| Nominal Species (n = 27) | Present allocation (n = 27) | Ref. |
|---|---|---|
| Monstrilla albatrossi Suárez-Morales, 2022 | Monstrilla albatrossi | 3477 |
| Monstrilla anglica Lubbock, 1857 | Monstrilla anglica | 19 |
| Thaumaleus bernardensis Willey, 1920 | Thaumaleus bernardensis | 19 |
| Monstrilla canadensis Mcmurrich, 1917 | Monstrilla canadensis | 19 |
| Thaumaleus claparedi Giesbrecht, 1892 | Thaumaleus claparedi | 19 |
| Monstrilla conjunctiva Giesbrecht, 1902 | Monstrilla conjunctiva | 19 |
| Monstrilla floridana Davis, 1949 | Monstrilla floridana | 19 |
| Thaumaleus gigas Scott, 1909 | Thaumaleus gigas | 19 |
| Monstrilla gracilicauda Giesbrecht, 1892 | Monstrilla gracilicauda | 19 |
| Monstrilla grandis Giesbrecht, 1891 | Monstrilla grandis | 19 |
| Strilloma longa Isaac, 1974 | Strilloma longa | 19 |
| Monstrilla longicornis Thompson, 1890 | Monstrilla longicornis | 19 |
| Monstrilla longiremis Giesbrecht, 1892 | Monstrilla longiremis | 19 |
| Monstrilla minuta Isaac, 1974 | Monstrilla minuta | 19 |
| Monstrilla nasuta Davis & Green, 1974 | Monstrilla nasuta | 19 |
| Thaumaleus pallidus Isaac, 1974 | Thaumaleus pallidus | 19 |
| Thaumaleus reticulatus Giesbrecht, 1892 | Thaumaleus reticulatus | 19 |
| Monstrilla rugosa Davis, 1947 | Monstrilla rugosa | 19 |
| Monstrillopsis sarsi Isaac, 1975 | Monstrillopsis sarsi | 19 |
| Monstrilla serricornis Sars, 1921 | Monstrilla serricornis | 19 |
| Monstrilla spinosa Park, 1967 | Monstrilla spinosa | 19 |
| Thaumaleus striatus Isaac, 1974 | Thaumaleus striatus | 19 |
| Thaumaleus tenuis Isaac, 1974 | Thaumaleus tenuis | 19 |
| Thaumaleus thompsoni Giesbrecht, 1892 | Thaumaleus thompsoni | 19 |
| Monstrilla viridis Dana, 1849 | Monstrilla viridis | 3477 |
| Monstrilla wandelii Stephensen, 1913 | Monstrilla wandelii | 19 |
| Thaumaleus zetlandicus Scott, 1904 | Thaumaleus zetlandicus | 19 |