Reference
Hans Fery, Ladan Sadeghi, Shidokht Hosseinie (2005): Hygrotus curvilobus sp.n. and H. stefanschoedli sp.n. from Iran, and re-instatement of H. orthogrammus (SHARP, 1882) as valid species (Coleoptera: Dytiscidae). – Koleopterologische Rundschau – 75_2005: 29 - 44.