(Photo: courtesy of Buck Richardson, Kuranda, Queensland)
This caterpillar initially attaches four sticks in a square around its case, all of the same length, and attaches them at right angles to the axis of the case. As the caterpillar grows: it keeps attaching a new set similarly arranged to the old set, except that they are slightly longer, so forming a larger square aligned with the previous four, so that the case grows like a pyramid.
This may the same species as Undetermined Psychid AF, but its case has a more regular construction and it may be the same species as Undetermined Psychid AH, just forgetting to add the twist for each layer of sticks.
(updated 22 April 2011, 24 September 2017)