Ten newly discovered species of trilobites, hidden for 490 million years in a little-studied part of Thailand, could be the missing pieces in an intricate puzzle of ancient world geography.

Trilobites are extinct sea creatures with half-moon-shaped heads that breathed through their legs. A 100-page monograph in the British journal offers great detail about the new species, including one named in honor of Thai Royal Princess Maha Chakri Sirindhorn.

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