Tretogonia Melichar, 1926

Mejdalani, Gabriel, Domahovski, Alexandre C., Rendón-Mera, Diana I. & Cavichioli, Rodney R., 2019, Tretogonia Melichar (Hemiptera: Cicadellidae: Proconiini): two new species from South Brazil and a redescription of T. dentalis Emmrich, 1988, European Journal of Taxonomy 513, pp. 1-14 : 3

Genus Tretogonia Melichar, 1926

Tretogonia Melichar, 1926: 273 (type species: Tettigonia pruinosa Walker, 1851 , preoccupied (= Tretogonia notatifrons Melichar, 1926 ), by original designation).

Remarks

According to Young (1968), Tretogonia belongs to the group of genera in which the hind leg meron is exposed when the forewings are at rest position. It can be recognized by the following combination of characters (characters (1) and (4) are proposed here for the first time as taxonomically useful): (1) antennal ledge with distinct dorsal and ventral carinae, in frontal and lateral views, (2) pronotum and forewings conspicuously pitted, each pit with small seta, (3) posterior margin of pronotum rounded and extending to scutoscutellar suture, (4) forewing brachial cell distinctly narrowed basally and (5) general coloration brown. In species of Tretogonia , the body is usually densely covered by brochosomes. The two new Brazilian species described here show the above-mentioned diagnostic features of Tretogonia . This genus is apparently monophyletic, as indicated by the morphological phylogenetic analysis of the Proconiini conducted by Mejdalani (2000). Synapomorphies of Tretogonia include the pronotum strongly produced posteriorly, the conspicuous pronotal and forewing pits, and the narrowed forewing brachial cell ( Mejdalani 2000).

The following species are currently recognized in this genus (distribution based on Young 1968, Cavichioli & Zanol 1991, Freytag & Sharkey 2002, McKamey 2007, Wilson et al. 2009, Dellapé 2016 and Takiya et al. 2018; an asterisk indicates species known only from females):

T. albicans (Walker, 1858) *. Brazil.

T. bergi Young, 1968 . Argentina, Brazil, Paraguay, Uruguay.

T. callifera Melichar, 1926 . Bolivia, Brazil, French Guiana, Peru, Suriname.

T. cinerea (Osborn, 1926) . Bolivia, Brazil.

T. conspersa Schmidt, 1928 . Colombia, Guyana, Panama, Venezuela.

T. conspicua Melichar, 1926 *. Ecuador.

T. costalimai Young, 1968 . Brazil, Guyana, Venezuela.

T. cribrata Melichar, 1926 . Argentina, Bolivia, Brazil, French Guiana, Peru.

T. dentalis Emmrich, 1988 . Argentina, Brazil (new record), Paraguay.

T. diminuta sp. nov. Brazil.

T. elegantula sp. nov. Brazil.

T. lateritia (Taschenberg, 1884) *. Brazil.

T. notatifrons Melichar, 1926 . Argentina, Bolivia, Brazil, Ecuador, French Guiana, Paraguay, Suriname. T. punctatissima Melichar, 1926 . Colombia, Ecuador, Peru, Venezuela.

T. tomentosa (Distant, 1908) . Ecuador.