Riella affinis M. Howe & Underw. species accepted

Riella alatospora Wigglesw. species accepted

Riella americana M. Howe & Underw. species accepted

Riella battandieri Trab. species accepted

Riella bialata Trab. species accepted

Riella capensis Cavers species accepted

Riella choconensis Hässel species accepted

Riella cossoniana Trab. species accepted

Riella cyrenaica Maire species accepted

Riella echinata (Müll. Frib.) Segarra, Puche & Sabovlj. species accepted

Riella gallica Balansa ex Trab. species accepted

Riella gamundiae Hässel species accepted

Riella halophila Banwell species accepted

Riella helicophylla (Bory & Mont.) Mont. species accepted

Riella heliospora Segarra, Puche & Sabovlj. species accepted

Riella indica Steph. ex Kashyap species accepted

Riella mediterranea Segarra, Puche, Sabovlj., M. Infante & Heras species accepted

Riella notarisii (Mont.) Mont. species accepted

Riella numidica Trab. species accepted

Riella pampae Hässel species accepted

Riella parisii Gottsche species accepted

Riella purpureospora Wigglesw. species accepted

Riella reuteri Mont. species accepted

Riella spiculata J. Taylor species accepted

Riella trigonospora Segarra & Puche species accepted

Riella undulata Hässel species accepted

Riella echinospora Wigglesw. species accepted

Riella macrocarpa (P. Allorge) Puche, Segarra, Sabovlj., M. Infante & Heras species accepted

Riella sersuensis Trab. species accepted