Terrestrial invertebrates in the Rhynie chert ecosystem

Area of Science:

• Paleontology
• Evolutionary Biology
• Early Terrestrial Ecosystems

Background:

• The Rhynie and Windyfield cherts are crucial for understanding early terrestrial life.
• These sites preserve some of the oldest fossilized terrestrial organisms.

Purpose of the Study:

• To analyze the faunal community of the Early Devonian Rhynie and Windyfield cherts.
• To investigate early land-based ecological interactions, including herbivory and predation.
• To identify the earliest representatives of various arthropod groups and their feeding strategies.

Main Methods:

• Fossil analysis of the Rhynie and Windyfield cherts.
• Comparative morphology and ecological inference based on preserved features.
• Dietary analysis through coprolites and gut contents.

Main Results:

• The oldest nematode worm (Nematoda) and evidence of plant parasitism.
• Preservation of the oldest book lungs in trigonotarbids (Arachnida: Trigonotarbida) and oldest mites (Arachnida: Acariformes).
• Identification of the earliest harvestman (Arachnida: Opiliones) with preserved genitalia and tracheae, alongside early myriapods and hexapods (Collembola, Insecta).
• Coprolite analysis challenges previous assumptions about spore-feeding habits.

Conclusions:

• The Rhynie cherts represent a largely intact, ancient terrestrial community.
• The fauna is ecologically consistent with modern organisms found near Icelandic hot springs.
• These fossils provide critical evidence for the evolution of terrestrial life and early ecological strategies.