How do articulate lamp shells obtain some nutrients from dissolved materials?

Articulate lamp shells, or brachiopods, primarily feed by using a lophophore—a specialized horseshoe-shaped organ—to filter minute organisms and organic particles from seawater.1

While this filtration process is their main method of gathering food, articulate brachiopods possess a blind intestine and may rely partly on the absorption of dissolved nutrients from their environment to supplement their diet.1