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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

Orthograptus insectiformis PŠ143
Orthograptus insectiformis PŠ151
Orthograptus monstrosusAD, Štorch (1985) PŠ174
Orthograptus monstrosusŠtorch (1985), Pl. III , fig. 3, text. fig. 21 PŠ61
Orthograptus monstrosusŠtorch (1985), Pl. II. fig. 2, text. fig. 2M PŠ167
Orthograptus mutabilis BB619
Orthograptus mutabilis BB624
Orthograptus mutabilis BB590
Orthograptus mutabilis BB618
Orthograptus obuti PŠ148
Orthograptus obutiAD, Štorch (1985) PŠ182
Orthograptus obutiAD, Štorch (1985) PŠ181
Orthograptus obutiAD, Štorch (1985) PŠ179
Orthograptus obutiAD, Štorch (1985) PŠ168
Orthograptus obutiAD, Štorch (1985) PŠ147
Orthograptus obutiŠtorch (1985), Pl. III, fig. 2, text. fig. 2H PŠ187
Orthograptus obutiAD, Štorch (1985) PŠ180
Orthograptus obutiAD, Štorch (1985) PŠ149
Orthograptus obutiAD, Štorch (1985) PŠ166
Orthograptus obutiŠtorch (1985), Pl. III, fig. 4 PŠ185
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]