Bal, D. 2024. Rediscovery of the Sumatran endemics Onychogomphus rappardi (Odonata: Gomphidae) and Herona sumatrana sumatrana (Lepidoptera: Nymphalidae), with notes on observations of other rare species from the north of Sumatra. BIO PALEMBANICA. 1, 2 (Dec. 2024), 48–58. DOI:https://doi.org/10.36982/bio.v1i2.4921.