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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

Callograptus p620
Callograptus BB203
Callograptus BB258
Callograptus MM457
Callograptus XA355
Callograptus XA767
Callograptus MM460
Callograptus BB226
CallograptusKraft (1975), Pl. VII, fig. 4 XA365
Callograptus undosus XA360
Callograptus undosus XA373
Callograptus undosus XA366
Callograptus undosus XA354
Callograptus undosus XA374
Callograptus undosusKraft (1975), Pl. V, fig. 3 XA352
Callograptus undulosus XA349
Campograptus clinganiŠtorch (1988), Pl. X. fig. 3, text. fig. 6A PŠ221
Campograptus clinganiŠtorch (1998), Pl. 19, fig. 8.; Text-fig. 10, fig. 4B PŠ919
Campograptus clingani PŠ863
Campograptus clinganiŠtorch (1988), Pl. X, fig. 2 PŠ249
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]