Graptolithina

Graptolithina is the a class in the animal phylum Hemichordata, the members of which are known as Graptolites. Graptolites are fossil colonial animals known chiefly from the Upper Cambrian through the Lower Carboniferous (Mississippian). A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. The name graptolite comes from the Greek graptos, meaning "written", and lithos, meaning "rock", as many graptolite fossils resemble hieroglyphs written on the rock. Linnaeus originally regarded them as 'pictures resembling fossils rather than true fossils', though later workers, supposed them to be related to the hydrozoans.[citation needed] More recent work places them near the pterobranchs, possibly within.

Sources: http://en.wikipedia.org/wiki/Graptolite

On-line reference: Benton a Harper: Introduction to the Paleobiology

Zdroj: Benton a Harper: Introduction to the Paleobiology

Dictyonema hyskovense JK5128	Dictyonema hyskovense JK5074	Dictyonema hyskovense JK5019	Dictyonema hyskovense JK5016	Didymograptus PB710
Didymograptus PB710	Glyptograptus ojsuensis PŠ325	Glyptograptus ojsuensis PŠ327	Glyptograptus PB764	Holograptus deani YA281
Monograptus flemmingi YA32	Monograptus flemmingi YA32	Monograptus flemmingi JK8359	Monograptus transgrediens Ich1881	Monograptus transgrediens Ich1881
Oktavites spiralis (Geinitz) BB737	Oktavites spiralis (Geinitz) BB746	Pristiograptus ultimus YA31	Spirograptus guerichi (Loydell, Štorch a Melchin) BB735	Spirograptus turriculatus (Barrande) BB734

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In the Virtual Museum there are total 3272 samples

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]