アメリカ自然史博物館のインスタグラム(amnh) - 2月23日 23時49分

This #TrilobiteTuesday, we’re talking about the birds and the bees…and trilobites.
It’s easy to think of trilobites as little more than remnants of a bygone era in Earth’s history, but the fact is that even in those primeval seas these amazing arthropods ate, swam, and procreated much like other ocean creatures do today. There are many debates about how trilobites reproduced. One theory is that the inflated glabella featured on some species—such as the dramatic example presented by this Ordovician-age Sphaeorocoryphe from New York State—actually were egg sacks used in the reproductive process. Another theory, however, postulates that such inflation merely served as the trilobite’s flotation device.

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