A 3-D computer illustration of colonies of the tiny extinct marine animals known as Diplograptus (Graptolites) of the Ordovician period (which occurred from 505 to 438 million years ago). Diplograptus is characterized by a caplike float from which featherlike assemblages of graptolite organisms were suspended. Though purely an artistic interpretation, the structure of the animal is inferred through scientific notation of what the species may have looked like within the environment in which they existed.
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