アメリカ自然史博物館のインスタグラム(amnh) - 5月17日 06時46分

It's time for #TrilobiteTuesday! If you could hop into a time machine and travel back to the Middle Cambrian seas of 515-million-years-ago, life would appear abundant, varied and nothing less than astonishing. Bizarre invertebrate creatures of all sizes and shapes would fill virtually every aquatic niche. Amid patches of filtered sunlight, legions of small, soft-bodied arthropods would float by on tidal currents, while a multitude of trilobite species, such as the Kochina vestita pictured here, would either jet past in water-propelled bursts or scamper across the sea floor on rows of spindly appendages. This would be a world beyond even our most vivid imagination, but one that trilobite enthusiasts might find ever-so-slightly disappointing. Until fairly recently it was standard scientific thought that trilobites dominated these early seas, but a number of recent discoveries have shown that while trilobites were indeed numerous in the ancient Cambrian oceans, other life forms—including the astounding array of soft-bodied arthropods—actually dominated the fauna.

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