Pleurae with four, rarely five pleural ribs evenly curved backwards distally.
Pygidium transverse, trapezoidal in outline, with five faint axial rings and up to three weakly defined pleural ribs.
Pleural fields gently sloping outwards, with up to three weakly defined pairs of pleural ribs more clearly expressed on the internal moulds.
an effaced, transverse pygidium trapezoidal in outline with axial and pleural ribs expressed mainly on the ventral side of the sclerite, and a gently convex posterior margin between marginal pygidial spines.
preglabellar field, a glabella almost lacking segmentation, significantly larger palpebral lobes, a transverse pygidium with weakly defined axial rings and pleural ribs, expressed mainly on its ventral side, an axis terminated in the proximity of the posterior pygidial margin and short, stout pygidial marginal spines with a gently convex posterior margin between them.
In the description, counts of vertebrae and pleural ribs were taken from cleared and stained (c&s) of one male and one female paratypes, prepared according to Taylor & Van Dyke (1985).
Anal fin origin between the pleural ribs of vertebrae 8 in males, and the pleural ribs of vertebrae 10 and 11 in females.