Lower Mississippian sponges from the Edwardsville Formation, southern Indiana

J. K. Rigby, and W. I. Ausich

1981

Article

Journal of Paleontology 55(2):370-382

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Taxa discussed in this work:

• Hydnoangulus
• Hydnoangulus quadratus
• Hydriodictya cyclix

Taxonomy:

• Hydriodictya cyclix belongs to Hydriodictya - Hall and Clarke (1899)
• Hydnoangulus quadratus belongs to Hydnoangulus - Rigby and Ausich (1981)