| 2021-11-12 | New taxonomic reference entry | Latrodectus geometricus C. L. Koch, 1841 | Africa. Introduced to both Americas, Middle East, Pakistan, India, China, Japan, Thailand, Malaysia, Papua New Guinea, Australia, Hawaii | | Cabrera-Espinosa & Valdez-Mondragón, 2021 |
| 2021-11-12 | New taxonomic reference entry | Latrodectus hesperus Chamberlin & Ivie, 1935 | Canada, USA, Mexico. Introduced to Israel, Korea | | Cabrera-Espinosa & Valdez-Mondragón, 2021 |
| 2021-11-12 | New taxonomic reference entry | Latrodectus mactans (Fabricius, 1775) | Probably native to North America only. Introduced to South America, Asia | | Cabrera-Espinosa & Valdez-Mondragón, 2021 |
| 2021-11-12 | Reference included | | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina rufescens (Mello-Leitão, 1940) | Guyana | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina selenopoides Banks, 1929 | Costa Rica, Panama | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina saaristoi Jäger, Rheims & Labarque, 2009 | Venezuela | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina pumilla (Keyserling, 1880) | Colombia | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina parang Rheims, 2011 | Trinidad and Tobago | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina milleri (Caporiacco, 1955) | Venezuela | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina gaita Rheims, 2011 | Venezuela | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina deltshevi Jäger, Rheims & Labarque, 2009 | Venezuela | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina adisi Jäger, Rheims & Labarque, 2009 | Venezuela | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina soca Rheims, 2021 | Trinidad and Tobago | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Sparianthina boyaca Rheims, 2021 | Colombia | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Sparianthina soca Rheims, 2021 | Trinidad and Tobago | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Sparianthina boyaca Rheims, 2021 | Colombia | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana urucu Rheims, 2010 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana tambopata Rheims, 2010 | Peru | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana quillu Rheims, 2010 | Ecuador | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana panguana Rheims, 2010 | Peru | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana neblina Rheims, 2010 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana manauara Rheims, 2010 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana arawak Rheims, 2021 | French Guiana | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana muirpinima Rheims, 2021 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Guadana arawak Rheims, 2021 | French Guiana | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Guadana muirpinima Rheims, 2021 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana mapia Rheims, 2021 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana amendoim Rheims, 2021 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana ucayali Rheims, 2021 | Peru | | Rheims, 2021 |
| 2021-11-12 | New taxonomic reference entry | Guadana alpahuayo Rheims, 2021 | Peru | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Guadana mapia Rheims, 2021 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Guadana amendoim Rheims, 2021 | Brazil | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Guadana ucayali Rheims, 2021 | Peru | | Rheims, 2021 |
| 2021-11-12 | New species inserted | Guadana alpahuayo Rheims, 2021 | Peru | | Rheims, 2021 |
| 2021-11-12 | Species distribution update | Heliophanus apiatus Simon, 1868 | Portugal to Italy, Turkey. Introduced to USA | (Old value) | |
| 2021-11-11 | Reference included | | | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Genus synonymy | Leucauge White, 1841 | Opas synonymized with Leucauge | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Genus updated | Opas O. Pickard-Cambridge, 1896 | Status: Synonym (Old value) | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge trilineata (Mello-Leitão, 1940) | Brazil | Species transferred from Opas to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge paranensis (Mello-Leitão, 1937) | Brazil | Species transferred from Opas to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge melanoleuca (Mello-Leitão, 1944) | Brazil | Species transferred from Opas to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge caudata (Mello-Leitão, 1944) | Brazil | Species transferred from Opas to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge caudacuta (Taczanowski, 1873) | Peru, Guyana | Species transferred from Opas to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Species transferred to new genus | Leucauge lugens (O. Pickard-Cambridge, 1896) | Mexico, Panama | Species transferred from Opas to Leucauge | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Genus synonymy | Leucauge White, 1841 | Mecynometa synonymized with Leucauge | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Genus updated | Mecynometa Simon, 1894 | Status: Synonym (Old value) | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge gibbosa (Schmidt & Krause, 1993) | Comoros | Species transferred from Mecynometa to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Transferred to other genus after syn. gen | Leucauge argyrosticta (Simon, 1907) | West Africa, Congo | Species transferred from Mecynometa to Leucauge after genus synonymy | Ballesteros & Hormiga, 2021 |
| 2021-11-11 | Species transferred to new genus | Leucauge globosa (O. Pickard-Cambridge, 1889) | Guatemala to Brazil | Species transferred from Mecynometa to Leucauge | Ballesteros & Hormiga, 2021 |