Advanced neutron imaging of a 380-million-year-old Antarctic fish skull has revealed surprising anatomical details about how vertebrates transitioned from water to land, according to paleontologists reporting findings in May 2026.
Scientists peered inside fossilized remains without destructive slicing, visualizing braincase structures and jaw articulations that connect lobe-finned fish to early tetrapod ancestors. The specimen preserves features obscured in prior X-ray studies limited by bone density contrasts.
Researchers said the skull shows intermediate traits supporting both aquatic feeding and emerging neck mobility useful for shallow-water locomotion. Neutron beams penetrated iron-rich matrix surrounding the fossil housed in a curated Antarctic collection.
Understanding terrestrial colonization informs debates about evolutionary timing during the Devonian period when vascular plants expanded riparian habitats. The work complements genomic studies of modern coelacanths and lungfish that retain archaic lineages.
Paleontological teams emphasized Antarctic fieldwork challenges including seasonal access and climate logistics that delay excavation cycles. Digital scans will be shared with museums worldwide to support educational modeling of early tetrapod evolution.
Independent reviewers praised the nondestructive technique as a template for re-examining other iconic transition fossils held in archives.
Museum curators said high-resolution scans will allow students worldwide to examine Devonian transition fossils without transporting fragile Antarctic specimens across continents.
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Sources:
https://www.sciencedaily.com/news/top/science/