| 11. | Most of the dendritic or many-branched types are classified as dendroid graptolites ( order Dendroidea ).
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| 12. | Graptolites with relatively few branches were derived from the dendroid graptolites at the beginning of the Ordovician period.
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| 13. | Graptolites with relatively few branches were derived from the dendroid graptolites at the beginning of the Ordovician period.
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| 14. | Gertrude Elles believed that " Pleurograptus " was the specific species to which the graptolites belonged.
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| 15. | This fossil shared many of the same characteristics as the sandy shales where Silurian graptolites are also found.
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| 16. | Since then, specimens from a different Victorian locality have been found that occur with veritable Late Silurian graptolites.
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| 17. | Others include brachiopods, cephalopods, trilobites, horn corals, snails, clams, echinoderms, and graptolites.
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| 18. | He studies trilobites and graptolites, especially those from the Ordovician, and their systematics, evolution and modes of life.
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| 19. | Other animals that inhabited Minnesota during the Ordovician included brachiopods, bryozoans, corals, crinoids, graptolites, and trilobites.
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| 20. | The extinct graptolites, colonial animals whose fossils look like tiny hacksaw blades, lived in tubes similar to those of pterobranchs.
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