Parodia buiningii Mesemb but that is just a

but that is just a trademark name for the species

Haworthia arachnoidea Family: Xanthorrhoeaceae

It forms multiple heads in time but isn't a heavy clumper

dark green with white mottling

You will receive a plant  shown in image 4

Parodia buiningii Mesemb but that is just aParodia buiningii Also known as Notocactus. An attractive globular cactus with strong ribs and sharp spines. The spines are tricolored! They are black at the base, dark red in the middle, and yellow at the tips. I don't know of another cactus like it! Stays small and will clump in time. Produces big yellow flowers with a purple stigma. Requires general cactus care. Protect from frost. You will receive a plant shown in the last image or one similar.