Graptoloid 0.0 / 5 ? GeologyFossilsA2/A-levelOCR Created by: HannahCavielCreated on: 10-04-17 12:27 Sicula conical tube secreted by the first member of the colony 1 of 15 rhabdosome the entire graptoloid skeleton 2 of 15 stipe a branch off of the rhabdosome 3 of 15 virgella spine at the end of the sicula 4 of 15 aperture of the sicula where the first zooid protruded from the skeleton 5 of 15 theca individual cup in which one zooid lived 6 of 15 mode of life lived within the water column and were pelagic. most conformed with a planktonic life by floating using their nema attached to something 7 of 15 nema long extension of the sicula, believed to have attached to a floating object 8 of 15 phylum hemichordata 9 of 15 order graptoloidea 10 of 15 class graptolithinia 11 of 15 order of evolutionary graptolite tetragraptus. didymograptus, didymograptus. dicellograptus, diplograptus and monograptus 12 of 15 changes in stipes from ordovician to silurian many stipes to very few stipes 13 of 15 changes in the shape of thecae from ordovician to silurian simple theca to complex theca 14 of 15 direction of theca pendent (downwards) to scandent (upwards) 15 of 15
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