Single-layer microfluidic device for trapping individual Aiptasia larvae. (A) Design schematic for ‘Traptasia’ device containing an array of 90 triangular traps and tubing inlets. The final PDMS device is bonded to a No. 1 coverslip for imaging. (B) SEM image of PDMS device showing trap array. (C) SEM image of a single trap with labeled dimensions. (D) SEM image of trap aperture walls.