[2] Micranthocereus estevesii is a rare cactus species with columnar, bluish-green shoots that can reach up to 6 meters in height and 15 centimeters in diameter.

It has 37 to 42 narrow ribs, round areoles with yellowish-brown wool and hair, 6 to 7 slightly curved central spines that are light brown and 0.2 to 3.5 centimeters long, and approximately 12 needle-like, light brown marginal spines that are 5 to 11 millimeters long.

The broad, funnel-shaped flowers are white and open at night, measuring up to 3.5 centimeters in length and diameter.

This species was first described as Austrocephalocereus estevesii in 1974 by Albert Frederik Hendrik Buining and Arnold J.

[4] The specific epithet honors Brazilian cactus specialist Eddie Esteves Pereira, who discovered the species.