Organism · Arthropods
Eophrynus prestvicii
Source time context (not species duration) · ≈ 359–299 Ma
Inferred life reconstruction
Eophrynus prestvicii
Overview
Eophrynus prestvicii is an arachnid with striking tubercles and spines on its flattened rear body. Specimen BU699, investigated using X-ray microtomography, reveals its body structure. This research explores a broad body and several appendages in three dimensions.[1]
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Key facts
The eight walking legs and one pair of pedipalps are different appendages. Small chelicerae lie beneath the front body, between the bases of the pedipalps. Even on one animal, appendages must be examined separately in terms of position and shape.[1]
Time and place
A Late Carboniferous specimen from the Middle Coal Measures in present-day Britain was studied. The entire Carboniferous spanned approximately 360–300 million years ago. Microtomography provided a way to examine this small, ancient fossil in detail.[1][2]
The time range describes source context, not the complete duration of this species.
Size, form and skeleton
The front body connects to a flattened rear body, and four pairs of walking legs are present. Large and small tubercles and two pairs of posterior spines are described on the rear body. Outline, surface ornamentation, and appendages can be explored separately.[1]
A 2014 reassessment recorded a body length of 3 cm for Eophrynus prestvicii specimen BU 699. X-rays revealed its form inside the rock, allowing the spines and legs on its small body to be reconstructed in detail.[7]
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Habitat and reproduction
How can small structures hidden beneath a body be identified? This study used microtomography to investigate connections between appendages and the body. It enabled the positions of small structures to be considered beyond the broad outline visible externally.[1]
Fossil discovery
Researchers described the scan data for BU699 and presented a composite anatomical reconstruction based on it. They distinguished and explained the front and rear body, legs, pedipalps, and chelicerae. Internal information from a small fossil was organized into an accessible account of its body.[1]
References
- Study — Microtomography of Eophrynus
- International Commission on Stratigraphy (2024) — Geological time chart
- Study — Microtomography of Eophrynus
- International Commission on Stratigraphy (2024) — Geological time chart
- Study — Morphology of Maiocercus and related arachnids
- International Commission on Stratigraphy (2024) — Geological time chart
- Dunlop·Garwood (2014) — Reconstructing the spatial structure of Eophrynus
Research questions
Does counting eight walking legs account for all its appendages? Pedipalps and chelicerae are separate from the walking legs. Distinguishing appendage types reveals greater variety around an arachnid’s head.[1]
Observation
Find the large and small tubercles on the flattened rear body and the two pairs of posterior spines. Then move your gaze to the walking legs and front pedipalps to see differences between the body surface and appendages.[1]
Related organisms
Maiocercus celticusArthropodsSource time context (not species duration) · ≈ 359–299 MaReading small Carboniferous fossils in three dimensions
Eophrynus and Maiocercus are Late Carboniferous arachnids. Follow studies that used tomography on different specimens to compare the shape of the broad rear body and the connections of small appendages.