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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 pseudobigsbyi BB282
Tetragraptus pseudobigsbyi BB265
Tetragraptus pseudobigsbyi XA768
Tetragraptus pseudobigsbyi BB276
Tetragraptus reclinatus abbreviatus BB228
Tetragraptus reclinatus abbreviatus BB182
Tetragraptus reclinatus abbreviatus BB232
Tetragraptus reclinatus abbreviatus BB181
Tetragraptus reclinatus abbreviatus BB184
Tetragraptus reclinatus abbreviatusBouèek (1973), text. fig. 3b BB21
Tetragraptus reclinatus abbreviatus BB183
Tetragraptus reclinatus abbreviatus BB173
Thallograptus bohemicusAD, Kraft (1982) JK5025
Thallograptus bohemicusKraft (1982), Pl. 9, fig. 1 JK5013
Thallograptus bohemicus MŠ7041
Thallograptus bohemicusKraft (1982), Pl. 5, fig. 2 MŠ7042
Thallograptus bohemicus MŠ7011
Thallograptus bohemicusKraft (1982), Pl. 5, fig. 1; Pl. 6, fig. 1 MŠ7117
Thallograptus bohemicus MŠ7132
Thallograptus bohemicus MŠ7101
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]