A soft-bodied mollusc with radula from the Middle Cambrian Burgess Shale

Article Abstract:

The Odontogriphus omalus, originally described as a problematic non-biomineralized lophophorate organism, is re-interpreted on the basis of 189 new specimens including numerous exceptionally well preserved individuals from the Burgess Shale collections of the Royal Ontario Museum. The animals are interpreted to be members of an early stem-group mollusc lineage that probably originated in the Neoproterozoic Ediacaran Period, providing support for the retention of a biomat-based grazing community from the late Precambrian Period until at least the Middle Cambrian.

Canada, Analysis, Physiological aspects, Food and nutrition, Genetic regulation, Phylogeny, Mollusks, Coelenterata, Cnidarians, Molluscs

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Machaeridians are Palaeozoic armored annelids

Article Abstract:

A new family of machaeridian with preserved soft parts, which are found to have a strong affinity towards annelids, is discussed. The family is also found to exhibit special affinity towards a group of Palaeozoic invertebrates.

Economic aspects, Paleozoic Era

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Ancient worms in amour

Article Abstract:

The evolution and origins of machaeridians, a group of enigmatic fossils with scaly amour of mineralized shell plates is discussed.

Natural history, Invertebrates, Fossil, Fossil invertebrates

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