From San Diego Union-Tribune · · 1m 10s
Fossil Reclassification Changes Natural History Understanding
A 324-million-year-old fossil reclassified as an insect shifts scientific understanding of early life evolution.
In brief
A 324-million-year-old fossil reclassified as an insect shifts scientific understanding of early life evolution. A 324-million-year-old fossil at San Diego Natural History Museum reclassified as an insect provides evidence for the earliest insect lineage, challenging previous crustacean classifications. Originally…
Fossil Reclassified
A 324-million-year-old fossil at San Diego Natural History Museum was reclassified from a crustacean to an insect.
New Label Reveals Insect Features
The fossil now labeled Chosha praecursor shows insect traits including an ovipositor and terminal filament.
Hexapod Gap Significance
Reclassification places the fossil at the younger boundary of the hexapod gap, a 60-million-year period with no insect evidence.
Cambridge Research
Cambridge doctoral student Erik Thelka identified insect features using polarized light examination.
Fossil's Dual Features
The fossil shows six insect legs but also crustacean paddle-like legs and gills.
Reclassification Impact
Researchers re-examined older fossils and concluded they are also insects, making this the earliest uncontested insects.
Swimming Adaptation
The extra legs likely enabled swimming, allowing the creature to move between land and water.
Museum Exhibit
Curators created a dedicated exhibit for the fossil under glass with public display references.
The essence
A 324-million-year-old fossil at San Diego Natural History Museum reclassified as an insect provides evidence for the earliest insect lineage, challenging previous crustacean classifications.
