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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 clavulusBouček (1973), text. fig. 32a BB128
Didymograptus clavulus BB235
Didymograptus clavulus BB314
Didymograptus clavulus XA787
Didymograptus clavulus p4683
Didymograptus clavulus PP1424
Didymograptus clavulus PP1429
Didymograptus clavulus p1529
Didymograptus clavulus PP1421
Didymograptus clavulus PP1430
Didymograptus clavulusAD, Bouček (1973), jedinec měřený na Pl. 12 BB170
Didymograptus clavulusBouček (1973), Pl. XVI, fig. 3 BB171
Didymograptus clavulus BB351
Didymograptus clavulusBouček (1973), Pl. XVII, fig. 3-4 BB118
Didymograptus clavulusBouček (1973), Pl. XVIII, fig. 3 BB120
Didymograptus clavulusBouček (1973), text. fig. 32e BB125
Didymograptus clavulusBouček (1973), text. fig. 32b BB129
Didymograptus clavulusBouček (1973), text. fig. 32h BB130
Didymograptus clavulus BB328
Didymograptus clavulus BB343
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]