Phereoeca uterella, known by the vernacular names plaster bagworm[a] and household casebearer[b], is a moth species in family Tineidae.

[4] In the Americas, it has been recorded from Brazil, Guyana, and the southern United States[1] as well as the Virgin Islands and Trinidad,[4] and tentatively identified from Tobago.

[4] As with other species of its genus, Phereoeca uterella has been the subject of taxonomical confusion,[4][5] some of which is not yet fully resolved.

The larva constructs a protective case from silk and camouflages it with other materials such as soil, sand and insect droppings.

When the larva is fully grown, this case is up to 14 mm long (twice the length of the animal) and is noticeably thickened in the middle so that it rather resembles a pumpkin seed.