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 Gergithoides Schumacher, 1915 Gergithoides Schumacher, 1915: 126 . Type species: Gergithoides carinatifrons Schumacher, 1915 by monotypy. Daruma Matsumura, 1916: 103 (preoccupied). Type species: Daruma nitobei Matsumura, 1916 , by original designation. Synonymized by Ishihara (1965: 208) under the erroneous spelling “ Darma ”. Darumara Metcalf, 1952: 227 . New name for Daruma Matsumura, 1916 . Synonymized by Gnezdilov (2009: 85) [already synonymized by Ishihara (1965) ]. Darma Ishihara, 1965: 208 . Misspelling of Daruma . Diagnosis The definition of the genus extrapolated from the key to the genera of Hemisphaeriini provided by Sun et al. (2012) features the following distinctive set of characters: (1) the hind wing longer than half length of tegmen; (2) the frons with a complete median carina; (3) the lateral margins of the frons not elevated; (4) a row of tubercles along the lateral margins of the frons. At species level, the shape of the bi- or trispinose lateral process of the periandrium provides very stable and reliable characters. The Vietnamese species of Gergithoides were treated in Constant & Pham (2017) . Species included Gergithoides carinatifrons Schumacher, 1915 Gergithoides caudospinosus Chen, Zhang & Chang, 2014 Gergithoides gibbosus Chou & Wang, 2003 Gergithoides gnezdilovi Constant & Pham, 2017 Gergithoides jejudoensis Rahman, Kwon & Suh, 2012 Gergithoides nui Constant & Pham, 2017 Gergithoides olivaceus sp. nov. Gergithoides rugulosus ( Melichar, 1906 ) Gergithoides undulatus Wang & Che, 2003 Note The species of Gergithoides should be identified based on the comparison of the male terminalia with reliable illustrations. The pending issues in the identity of some species of Gergithoides , especially in the fauna of China , were explained in detail by Constant & Pham (2017) but not addressed in Zhang et al . (2020) .