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RSS FeedsAre hyoliths Palaeozoic lophophorates?
(PHYSorg.com Archaeology & Fossils)


19 november 2019 01:35:38

Are hyoliths Palaeozoic lophophorates?
(PHYSorg.com Archaeology & Fossils)

Hyoliths are extinct invertebrates with calcareous shells that were common constituents of Cambrian fauna and formed a minor component of benthic faunas throughout the Palaeozoic until their demise in the end-Permian mass extinction. The biological affinity of hyoliths has long been controversial and the group has been compared with a number of animal phyla, most frequently the Mollusca or the Sipuncula, although other researchers have considered hyoliths as a separate `extinct phylum.` However, recent discoveries of a tentaculate feeding apparatus (`lophophore`) and fleshy apical extensions from the shell (`pedicle`), have resulted in hyoliths being placed within the lophophorates with a close relationship to the brachiopods.

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