This paper reports a novel light extinction pattern of polymers in a polarizing microscope, termed as looplike extinction by the authors. Such a phenomenon is found together with the Maltese cross, in the precipitation film of presheared poly(1,4-phenylene terephthalamide) (PPTA) solution, a popular lyotrophic polymeric liquid crystal. A plausible supermolecular structure is assumed, which comprises one +1 defect and a pair of -1/2 defects. The key structure is that besides the core of the nematic droplet, the matrix is also anisotropic due to preshearing. Calculated birefringence patterns find good agreement with the experimental micrographs.