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arthropod fossil recordScientific American
•82% Informative
Odaraia alata was an arthropod with a trident-shaped tooth between external jawlike structures in front of its mouth.
The creature, spanning about 20 centimeters long, likely met its end very suddenly, buried underneath a thick layer of sediment.
It may have contributed to the modern-day dominance of creatures with mandibles, such as insects.
Being a large filter-feeder and evolving a mandible gave Odaraia a double advantage that contributed to an evolutionary arms race, as it pressed other animals to adapt faster in response. Now scientists have set their sights on solving a new mystery: O. alata’s unexpected trident-shaped tooth. “It’s a structure that has not been seen in any other fossil from that time,” Izquierdo-López says. “We have no idea how they evolved or why they aren’t found in any other animal.”.
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