SCIENTIFIC PORTAL FOR ALL USERS INTERESTED IN PTEROBRANCHS AND GRAPTOLITES
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Middle Cambrian pterobranchs and the Question: What is a graptolite?
J. Maletz, M. Steiner and O. Fatka
Lethaia 38 (2005), pp. 73-85
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The presence of distinct fusellar structure is taken as evidence to include a number of fossils from the Middle Cambrian to the Lower
Ordovician of North America and Europe with the Pterobranchia. The dome of the pterobranchs and the prosicula of the planktic
graptolites are contrasted and evidence is given for the re-assignement of a number of well known dendroid graptolites to the
pterobranchs. A non-destructive method is described to reveal fusellar development of delicate hemichordate exoskeletons from
shales. Rhabdotubus robustus n.sp. from the Czech Republic and a ?Cephalodiscus sp. from the Wheeler Shale of North Americe
are described as new Middle Cambrian pterobranchs.
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