| Rank | Scientific name | Taxonomic status |
|---|---|---|
| family | Abriolinidae | accepted |
| family | Acanthoessidae | accepted |
| family | Acidaspidae | accepted |
| family | Adercotrynidae | accepted |
| family | Alcelaphidae | accepted |
| family | Anchitheridae | accepted |
| family | Annuloptallinidae | accepted |
| family | Anthinocrinidae | accepted |
| family | Apatorthidae | accepted |
| family | Architemidae | accepted |
| family | Arhouriellidae | accepted |
| family | Aroideae | accepted |
| family | Arsinoeidae | accepted |
| family | Asoellinae | accepted |
| family | Aspidostachyaceae | accepted |
| family | Asteriacitidae | accepted |
| family | Aulostomes | accepted |
| family | Bairdidae | accepted |
| family | Bassariscidae | accepted |
| family | Bathmodontidae | accepted |
| Show more | ||
incertae sedis. GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via biodiversity.aq on 2019-11-13.