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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

Pristiograptus ultimus SM164
Pristiograptus ultimus SM206
Pristiograptus ultimusfoto YA31
Pristiograptus ultimus SM163
Pristiograptus ultimus SM165
Pristiograptus ultimus SM212
Pristiograptus variabilisŠtorch, (2001), text. fig. 7, fig. 17, 18 PŠ1038
Pristiograptus vulgaris p1759
Prochnygraptus crispusŠtorch (1985), Pl. II. fig. 1 PŠ213
Prochnygraptus singularisPøibyl a Štorch (1985), text. fig. 3a PŠ217
Prochnygraptus singularisPøibyl a Štorch (1985), text. fig. 3b PŠ219
Prochnygraptus singularis PT30
Prochnygraptus singularisPøibyl a Štorch (1985), text. fig. 3c, Pl. II, fig. 2 PŠ218
Pseudoclimacograptus hughesi BB650
Pseudoclimacograptus hughesi BB643
Pseudoclimacograptus hughesi BB644
Pseudoclimacograptus hughesi BB645
Pseudoclimacograptus hughesi BB647
Pseudoclimacograptus hughesi BB651
Pseudoclimacograptus BB646
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]