Sixteen issid planthopper species in one day in Dong Son-Ky Thuong Nature Reserve in North Vietnam: Eight new species, one new genus and additional new records (Hemiptera: Fulgoromorpha: Issidae) Author Constant, Jérôme 6E6072A1-9415-4C8D-8E60-2504444DB290 Royal Belgian Institute of Natural Sciences, O. D. Phylogeny and Taxonomy, Entomology, Vautier street 29, B- 1000 Brussels, Belgium. jerome.constant@naturalsciences.be Author Pham, Hong Thai E34CB863-7E3B-4E8F-8738-B41C07D9F5F9 Mientrung Institute for Scientific Research, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Hanoi, Vietnam. & Graduate School of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam. jerome.constant@naturalsciences.be text European Journal of Taxonomy 2024 2024-01-24 919 1 1 87 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2407/10617 journal article 10.5852/ejt.2024.919.2407 2118-9773 10559520 72B7907F-F901-4DDD-B2DD-63D03253837E Genus Mongoliana Distant, 1909 Mongoliana Distant, 1909: 87 . Type species. Hemisphaerius chilocorides Walker, 1851 , by original designation. Diagnosis The genus Mongoliana Distant, 1909 can be separated from the other genera of Mongolianina by the following combination of characters: (1) the tegmina with venation indistinct and with their basal angle projecting anteriorly and forming a rounded lobe beside the head; (2) the vertex wider than long; (3) the frons rugulose, weakly convex and often with a row of tubercles along lateral and upper margins; (4) the clypeus slightly elevated in midline but not sharply carinate and not produced anteriorly; (5) the hind wings only slightly shorter than the tegmina. Note The genus was reviewed and redescribed by Meng et al . (2016) . More recently, Zhang et al . (2020) transferred Hemisphaerius signifier Walker, 1851 to the genus Mongoliana , hence indirectly providing the first record of the genus in Vietnam as H. signifer was recorded from Thanh-Ha, Hoa Binh Province , by Fennah (1978) . However, Fennah’s record is based on a female specimen, so a record of M. signifer in Vietnam still needs to be confirmed by a reliable identification based on male terminalia characters. Species included (16) Mongoliana albimaculata Meng, Wang & Qin, 2016 Mongoliana arcuata Meng, Wang & Qin, 2016 Mongoliana bistriata Meng, Wang & Qin, 2016 Mongoliana chilocorides ( Walker, 1851 ) Mongoliana contusa ( Walker, 1851 ) Mongoliana lanceolata Che, Wang & Chou, 2003 Mongoliana latistriata Meng, Wang & Qin, 2016 Mongoliana naevia Che, Wang & Chou, 2003 Mongoliana pianmaensis Chen, Zhang & Chang, 2014 Mongoliana qiana Chen, Zhang & Chang, 2014 Mongoliana recurrens ( Butler, 1875 ) Mongoliana serrata Che, Wang & Chou, 2003 Mongoliana signifer ( Walker, 1851 ) Mongoliana sinuata Che, Wang & Chou, 2003 Mongoliana triangularis Che, Wang & Chou, 2003 Mongoliana vietnamica sp. nov.