(8)
Zygodiscales (2)
Helicosphaeraceae (1)
Helicosphaera (4)
H. carteri group (10)
Helicosphaera pavimentum
Description: Small to medium sized. Flange narrow without distinct wing. Central-area with two small in-line pores.
Remarks: A distinctive extant species but rarerly recorded from fossil record
Range: NN19? to 21.