 | Graptolites (Graptolithina) + pterobranchs (Pterobranchia) = hemichordate class Graptolithoidea.
This site presents a provocative theory that turns graptolites, a kind of animals that lived in ancient seas forming small floating or attached colonies that resemble coral reef chunks or wasp nests, into living fossils. That is, they put forward the notion that there are actually living graptolites in today's world. The theory states that Cephalodiscus graptolitoides, from Lifou, New Caledonia, are the last representative - but a true one in fact - of this family gone fishing about 300 million years ago.
Well, we cannot explain the whole thing here; Graptolite.net provides in-depth information on graptolites so it is heavy stuff to take slowly. This is very intriguing stuff that deserves a website visit.
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