Monograptus

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MonograptusTemporal range:
Monograptus spiralis
Kingdom:	Animalia
Phylum:	Hemichordata
Class:	Pterobranchia
Subclass:	Graptolithina
Order:	†Graptoloidea
Family:	†Monograptidae
Genus:	†MonograptusGeinitz, 1852
Monograptus angustidens
Monograptus bouceki
Monograptus priodon
Monograptus transgrediens
Monograptus triangulatus
Monograptus uniformis
Monograptus yukonensis

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Monograptus sp. from the Wenlock of Vailhan, Hérault, France. 12 cm block. Graptolites preserved in three dimensions.

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 a large number of graptolite species and may not be monophyletic.

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. 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 Eocoelia intermedia with E. curtisi) 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.

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

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