The eyes are small and arranged along the body margins in a single row from the anterior to the posterior end.

The parenchymal musculature includes weak longitudinal muscles generally restricted to a ventral plate and very strong dorso-ventral muscles that give the planarian its quadrangular shape.

The copulatory apparatus has a penis papilla and lacks adenodactyls or other accessory glands.

[1] The name Reomkago is a combination of the initials of Robert E. Ogren (REO) and Masaharu Kawakatsu (MK) with the sufix -ago, from Greek ἄγω, to guide.

The genus honors the two scientists for their work in indexing the species of land planarians.