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| Order | Family | English Common Name | Spanish Common Name | Portuguese Common Name | Scientific Name | Belonging | Conservation status | Notes | ||
| 1 | Araneae | Desidae | Metaltella simoni | Native | ||||||
| 2 | Filistatidae | Southern Crevice Spider | Araña de los Timbres | Aranha-das-fendas | Kukulcania hibernalis | Native | ||||
| 3 | Theridiidae | Viuda Parda | Latrodectus geometricus | Native | ||||||
| 4 | Scorpiones | Buthidae | Tityus argentinus | Native |
