Cyrtodesmus lobatus is a species of millipede in the family Cyrtodesmidae that is endemic to San Vito, Costa Rica, where it was found on April 19, 1972.
Their lateral keels are flaring from the third segment and middle of the body and ending on the sides of metazonites.
The surface is the same for all segments that don't have setae or spicules, but is coated everywhere else with organic matter, which is quite thin on tubercles of the apex part.
Species head have thick, oblique, and short ridges on the interantennal parts, while they themselves are dark coloured, with a deeply narrow but separated channel.
It also has a free and raised squared corner, which is located next to the antenna.