caddis worm

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cad·dis·worm

or caddis worm  (kăd′ĭs-wûrm′)
n.
The aquatic wormlike larva of a caddisfly, enclosed in a cylindrical case covered with grains of sand, bits of wood or shell, or other debris.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

caddis worm

or caddis
n
1. (Animals) the aquatic larva of a caddis fly, which constructs a protective case around itself made of silk, sand, stones, etc. Also called: caseworm or strawworm
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014