Centric
Stephanocyclus
- Central fultoportulae present
- Satellite pores (3) on central fultoportulae
- Marginal fultoportulae positioned on costae
- Rimoportula positioned on a costa
The genus is distinguished by features of the fultoportulae and rimoportulae. First, central fultoportulae are present, with three satellite pores. Second, marginal rimoportulae are positioned on a costa, between the valve face and valve mantle. Rimoportulae are located within the ring of marginal fultoportulae.
Stephanocyclus contains...