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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

Diversograptus capillaris pergracilis p392
Diversograptus pergracilis p4694
Eotetragraptus harti BB196
Eotetragraptus harti BB198
Eotetragraptus harti BB197
Eotetragraptus harti BB199
Eotetragraptus harti BB195
Eotetragraptus harti BB194
Eotetragraptus harti BB193
Eotetragraptus hartiBouček (1973), text. fig. 5 c, d BB9
Eotetragraptus membranaceusBouček (1973), text. fig. 6b BB11
Eotetragraptus membranaceusBouček (1973), Pl. IV, fig. 4 BB16
Eotetragraptus membranaceus XA782
Eotetragraptus membranaceus XA784
Eotetragraptus membranaceusBouček (1973), text. fig 6 c BB12
Eotetragraptus membranaceusBouček (1973), text. fig 6 d BB13
Eotetragraptus membranaceus BB245
Eotetragraptus membranaceusBouček (1973), Pl. IV, fig. 2, text. fig. 6 f BB15
Eotetragraptus membranaceus BB192
Eotetragraptus membranaceusBouček (1973), Pl. IV, fig. 3, text. fig. 6a BB10
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]