| Willemia buddenbrocki Hüther, 1959 |
| Willemia bulbosa Bonet, 1945 |
| Willemia intermedia Mills, 1934 |
| Willemia persimilis Bonet, 1945 |
| Willemia similis Mills, 1934 |
| Xenylla Tullberg, 1869 |
| Xenylla acauda Gisin, 1947 |
| Xenylla baconae Folsom, 1916 |
| Xenylla californica da Gama, 1976 |
| Xenylla canadiensis Hammer, 1953 |
| Xenylla carolinensis Wray, 1946 |
| Xenylla cavernarum Jackson, 1927 |
| Xenylla christianseni da Gama, 1974 |
| Xenylla duchesnea Wray, 1958 |
| Xenylla grisea Axelson, 1900 |
| Xenylla humicola (Fabricius, 1780) |
| Xenylla nitida Tullberg, 1871 |
| Xenylla proxima Denis, 1931 |
| Xenylla pseudomaritima James, 1933 |
| Xenylla simberloffi da Gama, 1974 |