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Pseudocoelomates and a Nemertine from the Illinois Pennsylvanian
Frederick R. Schram
Journal of Paleontology
Vol. 47, No. 5 (Sep., 1973), pp. 985-989
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1303083
Page Count: 7
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Four species of soft bodied worms are described from the Mazon Creek area, Middle Pennsylvanian, of Illinois. They are assigned to four phyla, three at the pseudocoelomate grade of organization: Priapulida (Priapulites konecniorum), Nematoda (Nemavermes mackeei), and Chaetognatha (Paucijaculum samamithion); and to the phylum Nemertina (Archisymplectes rhothon). These Mazon Creek worms are very similar to their living relatives. The fossils display the ancient origins of these phyla which are now seen to have existed virtually unchanged since at least the Middle Pennsylvanian.
Journal of Paleontology © 1973 SEPM Society for Sedimentary Geology