The pattern on the back of the abdomen of a plump (fertile) jumping spider.
I don’t have much today, just this pregnant jumping spider’s lovely abdominal pattern.
Spider Back Thursday
BugPhoto.net
featuring photography of insects, spiders, arthropods and other macro subjects.
BugPhoto.net 
You seem to be very fond of jumping spiders.
That is true. I will say, the jumping spiders I encounter are often on man-made structures like railings and brick walls and windows, which provide sturdy surfaces to brace myself and my camera; so apart from their natural beauty and wonder they are easy quarry compared to many other arthropods. And as far as arthropod photographers go, I’m fairly unoriginal in that I’m a sucker for the big eyes.