The species name is derived from the Latin word crenulatus (meaning minutely notched) and refers to the heavily scalloped posterior margin of male.

The plant has an erect and stately habit, forming a clump of rich grassy-green, ovate leaves with scalloped margins.

The hindwing has a scalloped margin and no tail.

The whitish to pale brownish conical shell is 6 to 13 mm long on a broadly oval base with an irregularly scalloped margin.

The entrance wound on her back has a characteristic scalloped margin, and there are additional satellite lesions as individual pellets separated from the main mass.

Margins toothed, without teeth or with scalloped margins.

The wings have scalloped margins.

The tree is slim in profile, with yellow-green lanceolate (lance-shaped) leaves with scalloped margins.

Adults are brown with a pale scalloped margin to each wing.

The hindwing has a scalloped outer margin and a large androconial hair-pouch on the anal margin of the male.