The sclerites of "A. superstes" have right- and left-handed variants which are equally abundant, which suggests that "A. superstes" was bilaterally symmetrical. All of the sclerites were tiny: the palmate ones ranged from to in length, and the cultrates from to . The siculates fall into two groups: those with a shallow S-curve at the base, which range from to in length, and often have a slight twist at the base; and those with a 45° and 90° bend at the base and are to long.