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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

Didymograptus pseudogeminus BB271
Didymograptus pseudogeminusBouček (1973), text. fig. 29d BB113
Didymograptus pseudogeminus BB244
Didymograptus pseudogeminus BB220
Didymograptus pseudogeminusBouček (1973), text. fig. 29g BB109
Didymograptus pseudogeminusAD, Bouček (1973), měřený jedinec v Pl. č. 10 BB172
Didymograptus pseudogeminus BB318
Didymograptus pseudogeminus BB359
Didymograptus pseudogeminusBouček (1973), Pl. XV, fig. 4, text. fig. 29a BB108
Didymograptus pseudogeminusBouček (1973), text. fig. 29b BB112
Didymograptus pseudogeminusBouček (1973), text. fig. 29c BB111
Didymograptus pseudogeminus BB253
Didymograptus pseudogeminusBouček (1973), text. fig. 29f BB110
Didymograptus retroflexus retroflexus BB336
Didymograptus PP655
Didymograptus JK6870
Didymograptus BB327
Didymograptus PP1416
Didymograptus JK6869
Didymograptus XA91
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]