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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

Spirograptus turriculatus (Barrande)

Inv. no.BB734
TaxonomyKmen: Hemichordata / Třída: Graptolithina / Rod: Spirograptus / Druh: turriculatus
Description
Lithostratigraphylitohlavské souvrství
Chronostratigraphypaleozoikum - silur - llandovery - telych
LocalityLitohlavy - vodní nádrž List ofxhibits on this locality
OriginBouček Bedřich Prof.

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Spirograptus turriculatus
Spirograptus turriculatus (Barrande)

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