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 incertus	Bouček (1973), text. fig. 28d	BB105
Didymograptus incertus		BB324
Didymograptus incertus	Bouček (1973), text. fig. 28b	BB103
Didymograptus incertus	Bouček (1973), text. fig. 28c	BB104
Didymograptus incertus		BB223
Didymograptus incertus	Bouček (1973), text. fig. 28e	BB106
Didymograptus minutus		BB272
Didymograptus minutus minutus	AD, nesouhlasí původní číslování B. Boučka (etik. č. 246, na kusu je č. 134)	BB75
Didymograptus minutus minutus	Bouček (1973), text. fig. 24b	BB87
Didymograptus minutus minutus	Bouček (1973), text. fig. 24d	BB88
Didymograptus minutus minutus	Bouček (1973), text. fig. 24c	BB89
Didymograptus minutus minutus	Bouček (1973), text. fig. 24a	BB86
Didymograptus nitidus stanislavi		BB387
Didymograptus nitidus stanislavi		BB398
Didymograptus nitidus stanislavi		BB379
Didymograptus nitidus stanislavi	Bouček (1973), text. fig. 11 d, e	BB29
Didymograptus nitidus stanislavi	Bouček (1973), Pl. V, fig. 5	BB31
Didymograptus nitidus stanislavi	Bouček (1973), text. fig. 11e	BB28
Didymograptus nitidus stanislavi	Bouček (1973), Pl. V, fig. 4	BB27
Didymograptus nitidus stanislavi		BB391

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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]