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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

Glyptograptus teretiusculus p4847
Glyptograptus teretiusculusBouček (1973), Pl. XXIV, fig. 5 BB107
Glyptograptus teretiusculusBouček (1973), Pl. XXIV, fig. 1 BB17
Glyptograptus teretiusculus BB292
Glyptograptus teretiusculus XA760
Glyptograptus teretiusculusBouček (1973), Pl. XXIV, fig. 3 BB167
Glyptograptus teretiusculus BB294
Glyptograptus teretiusculus p4846
Glyptograptus teretiusculus p4848
Glyptograptus teretiusculus p4684
Glyptograptus teretiusculusBouček (1973), Pl. XXIV, fig. 2 BB164
Glyptograptus teretiusculus p4850
Glyptograptus teretiusculus p4851
Glyptograptus teretiusculus p4852
Glyptograptus teretiusculus p4853
Glyptograptus teretiusculus p4856
Glyptograptus teretiusculus BB293
Glyptograptus teretiusculus p4855
Glyptograptus teretiusculus BB291
Glyptograptus teretiusculusBouček (1973), Pl. XXIV, fig. 4 BB165
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]