An extinct marine invertebrate animal of the Paleozoic era forming mainly planktonic colonies and believed to be related to the pterobranchs
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graptoliteAn extinct marine invertebrate animal of the Paleozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs
graptolitesAn extinct marine invertebrate animal of the Paleozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs