Diagnosis
Cells elongated, with a pentagonal to pyriform shape in ventral view,
and moderately dorsoventrally compressed. The lateral sides of the
epitheca and hypotheca are slightly convex. The epitheca is tapering
into a robust apical horn. The first apical plate (1’) is orthogonal and
symmetrical. The second apical intercalary plate 2a and the third
intercalary plate 3a are asymmetrical and pentagonal, plate 1a is
quadrangular and has approximately triple times smaller area than plate
3a. The cingulum is equatorial, displaced, descending by about 0.5–0.75
of its width, not excavated, and bears lists. The sulcus is wide,
shallow, with lists, and slightly oblique. The hypotheca possesses two
long slender antapical horns, which are slightly divergent (the right
one slightly longer than the left). Dimensions: length 143 ± 2 µm (min.
140 µm, max. 145 µm, n = 30), width 61 ± 1 µm (min. 60 µm, max. 63 µm, n
= 30), and depth 37 ± 2 µm (min. 35 µm, max. 40 µm, n = 30).