 There are five types of thecae ornamentation in this genus.Type A is a smooth theca or a theca with shallow depressions, a single row of pores lines the anterior and posterior cingular lists and the margins of the large epithecal and hypothecal plates.Type B has a more pitted thecal surface but has fewer pores; Type C is characterized by shallow hexagonal reticulation in the theca and a pore in the middle of each areola.