It’s only a picture of a small part of Jupiter’s surface, twisted into a circular image. [This](http://www.mikesalway.com.au/wp-content/uploads/2009/05/20090506_1836-mikesalway.jpg) is what a full hemisphere picture of Io’s shadow on Jupiter looks like. Notice the large “white” stripes across the equator and how only one or two of them are shown in the picture you linked.
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