Sparganophilus, the only genus in the family Sparganophilidae, is a group of long, slender, limicolous (mud-dwelling) earthworms native to North America.

The number of species is unknown, most of them are undescribed, throughout the continent and into Central America.

One species, S. tamesis, has been introduced into the streams of Europe, where it is now widespread; its synonyms are S. eiseni, S. benhami, S. guatemalensis, S. carnea, S. elongatus, S. cuenoti and, newly, S.

[1][2][3] Sparganophilus species are characterised by a simple gut with no gizzard and no typhlosole.

They feed in the low oxygen mud and organic material, but with their highly vascularized posterior region on or near the surface.