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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 clavulus BB310
Didymograptus clavulus BB219
Didymograptus clavulusBouček (1973), Pl. XVIII, fig. 1 BB121
Didymograptus clavulusBouček (1973), text. fig. 32c BB123
Didymograptus clavulus PP1423
Didymograptus clavulus PP1428
Didymograptus clavulus XA772
Didymograptus clavulus BB211
Didymograptus clavulusBouček (1973), Pl. XVI, fig. 2 BB119
Didymograptus clavulusBouček (1973), text. fig. 32d BB124
Didymograptus clavulus BB350
Didymograptus clavulus BB367
Didymograptus clavulus BB214
Didymograptus clavulus BB375
Didymograptus clavulus JP1392
Didymograptus clavulus JP838
Didymograptus clavulus JP1389
Didymograptus clavulus PP1426
Didymograptus clavulus BB210
Didymograptus clavulus BB218
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]