Help in identifying an unknown arthropod
It is the larva of household casebearer moth (a Lepidoptera), named after the larval stage. It is scientifically called Phereoeca uterella.

It is found through out South and North America.






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


References:


Wikipedia
bugguide




Further reading: Household Casebearer, Phereoeca uterella by
Juan A. Villanueva-Jimenez and Thomas R. Fasulo