A simple type of sponge body structure where water flows directly from the outside through pores into a central cavity and out through an opening.
From Greek askos (wineskin, bladder, referring to the simple sac-like shape). The term was developed in the 19th century by zoologists studying sponge anatomy and classification.
An ascon sponge is nature's simplest filter-feeder design—it's literally just a tube with holes, and it's so efficient that this 600-million-year-old body plan is still used by many sponges today.
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