Arthropods have specialized cells in the green gland that are ameboid and aid in digestion.
Solid material sticks to a mucous track and is carried to the mouth by cilia where it is ingested. 15-5 spiders use also sucking as their digestive means but instead of limited internal digestion, they inject digestive enzymes into the prey and allow the exoskeleton to contain the juice as internal body parts are liquified. Seizing food and Trituration - breaking up food mechanically. Teeth, claws, gizzards, etc. Grazing - done with a radula as in molluscs and grinding tough plant food with molars.