|Chamidae, the jewelboxes, have thick, irregular, somewhat circular to oval shells. The surface of the shell is rough and usually have long or short leafy, plate-like or spiny projections. Some attach to hard substrates, and some are free swimming. Most are usually attached to a hard substrate, though maybe temporarily, at some point in their life. The cemented lower valve is usually larger and deeper than the upper valve. Some can have vivid colors while others are just bland. There are 6 species in Texas waters.