Monograptus

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Monograptus Temporal range: Silurian-Lower Devonian
Monograptus spiralis
Scientific classification
Kingdom:	Animalia
Phylum:	Hemichordata
Class:	Graptolithina
Order:	Graptoloidea
Family:	Monograptidae
Genus:	Monograptus Geinitz, 1852

Monograptus is a genus of graptolites in the Order Graptoloidea. This particular genus is the last stage of the graptoloid evolution before its extinction in the early Devonian. A characteristic of the genus includes one uniserial stipes with very elaborate thecae. This particular genus contains large number of graptolite species and may not be monophyletic.

Biostratigraphic significance[]

The International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum (FAD) of Monograptus uniformis as the defining biological marker for the start of the Lochkovian, 419.2 ± 3.2 million years ago, the earliest stage of the Devonian.^[1] ICS has assigned the FAD of Monograptus parultimus defining biological marker for the start of the Pridoli epoch, 423.0 ± 2.3 million years ago, of Monograptus turriculatus (together with the replacement of the brachiopod with ) for the start of the Telychian, 438.5 ± 1.1 million years ago, and of Monograptus austerus sequens for the start of the Aeronian, 440.8 ± 1.2 million years ago, all stages of the Silurian.

References[]

External links[]

• Photo; Article english.fossiel.net—"graptolite Monograptus from Bornholm, Denmark"

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