Nannotax Enabling nannofossil research

Description: Small, lenticular or rhomboid outline. No distinct flange ending. Two normally inclined pores in central-area.

Remarks:

Range: NN6 to 11. 

Variants:

• H. stalis ssp ovata Theodoridis, 1984 - outline rounded, lenticular, rather than rhombohedral;

• H. girgisii Varol, 1989 - closed central-area.