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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

Holograptus deaniHavlíèek a Vanìk (1966), Pl. IV, fig. 6foto YA281
Holograptus deaniBouèek (1973), text. fig. 8a BB18
Holograptus deani XA820
Holograptus deaniBouèek (1973), text. fig. 8c, d BB20
Holograptus deani XA821
Holograptus deani BB179
Holograptus deaniBouèek (1973), text. fig. 8b BB19
Hustedograptus teretiusculus (Hisinger) MD150
Hustedograptus teretiusculus (Hisinger) MD162
Hustedograptus teretiusculus (Hisinger) MD157
Hustedograptus teretiusculus (Hisinger) MD89
Koremagraptus imperfectusKraft (1982), Pl. 11, fig. 1; Pl. 12, fig. 2 MŠ7168
Koremagraptus imperfectus MŠ7170
Koremagraptus MŠ6081
Koremagraptus MŠ7043
Koremagraptus JK19404
KoremagraptusKraft (1982), Pl. 11, fig. 2 MŠ7135
Koremagraptus MŠ7082
Koremagraptus MŠ7008
KoremagraptusKraft (1982), Pl. 6, fig. 3; Pl. 10, fig. 1 JK5034
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]