 However, because "Leuconia" has more than 2 million flagellated chambers whose combined diameter is much greater than that of the canals, water flow through chambers slows to 3.6 cm per "hour", making it easy for choanocytes to capture food.All the water is expelled through a single osculum at about 8.5 cm per "second", fast enough to carry waste products some distance away.In zoology a skeleton is any fairly rigid structure of an animal, irrespective of whether it has joints and irrespective of whether it is biomineralized.