- BHL bibliography
- Catalogue of Life: 2020 Annual Checklist
- Synapsis (Scarabaeidae) – Taxon details on Encyclopedia of Life (EOL).
- Global Biodiversity Information Facility. 2019. GBIF Backbone Taxonomy. Checklist dataset. Taxon: Synapsis (Scarabaeidae).
- Nomenclator Zoologicus
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