Growth Habits: Small, solitary when young, slightly clumping with age.up to 1 1\2 inches (4cm) tall, 1\2 inch (8 to 12mm) diameter although plants in cultivation can grow a little larger.
Scientific name; Turbinicarpus pseudomacrochele ssp. minimus
Common names: None that come to mind.
Synonym: Turbinicarpus krainzianus ssp. minimus, Turbinicarpus krainzianus var. minimus, Turbinicarpus krainzianus, Turbinicarpus pseudomacrochele ssp.krainzianus
Etymology: The name is derived from the Latin turbineus, meaning shaped like a spinning top, and the Greek karpos, which refers to the fruit.
pseudomacrochele: Similar to macrochele.
macrohele: Large-clawed, referring to the claw like spination.
minimus: Smaller than usual.
Origin: Mexico (Hidalgo)
Light: Full sun to light shade.
Compost. A free draining standard cactus mix.
Water: Regular water in spring to autumn when juvinile, less in the adult stage.
Flower: The flower colour is yellow outer petals often have mid stripe.
Min temp: Hardy to 25°F (-4°C), for short periods.
Cultivation: Easy to grow and remains a very small plant.
Comments: first a few notes on the plant, it has a tuberous root system and if you look at the lower stem you can see the juvenile spine formation devoid of central spines along with the adult spine formation on the top with papery central spines.
secondly a note on taxonomy,this particular plant seems to be a minefield of what is Scientific name and what is Synonym, i finally took my reference from the book Ariocarpus et cetera Published in 2006.
top image showing the mid stripe in the flowers.
