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Ordovician Trilobite Genera T-ShirtArtist: ldn_rdnt_art The Ordovician was the final major period when trilobites greatly diversified, with very few completely new body forms appearing afterward. Most later trilobite evolution involved small changes to forms that had already developed during the Ordovician. By the time of the Ordovician mass extinction, trilobite expansion had ended, and their long decline had begun. This period represents the peak of trilobite variety in both shape

The symmetrical composition and clean negative space give it a balanced

this shirt blends accuracy with a modern

Crafted with eco-friendly materials

Expertly crafted with ecological conservation in mind

this shirt is perfect for curious minds who love dinosaurs

the horned ceratopsian dinosaur from the Late Cretaceous period

humorous message inspired by nature’s ultimate ambush loungers

one of the most iconic herbivores of the Late Cretaceous period (about 68–66 million years ago)

This Natural History: Biology & Environment T-Shirt is perfect for those interested in science and the environment

retro-styled Compsognathus in green

rex roamed the Earth during the Late Cretaceous period

this t-shirt is perfect for dinosaur enthusiasts and nature lovers alike