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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

Monograptus PB900
Monograptus PB903
Monograptus PB908
Monograptus PB909
Monograptus JK6971
Monograptus JK6972
Monograptus JK6950
Monograptus JK6949
Monograptus p5461
Monograptus p5856
Monograptus p3453
Monograptus p3457
Monograptus PB1031
Monograptus PB1032
Monograptus PB898
Monograptus JK6884
Monograptus PB665
Monograptus PB669
Monograptus PŠ196
Monograptus JK6883

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