aboral

Since the power stroke of comb plates is directed aborally (in the opposite direction to the antiplectic metachronal waves), this asymmetric pattern of activity of the lower versus upper rows would cause a free animal to turn with its mouth facing upward (Tamm, 1980, 1982, 2014a).

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.

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.

To determine whether the geometric proportions or Cartesian coordinates of the statolith, as viewed aborally, change with increasing body size, the ratio of the major to minor axes (a/b) was plotted as a function of body length (not shown).

In lateral view the platform is practically straight, but slightly bent aborally in the posterior region.