It is represented by a single currently accepted species, Dinema polybulbon, native to Mexico, Central America, and the Caribbean.

[2] They are epiphytes or lithophytes; with pseudobulbs 10 mm long and 6 mm wide, spaced 1–1.5 cm apart on the creeping rhizome, slightly compressed, yellowish-green, apically bi-foliate.

The fruits are ellipsoid capsules[3] It is found in Mexico, Belize, El Salvador, Guatemala, Honduras, Nicaragua, Cuba and Jamaica.

Uncommon species in habitat, found in humid mixed forests, at an altitude of 1000–1400 meters; it blooms in November, and bears fruit in August.

This species can be recognized by the small size, the relatively large solitary flowers, the simple white to yellowish-white lip, and the cornicle-shaped extensions of the column.