Ceratogergithus Gnezdilov, 2018

Constant, Jérôme & Pham, Hong Thai, 2025, Issid planthoppers from Bach Ma and Phong Dien in Central Vietnam: (II) Tribe Hemisphaeriini (Hemiptera: Fulgoromorpha: Issidae), European Journal of Taxonomy 994 (1), pp. 1-76 : 9-10

Ceratogergithus Gnezdilov, 2018

Ceratogergithus Gnezdilov, 2018: 1347 .

Type species: Gergithus spinosus Che, Zhang & Wang, 2007 by original designation.

Diagnosis

The distinctive characters of the genus were given by Gnezdilov (2018): (1) the hind wings well developed (longer than half length of tegmen);

(2) the frons wide (wider than long in midline), without median carina;

(3) the clypeus without carina;

(4) the vertex wider than long in midline;

(5) the tegmina without “shoulder-like” projection or anterocostal lobe projecting under the eye;

(6) the posterior margin of the pygofer of males with a strong spine in upper portion on each side;

(7) the aedeagus symmetrical, with median long, narrow dorsal spinose process on base of periandrium; (8) the anal tube of male wide, more or less round.

Note: Gnezdilov (2018) also gave a distinct neck of the capitulum of the male gonostylus as a diagnostic character of the genus. However, this character is not clear in Ceratogergithus pseudotessellatus ( Che, Zhang & Wang, 2007) or in C. pictus sp. nov.; hence, it was removed from the diagnosis.

Species included

Ceratogergithus brachyspinus Yang & Chen, 2019

C. chelatus ( Che, Zhang & Wang, 2007)

C. pictus sp. nov.

C. pseudotessellatus ( Che, Zhang & Wang, 2007)

C. spinosus ( Che, Zhang & Wang, 2007)

Remarks

The species of Ceratogergithus should be identified based on the comparison of male terminalia with reliable illustrations.

The placement of Ceratogergithus brachyspinus Yang & Chen, 2019 in this genus by Yang et al. (2019) is erroneous: despite the presence of a strong spine on the posterior margin of the pygofer, the species shows a narrower vertex, a distinctly narrower and not strongly convex frons, a bulged clypeus and a distinct claval suture on the tegmina. The generic placement of this species needs to be re-assessed and it might represent an undescribed genus.