アメリカ自然史博物館のインスタグラム(amnh) - 5月6日 05時09分

#TrilobiteTuesday returns! Gabriceraurus mifflinensis is about 465 million years old, found in the fossil-rich Ordovician rocks of Wisconsin. Note the pronounced genal and pygidial spines that emanate, respectively, from the trilobite’s head and tail. Scientists are divided as to the role these spines may have played in the trilobite’s life. Some believe they were used to help in maneuvering through primordial seas, while others say they may have been used as an aid in feeding or even mating.

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