I see what you mean with the side patterns, almost as if they're trying to expand in all directions as much as possible, and swallow the darker background.

The lighting on the pics was exactly the same for all of them. Overhead lamp, and I may have used the flash as well, but the whole clutch was under the same conditions for the pics.

Here are both sides of that hold back spider, under sunlight, no flash.



The one side has seriously reduced background coloration showing through, as if the pattern was trying to expand and obliterate/take over all of the background color, more so than what the spider gene itself does. And I dare say, that while her cream/brown colors have dulled a bit over the last year, there seems to be a bright, burnt orange showing through the dulling/darkening cream/brown? I also kept this spider back, because there seems to be a white coloration trying to show through along the spine, more so on some of the others that I didn't keep back, but the mother, and this one have it as well, although I'm not sure if that is just a common thing with some spiders?

Looking at the mother, based on what you said about her also having large blocks, I wonder if the mother hasn't got something going on as well, which has subtly been showing through in the young all this time, but only now with this weird OS hitting just the right odds, it's become noticeable?

Pity that all these (mother, spider and OS) are females, and the only related male is the stinger bee, which I also kept back because of the low amount of background color, but I'm loath to do a stinger x spider pairing, but maybe stinger x OS might be worthwhile?

I've asked the chap who I got the mother from if he can find out what it's lineage is, seeing as he got it as an adult, and then I took it over when he was removing spiders from his gene pool. But, I'm not holding my breathe for any answers to that Q.