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User:Abyssal/Portal:Ordovician/DYK/3

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Scanning electron micrograph of a chitinozoan
Scanning electron micrograph of a chitinozoan
  • ...that eighty years on, scientists are still debating whether the Palæozoic fossils known as Chitinozoans (SEM image pictured) represent plants, animals or eggs?
  • ... that small shells of Trigonoconcha are triangular?
  • ... that a fossil of Concavodonta described in 1843 has been lost?
  • ... that one species of the extinct bivalve Similodonta was found in 108.90 metres (357.3 ft) down a Welsh borehole?