Sphenoecium Cambrian Graptolite from Christmas Hills

Sphenoecium discoidalis

Phylum Hemichordata, Graptolithina, Dendroidea

Geological Time: Late Middle Cambrian

Size: 5 mm

Fossil Site: Christmas Hills, Tasmania, Australia

This fossil is a Cambrian dendroid graptolite known as Sphenoecium discoidalis. Graptolites are colonial animals belonging to the hemichordates. The term originates from the patronymic genus Graptolithus. The Graptoloidea were pelagic, drifting with the currents, and were the most important members of the plankton before dying out in the early Devonian. This unusual example is seen here as a part/counterpart example.

Also see: Other Graptolite Fossils

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