• Length: mm

 • Description:

Simple corona of terminal feet around the truncate mouth, ovate abdomen, no ribs in the wall.

 • Pictures:

 • Links:

• Phormocyrtida images (by E.Haeckel, from the Kurt Steuber's Online Library)
• Calocyclas - from Technical Note on Cenozoic Radiolarian Stratigraphy (by Catherine Nigrini and Annika Sanfilippo), Ocean Drilling Program, Texas A&M University.