Dyakiidae is a family of air-breathing land snails terrestrial pulmonate gastropod mollusks in the superfamily Trochomorphoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

[4] The family also includes the only known terrestrial gastropods to emit light.

The stomach is very simple with weak muscles (as is the case in the majority of land snails).

[4] (These anatomical characteristics also include the family Staffordiidae which was considered part of the Dyakiidae at the time the study was done).

The family Dyakiidae includes the following genera, with a steadily increasing number of described species (71 species until 2007[7] + 11 new species in 2009[8]): The following cladogram shows the phylogenic relationships of this family and superfamily with the other families within the limacoid clade:[12] Staffordiidae Dyakiidae Pristilomatidae Chronidae Euconulidae Trochomorphidae Gastrodontidae Oxychilidae Trigonochlamydidae Parmacellidae Milacidae Zonitidae Helicarionidae Ariophantidae Urocyclidae Vitrinidae Boettgerillidae Limacidae Agriolimacidae Media related to Dyakiidae at Wikimedia Commons