Thorn orb weaver (Micrathena schreibersi) ♀
Micrathena schreibersi has one of the longest posterolateral spines among all the Micrathena that I found. There are 4 pairs of black spines on the abdomen and a small pair of blunt spines overhanging the abdomen. The carapace has a yellow rim, an anterior pair of dimples and distinct pairs of grooves radiating from the circular thoracic depression.
From 2015 Peru Macro