The flatties: wall crab spiders compressed nearly two-dimensional, pressed against bark and stone, and holders of one of the fastest measured turning strikes in the animal kingdom. Prey walking past a flattie simply stops existing in the direction it was going.
Keeping is vertical and simple: broad bark slabs or stone, tight crevices, cross ventilation, and prey released onto the surface. Not medically serious. The speed is the containment consideration, because an open enclosure is an invitation the animal accepts instantly.
Supply is thin wild collection across the warm Americas and beyond, identification is loose, and the trade is small. The genus sells the strike and the silhouette, and it delivers both. Among true spiders it is one of the strongest watchability-per-dollar propositions available, kept obscure mainly by how rarely anyone offers it.
The line on each tile: lowest ask per day.
Rarity BETA Rarity is supply, and only supply: the tier is how many sellers have ever carried a species, and for a single seller, how many separate listings. Price is not part of it, and neither is how recently it appeared. Tiers are given to tarantula species only.