Aqabarella urdunensis has an almost smooth embryonic shell that measures 0.1 mm. The larval shell added to it consists of almost two whorls ornamented by weakly sinuous growth lines and strong ribs which follow the outline of the aperture. The teleoconch consists of up to 2.5 whorls with a varix after two whorls. The aperture of the fully grown shell is thickened with continuous rounded outer lip and weakly convex inner lip. Teleoconch ornament is of 6 strong spiral ribs of
which only two are not covered by the body whorl and rounded minor spiral ribs between
them.

SEE DESCRIPTION OF THE GENUS!

The shell of Aqabarella urdunensis resembles that of Haloceras regarding the teleoconch, but not regarding the protoconch. The larval shell of Haloceras is described as being predominantly ornamented by simple spiral ribs, but in general shape they are low trochospiral as is the case here, but much larger. Also similar in regard to teleoconch shape is Alvania (Galeodina), but here the protoconch has the characteristic stripes on the embryonic shell as found among the Rissoidae. The characteristic protoconch of the two species of Aqabarellidae from the Gulf of Aqaba resembles that of some fossil species, the oldest of which belong to the Pseudozygopleuridae Knight, 1930 and occurred during the Carboniferous and Permian. Also the Triassic Cassianozyga seelandica Bandel, 1991 that lives in the tropical reef environment
of the Tethys Ocean has similar protoconch shape and ornament,and also in the Jurassic Sea a species determined as Buvignierina had a similar protoconch.