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

Acanthograptus		KP1181
Acanthograptus		XA359
Acanthograptus		VK174
Acanthograptus		BB370
Acanthograptus		XA347
Acanthograptus		KP1222
Acanthograptus		KP1171
Acanthograptus		KP1142
Acrograptus crassus	Bouček (1973), Pl. XI, fig. 1	BB65
Acrograptus crassus	Bouček (1973), text. fig. 19a	BB66
Acrograptus crassus	Bouček (1973), Pl. XI, fig. 2, text. fig 19b	BB67
Acrograptus crassus	Bouček (1973), Pl. XI, fig. 3, text. fig 19c	BB68
Acrograptus crassus	Bouček (1973), text. fig. 19e, f	BB69
Acrograptus lipoldi	Bouček (1973), Pl. XI, fig. 7, text. fig. 20d	BB71
Acrograptus lipoldi	Bouček (1973), text. fig. 20g	BB73
Acrograptus lipoldi	Bouček (1973), text. fig. 20a, b	BB70
Acrograptus lipoldi	Bouček (1973), text. fig. 20h	BB74
Acrograptus lipoldi	Bouček (1973), Pl. XI, fig. 5, text. fig. 20e, f	BB72
Acrograptus nicholsoni	Bouček (1973), text. fig. 21f	BB78
Acrograptus nicholsoni	Bouček (1973), text. fig. 21d	BB77

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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]