Spiny-backed orb weaver With yellow and black markings
Great photo! Yes, this is Gasteracantha cancriformis. This photo explains to me why my ventral photos of them at dusk ended up looking like the birth of a galaxy.
Wow, fantastic photo! I have never seen G. cancriformis in these colors!
I was just looking through my photos of them. They really vary ventrally depending on the light. I suspect that the markings are visible under UV light. Nocturnal insects that can see UV wouldn’t see the spider, just the dots. In regular sunlight in the woods the ventral side just looked like a black piece of debris, like a tree seed. At dusk, with flash, they glow white, yellow, and red. I just posted a photo that shows some of the glowing appearance. This photo is a different aspect than either. The ventral surface is dark blue!
I used a flask on this shot and did pick up some strong reflections from what appears to be very small white or translucent flecks. It could be pollen or more likely the coating from a moth’s wing. I observed him wrapping up a moth several minuets earlier.
This is without a flash.