http://worldcat.org/entity/work/id/344641688

Receptaculitids a phylogenetic debate on a problematic fossil taxon

Receptaculitids are extinct high-level fossils that provide a window into the history of life. After the discovery and analysis of a deposit of phosphatized receptaculitids on the Baltic Sea island of Öland, the authors conclude that receptaculitids possess an attribute not found in any other group of organisms, living or fossil.

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