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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

Dictyonema zelkovicenseAD, Kraft (1982) JK5069
Dictyonema zelkovicense MŠ6052
Dictyonema zelkovicense MŠ7113
Dictyonema zelkovicenseKraft (1982), Pl. 4, fig. 1 MŠ7080
Dictyonema zelkovicenseAD, Kraft (1982) JK5023
Dictyonema zelkovicenseAD, Kraft (1982) JK5075
Dictyonema zelkovicenseKraft (1982), Pl. 3, fig. 2 MŠ7120
Dictyonema zelkovicense MŠ7131
Dictyonema zelkovicense MŠ7171
Dictyonema zelkovicense MŠ7037
Dicytyonema elongatum p5574
Didymograptus artus BB356
Didymograptus artus XA776
Didymograptus artus BB320
Didymograptus artus XA779
Didymograptus artusBouèek (1973), text. fig. 26g BB100
Didymograptus artus BB236
Didymograptus bifidusBouèek (1973), text. fig. 31e BB116
Didymograptus bifidusBouèek (1973), text. fig. 31c BB115
Didymograptus bifidusBouèek (1973), text. fig. 31g BB117
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]