| 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 auctus Rickards, 1965 | Manda et al. (2019) Fig. 9D; Štorch & Manda (2019) Fig. 5i,j, 6a | | | PŠ3848 | Pristiograptus auctus Rickards, 1965 | Manda et al. (2019) Fig. 7A, 9E; Štorch & Manda (2019) Fig. 5k | | | PŠ3839 | Pristiograptus bjerringus (Bjerreskov, 1975) | Štorch (2023), Fig. 12G - PŠ4351 / 1 | | | PŠ4351 | Pristiograptus bohemicus | | | | p5269 | Pristiograptus bohemicus | | | | JK7275 | Pristiograptus bohemicus | | | | JK7274 | Pristiograptus bohemicus | | | | JK7276 | Pristiograptus bohemicus | | | | JK7273 | Pristiograptus bohemicus | | | | p405 | Pristiograptus bohemicus | | | | p396 | Pristiograptus bohemicus | | | | JK7277 | Pristiograptus bohemicus | | | | p385 | Pristiograptus concinnus | | | | PŠ240 | Pristiograptus concinnus | Štorch (1988), Pl. IV, fig. 4 | | | BB637 | Pristiograptus concinnus | | | | PŠ210 | Pristiograptus concinnus | Štorch (1988), Pl. IV, fig. 2, 3, text. fig. 2B | | | PŠ264 | Pristiograptus concinnus | Štorch (1998), Pl 11, fig. 3 | | | PŠ775 | Pristiograptus deubeli | AD Manda et al. (2019) | | | PŠ3842 | Pristiograptus deubeli | Štorch (2023), Fig. 20F | | | PŠ4369 | Pristiograptus deubeli | AD Manda et al. (2019) | | | PŠ3840 |
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