Pa element lateral side: straight main body or slightly bent
aborally in its posterior region.
Gonopod: Telocoxite with distal lamella, medial lamella and
aborally directed lateral lamella with small teeth and a larger, arched hook (Fig.
The posterior process has small denticles and widens
aborally. The lateral process is the longest, bearing fused denticles.
Secundibrachials slightly cuneate uniserial, same approximate dimensions and same distal expansion as on primibrachials,
aborally rounded.
While swimming, their tentacles were extended
aborally in the direction of movement.
Thereafter, no plates are added to the oral surface; new plates can only be generated
aborally, and the aboral plates do not migrate around the margin to the oral surface.
The lower comb rows beat faster than the upper rows, with ciliary power strokes directed
aborally, when the animal turns to swim mouth upward (negative geotaxis).
In lateral view the platform is practically straight, but slightly bent
aborally in the posterior region.
Viewed
aborally, metaplica short with concave apical surface such that lateral margin is curled outwards brevilobata (Attems, 1928)