Signature Spider Stabilimentum

This Argiope luzona is a very young female. I used to have difficulty in differentiating young females of this species from the males, but I discovered (on the scientific paper mentioned in Notes below) that it is really quite simple. The male's cephalothorax is always bigger than its abdomen, but the female's cephalothorax is always smaller than its abdomen. Now, on to the main purpose of this series of spottings, the Stabilimentum. This one is classified as a "Discoid Stabilimentum". The authors of the scientific paper determined that smaller spiders (body size < 6 mm) produced mainly Discoid Stabilimenta and larger individuals (body size > 6 mm) produced strictly Cruciate Stabilimenta. This kind of information makes everything much easier to understand.