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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

Tetragraptus kindleiBouček (1973), Pl. I, fig. 5, text. fig 4b BB6
Tetragraptus pseudobigsbyi BB278
Tetragraptus pseudobigsbyi BB169
Tetragraptus pseudobigsbyiBouček (1973), Pl. I, fig. 1 BB5
Tetragraptus pseudobigsbyi BB280
Tetragraptus pseudobigsbyiBouček (1973), text. fig. 3e BB2
Tetragraptus pseudobigsbyiBouček (1973), text. fig. 3g BB4
Tetragraptus pseudobigsbyiBouček (1973), text. fig. 3f BB3
Tetragraptus pseudobigsbyi BB266
Tetragraptus pseudobigsbyi BB225
Tetragraptus pseudobigsbyi BB277
Tetragraptus pseudobigsbyi BB279
Tetragraptus pseudobigsbyi BB281
Tetragraptus pseudobigsbyi BB282
Tetragraptus pseudobigsbyi BB265
Tetragraptus pseudobigsbyi XA768
Tetragraptus pseudobigsbyi BB276
Tetragraptus reclinatus abbreviatus BB228
Tetragraptus reclinatus abbreviatus BB182
Tetragraptus reclinatus abbreviatus BB232
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]