A 324-million-year-old fossil reveals an amphibious stem insect
Researchers re-examined a fossil from Texas and described Chosha praecursor, an insect from about 324 million years ago with an ovipositor, a terminal filament, and paddle-like abdominal limbs. Their phylogenetic analysis places it as a likely early-diverging insect, while the unusual appendages suggest a semiaquatic way of life. The study helps bridge a gap in the fossil record but does not establish that all early insects were aquatic.
The record ends here. Everything below this line is invented.
What if a protected insect corridor had to include water as well as land?
Part one
Paddle Legs
Luz opened the schoolyard sluice before the children arrived. Water spread across the low field, stopping just short of the walking path. Her job was to keep the restored floodplain connected: dry ground for nesting, wet ground for the months when the small insects crossed between them.
The new corridor map had been drawn from fossil anatomy, modern surveys, and years of flood records. It treated the margin as habitat, not leftover ground. The town council wanted to fill the shallow basin for a second classroom. Luz's own son had asked for that room; he needed a place where the summer heat would not keep him from lessons.
She checked the insect traps and found a row of pale eggs beneath a reed stem. The fossil had made the planners treat the wet margin as habitat, and the live traps now held an insect at the edge. Still, the map's protected margin ended at the sluice, and the eggs lay just beyond it. Luz could close the gate, keeping the basin dry for construction, or let the water cross the painted boundary. She pulled the lever down. The shallow field filled, and the reed stem lifted with it.
What’s real
- Chosha praecursor lived about 324 million years ago.
- Its abdomen had paddle-like appendages.
- Researchers infer a possible semiaquatic life history.
What’s invented
- Luz, her son, and the floodplain school are fictional.
- The corridor map and local insect species are invented.
- The fossil does not show that modern insects descend from Chosha.
Part two: The Flood Margin
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Filed under biology, palaeontology, insects, wetlands.