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

Orthograptus mutabilis		BB619
Orthograptus mutabilis		BB624
Orthograptus mutabilis		BB590
Orthograptus mutabilis		BB618
Orthograptus obuti		PŠ148
Orthograptus obuti	AD, Štorch (1985)	PŠ182
Orthograptus obuti	AD, Štorch (1985)	PŠ181
Orthograptus obuti	AD, Štorch (1985)	PŠ179
Orthograptus obuti	AD, Štorch (1985)	PŠ168
Orthograptus obuti	AD, Štorch (1985)	PŠ147
Orthograptus obuti	Štorch (1985), Pl. III, fig. 2, text. fig. 2H	PŠ187
Orthograptus obuti	AD, Štorch (1985)	PŠ180
Orthograptus obuti	AD, Štorch (1985)	PŠ149
Orthograptus obuti	AD, Štorch (1985)	PŠ166
Orthograptus obuti	Štorch (1985), Pl. III, fig. 4	PŠ185
Orthograptus obuti	AD, Štorch (1985)	PŠ150
Orthograptus obuti	Štorch (1985), Pl. IV, fig. 1	PŠ186
Orthograptus obuti	AD, Štorch (1985)	PŠ175
Orthograptus obuti	Štorch (1985), Pl. IV. fig. 6, text. fig. 2J	PŠ170
Orthograptus obuti	Štorch (1985), Pl. III. fig. 5	PŠ176

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Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]