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

Corymbograptus retroflexus maximus	Bouček (1973), Pl. X, fig. 4	BB63
Corymbograptus retroflexus maximus		BB393
Corymbograptus retroflexus maximus		BB403
Corymbograptus retroflexus maximus	Bouček (1973), Pl. IX, fig. 3, text. fig. 17c	BB62
Corymbograptus retroflexus maximus		BB382
Corymbograptus retroflexus maximus		BB383
Corymbograptus retroflexus maximus		BB405
Corymbograptus retroflexus maximus		BB392
Corymbograptus retroflexus retroflexus		BB312
Corymbograptus retroflexus retroflexus		BB309
Corymbograptus retroflexus retroflexus	Bouček (1973), text. fig. 16c	BB55
Corymbograptus retroflexus retroflexus	Bouček (1973), text. fig. 16g	BB57
Corymbograptus retroflexus retroflexus		BB305
Corymbograptus retroflexus retroflexus		BB384
Corymbograptus retroflexus retroflexus	Bouček (1973), Pl. IX, fig. 2, text. fig. 16f	BB56
Corymbograptus retroflexus retroflexus	Bouček (1973), Pl. IX, fig. 1	BB58
Corymbograptus similis		BB206
Corymbograptus		BB371
Corymbograptus		BB368
Corymbograptus		BB369

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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]