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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

Didymograptus PB712
Didymograptus PO33
Didymograptus VL2068
Didymograptus spinulosus BB311
Didymograptus spinulosus BB224
Didymograptus spinulosus XA778
Didymograptus spinulosus BB313
Didymograptus spinulosusBouček (1973), text. fig. 27b BB102
Didymograptus spinulosusBouček (1973), text. fig. 29g BB101
Didymograptus vacillanoidesBouček (1973), text. fig. 25e, f, g BB95
Didymograptus vacillanoides BB325
Didymograptus vacillanoidesBouček (1973), Pl. XV, fig. 5, text. fig. 25d BB94
Didymograptus vacillanoides BB364
Didymograptus vacillanoides BB242
Didymograptus vacillanoidesBouček (1973), text. fig. 25a BB92
Didymograptus vacillanoidesBouček (1973), text. fig. 25b BB93
Didymograptus vacillanoides BB243
Dimorphograptus confertus BB594
Dimorphograptus erectus Elles & Wood, 1908Štorch (2023), Fig. 6F PŠ4367
Dimorphograptus BB614
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]