Another very extensive and diffuse spiral

https://www.legacysurvey.org//viewer/?ra=30.6826&dec=-6.5629&layer=hsc-dr2&zoom=14

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very beautiful, and another line segment flocculent type galaxy(where the spiral appear segmented instead of smoothly logarithmic), why might that occur?

if the central mass causes log spirals, why does it sometimes pinwheel?