Gelastyrella Yang, 1994

Constant, Jérôme, Pham, Thai-Hong & Nguyen, Hoai Thu Thi, 2025, Two new Parahiraciini planthoppers from Central Vietnam in the genera Gelastyrella and Pseudochoutagus (Hemiptera, Fulgoromorpha, Issidae), ZooKeys 1257, pp. 1-24 : 1-24

Genus Gelastyrella Yang, 1994

Gelastyrella Yang, 1994 in Chan & Yang, 1994: 90. Type species: Gelastyrella litaoensis Yang, 1994, by original designation.

Diagnosis.

The genus Gelastyrella can be differentiated from the other genera of Parahiraciina by the following combination of characters (based on Zhang et al. 2020):

the frons about as long a wide, with median carina and a transverse carina under the dorsal margin;

the tegmina tapering towards apex, with vein ScP + R forked near base, MP 3 - branched with first fork around midlength and CuA unforked;

the tri-lobed hind wings (with A 2 lobe reduced);

the first metatarsomere with a dense pad of spines ventrally, in addition to spines of the apical margin;

the ventral lobe of the periandrium strongly expanded basiventrad in rounded lobes;

the aedeagus with one pair of lateroventral processes and well developed suspensorium.

Note.

According to Zhang et al. (2020), the genus Gelastyrella differs from the genus Thabena Stål, 1866 by the male genitalia with a well-developed suspensorium (suspensorium small in Thabena ), and the ventral lobe of the periandrium strongly convex in lateral view (straight in Thabena ). The two genera had been previously synonymized by Gnezdilov (2009, 2015), but we follow here the most recent classification. Several undescribed species from South-East Asia are present in the collections (Constant and Pham unpublished), which, together with additional molecular data, could help to refine the status of these genera in the future.

Species included (distribution).

Gelastyrella litaoensis Yang, 1994 ( China: Hainan, Fujian, Guangxi; Taiwan; Vietnam: Hoa Binh, Ninh Binh, Quang Tri, Thanh Hoa and Th ừa Thiên-Hu ế provinces – Chan and Yang 1994; Gnezdilov et al. 2014 a; Gnezdilov 2015; Constant and Pham 2024 b).

Gelastyrella vuquangensis sp. nov. ( Vietnam: Ha Tinh Province).