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TABLE 1. Calculation of the Re in the most distal (aboral) portion of the hydrospire, corresponding to the first eight hydrospire pores, in living Pentremites rusticus and in the 72x scale model.

 Pentremites rusticus Model If the cilia are in pore canals If the cilia are in the folds Pore canal parameters Pore diameter, m 25.4x10-6 25.4x10-6 1.85x10-3 Pore area, m2 5.1x10-10 5.1x10-10 2.69x10-6 Pore velocity, m/s 6.0x10-4 † 0.040 3.2x10-3 Volumetric flow rate, m3/s 3.0x10-13 2.0x10-11 6.9x10-8 Hydrospire fold parameters Fold spacing, m 4.3x10-5 4.3x10-5 0.0031 Distance between adjacent pores, m 2.65x10-4 2.65x10-4 0.0153 Area of folds between adjacent pores, m2 3.4x10-8 3.4x10-8 1.42x10-4 Hydraulic diameter, m 8.6x10-5 8.6x10-5 0.0062 Velocity in folds, m/s 9.0x10-6 6.0x10-4 † 61x10-6 Kinematic viscosity, m2/s 1.8x10-6, 0°C seawater 1.8x10-6, 0°C seawater 1.0x10-6, 25°C freshwater 9.4x10-7, 25°C seawater 9.4x10-7, 25°C seawater Reynolds number in folds 0.0004 at 0°C 0.03 at 0°C 0.376 0.0008 at 25°C 0.05 at 25°C † Cilia velocity from (Paul, 1978)