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Wisconsin Fossil: Legs Evolved Underwater for Land

By : Elijah TobsMay 9 • 2026, 10:26 PM

TechWorld

Wisconsin Fossil: Legs Evolved Underwater for Land

Source: Pexels

The Core Insight

Paleontologists discovered 35 exceptionally preserved fossils of Waukartus muscularis, an aquatic arthropod from 437 million years ago in Wisconsin's Silurian Brandon Bridge Formation. This stem-myriapod had a long segmented body, at least 11 leg sets, and unbranched uniramous limbs,traits typical of land arthropods like centipedes and millipedes. The find challenges prior views, showing these legs evolved underwater via exaptation, with exopods lost before terrestrialization, preserved in Waukesha Lagerstätte mudstones.

Waukartus Muscularis: Fossils Prove Centipede Legs Evolved in Ancient Seas

Detailed view of fossilized shell patterns embedded in a stone surface, showcasing natural texture. — Silurian fossil of Waukartus muscularis preserving soft tissues and many legs.
(Credit: www.kaboompics.com via Pexels)

Picture this: a creature scuttling across the Silurian seafloor, 437 million years ago, with a body packed full of legs. Not for dry land. For water. Paleontologists just unearthed fossils that flip the script on how centipedes and millipedes got their signature many-legged look. Meet Waukartus muscularis, a bizarre aquatic arthropod from Wisconsin that's rewriting evolutionary history.

These aren't your garden-variety

Detailed image of a centipede crawling over rocky terrain, showing texture. — Aquatic Waukartus muscularis navigating ancient shallow seas.
(Credit: Diego Concepción via Pexels)

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Original Source

Royal Society B (on myriapod evolution)
Nature Ecology & Evolution (Silurian arthropod anatomy)
Science (fossil preservation in Waukesha Lagerstätte)
PNAS (comparative timelines of arthropod limbs)
USGS (diversity in ancient mudstones)
GBIF (modern myriapod species counts)
IUCN (centipede population trends)

Source: Pexels

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Elijah Tobs

A seasoned content architect and digital strategist specializing in deep-dive technical journalism and high-fidelity insights. With over a decade of experience across global finance, technology, and pedagogy, Elijah Tobs focuses on distilling complex narratives into verified, actionable intelligence.

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Editorial Team • Question of the Day

"Do you think centipede legs first evolved in oceans or on land?"

In-Depth Clarity

Frequently Asked

Waukartus muscularis is a bizarre aquatic arthropod from the Silurian period, 437 million years ago, discovered in Wisconsin fossils, featuring a body packed with legs adapted for water.

The fossils come from the Brandon Bridge/Waukesha Lagerstätte in Wisconsin, preserved in shallow marine mudstone with 35 specimens showing muscle and soft tissues.

They prove centipede and millipede legs evolved in ancient seas, with 11+ sets of uniramous limbs, suggesting myriapod ancestry was aquatic and legs were exapted for land.

Preserved in shallow marine mudstone of the Silurian Waukesha Lagerstätte, allowing rare muscle and soft tissue details in over 35 specimens.

Wisconsin Fossil: Legs Evolved Underwater for Land

The Core Insight