What was Monday’s mysterious mop of mini-hairs?

It was an extreme close-up of the abdomen of this animal:

A brown recluse spider, Loxosceles reclusa

Loxosceles reclusa, the brown recluse (St. Louis, MO)

The correct answer, #1, Loxosceles, was split between Guillaume (for genus) & Etienne (for number), who each receive 5 points.

The SEM image is a public domain file from CDC’s public health image library.