Hydraena Hydraenopsis formula, Taxa Only, Exact Match: 2 Treatments

Hydraena (Hydraenopsis) formula			Jäch, Manfred A., Díaz, Juan A. & Skale, Andre, 2013, The Hydraenidae (Coleoptera) Of The Republic Of Singapore, Raffles Bulletin of Zoology 61 (1), pp. 53-71 : 54-55	54-55
Hydraena (Hydraenopsis) formula			Ghosh, Joyjit, Saini, Jagdish, Gupta, Devanshu, Ghosh, Sujit Kumar & Chandra, Kailash, 2022, A Catalogue of Indian Hydraenidae (Insecta: Coleoptera), Zootaxa 5087 (4), pp. 558-570 : 562	562