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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

Acrograptus nicholsoni XA786
Acrograptus nicholsoni XA785
Acrograptus nicholsoni XA748
Acrograptus nicholsoni XA758
Acrograptus nicholsoni XA750
Acrograptus nicholsoni XA783
Acrograptus nicholsoni XA759
Acrograptus nicholsoni XA780
Acrograptus nicholsoniBouček (1973), text. fig. 21c BB76
Acrograptus nicholsoni XA757
Acrograptus nicholsoni XA755
Acrograptus nicholsoni XA753
Acrograptus nicholsoni XA749
Acrograptus nicholsoni XA756
Acrograptus nicholsoni XA751
Acrograptus nicholsoni XA754
Akidograptus ascensusŠtorch (1983b), Pl.2, fig.9; Text-fig. 1F,H PŠ141
Akidograptus ascensusŠtorch (1983b), Pl.2, fig.7; Text-fig. 1B PŠ141
Akidograptus ascensusŠtorch (1983b), Pl.2, fig.8 PŠ141
Akidograptus ascensus AD Štorch (1983b) PŠ142
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]