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

Didymograptus nitidus stanislavi		BB413
Didymograptus nitidus stanislavi		BB409
Didymograptus nitidus stanislavi		BB373
Didymograptus nitidus stanislavi		BB412
Didymograptus nitidus stanislavi		BB388
Didymograptus nitidus stanislavi		BB389
Didymograptus nitidus stanislavi	Bouček (1973), Pl. V, fig. 3, text. fig. 11 f	BB30
Didymograptus nitidus stanislavi		BB408
Didymograptus nitidus stanislavi		BB410
Didymograptus nitidus stanislavi		BB411
Didymograptus nitidus stanislavi		BB415
Didymograptus nitidus undosus	Bouček (1973), text. fig. 11 g	BB32
Didymograptus nitidus undosus	Bouček (1973), Pl. V, fig. 1, text. fig 11i, j	BB34
Didymograptus nitidus undosus	Bouček (1973), Pl. V, fig. 2	BB45
Didymograptus protobifidoides	Bouček (1973), Pl. XV, fig. 6, text. fig. 24 f, g	BB91
Didymograptus protobifidoides		BB268
Didymograptus protobifidoides	Bouček (1973), text. fig. 24e	BB90
Didymograptus pseudogeminus		BB354
Didymograptus pseudogeminus		BB261
Didymograptus pseudogeminus		BB297

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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]