeurites gracilipes possessed dorsally hypertrophied compound eyes, indicating a specialization for long-distance, aerial vision.
• Cranial and post-cranial features, including sturdy mandibles and tibial spines, align with predatory adaptations for aerial prey capture.
• The elongate wing structure suggests it was ill-suited for dense, forested environments, favoring more open habitats.

Conclusions:

• Meganeurites gracilipes likely inhabited open environments, contrary to previous assumptions of forest dwelling.
• The species exhibited specialized predatory behaviors analogous to modern 'hawker' or 'percher' dragonflies.
• Palaeozoic Odonatoptera displayed significant morphological adaptations for aerial hunting strategies.