It is monotypic, containing the sole species Paraprostatum echinolittorinae[1] It is found within Mexico and Central America.

The genus Paraprostatum is distinguished from other Euplanids by a pharynx anterior to the mid-body or centrally oriented, the presence of eye spots, a potential lacking of nuchal tentacles or tentacular knobs, the presence of a stylet in the male copulatory apparatus that is joined to the proximal seminal vesicle, and the lack of a Lang's vesicle.

[2] The species has been observed in the mantle cavities of several gastropods, having been found in several areas in Mexico and Central America.

It has been found on coasts along this region such as Puerto Ángel and Playa de los Muertos in Mexico, Tárcoles, Manuel Antonio National Park and Guanacaste in Costa Rica, and the La Chocolatera cliff of Salinas in Ecuador.

[2] P. echinolittorinae has been observed to practice commensalism with several gastropod species, occupying their mantle cavities.