The Archaeocyatha are sessile conical animals that resemble hollow horn corals found in Lower Cambrian sediments. The structure is something like a pair of perforated, nested ice cream cones. Many modern authors treat them as Porifera (sponges). Archaeocyathans were important reef builders in their time. Flow tank experiments suggest that their morphology allowed them to exploit flow gradients to passively pump water through the skeleton, as in modern sponges.
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