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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

Thallograptus densusKraft (1982), Pl. 7, fig. 5 JK5046
Thallograptus densus MŠ7046
Thallograptus densusKraft (1982), Pl. VII, fig. 5 JK5046
Thallograptus densusKraft (1982), Pl. 7, fig. 3, 4 JK5032
Thallograptus inaequalis p5940
Thallograptus krizi MŠ7185
Thallograptus krizi MŠ7192
Thallograptus kriziKraft (1982), Pl. VII, fig. 1 MŠ7180
Thallograptus krizi MŠ7193
Thallograptus kriziKraft (1982), Pl. 9, fig. 3 MŠ7186
Thallograptus kriziKraft (1982), Pl. 8, fig. 1 MŠ7194
Thallograptus MŠ7074
Thallograptus MŠ6082
Thallograptus MŠ7064
Thallograptus MŠ7195
Thallograptus MŠ6086
ThallograptusAD, Kraft (1982) JK5086
Thallograptus MŠ7056
ThallograptusAD, Kraft (1982) JK5119
Thallograptus MŠ7157
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]