The unique Pennsylvanian nautilid Solenochilus springeri is described with reference to material from the lower Cherokee Group (Atokan or Desmoinesian) of Marion County, Iowa, and the Bloyd Formation (Morrowan) of northwestern Arkansas. The species was based originally on a specimen, now lost, from Adair County, Iowa; a neotype is selected from the Marion County collections. The detailed morphology of the pair of dorsolateral spines which characterize mature Solenochilus is described for the first time. These spines, whose length approximates the width of the mature body chamber, are hollow throughout. Each spine originated as a lateral expansion of a prominent dorsolateral ridge located on the umbilical shoulder.
Proceedings of the Iowa Academy of Science
© Copyright 1966 by the Iowa Academy of Science, Inc.
Mikesh, David L. and Glenister, Brian F.
"Solenochilus Springeri (White & St. John, 1868) from the Pennsylvanian of Southern Iowa,"
Proceedings of the Iowa Academy of Science, 73(1), 269-278.
Available at: https://scholarworks.uni.edu/pias/vol73/iss1/39