Tretogonia dentalis Emmrich, 1988

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 : 9-10

Tretogonia dentalis Emmrich, 1988

Figs 26–34

Tretogonia dentalis Emmrich, 1988: 189 .

Diagnosis

Forewing with longitudinal broad beige band extending along costal margin from base to level of claval apex ( Fig. 27 ); pygofer process with distal half directed dorsally ( Fig. 29 ), serrated apically ( Fig. 30 ); style with apophysis moderately expanded apically ( Fig. 32 ); aedeagus with dorsal lobe followed by pair of dentiform processes directed anteriorad ( Fig. 33 ).

Material examined

BRAZIL • 1 ♂; “BRASIL, MS [State of Mato Grosso do Sul], Porto Murtinho, / Faz. Progresso 21º35′57″S / 57º45′26″W / 23. II. 2009 A. / Paladini, D.R. Parizotto, P.C. / Grossi leg. Luz ”; DZUP .

Type locality

San Bernardino, Paraguay ( Emmrich 1988).

Measurement

Body length: ♂ 10.2 mm.

Description

Male

COLORATION. General coloration ( Figs 26−28 ) brown. In dorsal view, head with small darker spots near posterior margin. Face light brown. Pronotum with dark brown, irregular Y-shaped marking on anterior half, its arms reaching humeri. Forewing with longitudinal broad beige band extending along costal margin from base to level of claval apex; inner border of this band with dark brown line; area between dark brown line and brachial cell reddish-brown; area of apical cells and distal part of anteapical cells light brown. Legs mostly brown to reddish-brown.

STRUCTURE. Head in dorsal view ( Figs 26−28 ): moderately produced anteriorly, anterior margin rounded, median length of crown slightly more than 4/10 of interocular width and almost 3/10 of transocular width. Other features of head and thorax much as in T. diminuta sp. nov. and in the description of the genus by Young (1968: 166).

TERMINALIA. Pygofer ( Fig. 29 ) moderately produced posteriorly, broadly rounded distally, angulate at apex; with dispersed microsetae and ventroapically with macrosetae; ventral margin with elongate process originated from basal third, its distal half directed dorsally, serrated apically ( Fig. 30 ). Subgenital plate ( Fig. 31 ) not fused to its counterpart; triangular, with small lobe on basal half of outer margin; with numerous dispersed microsetae and few macrosetae near apex; dorsal surface with small tooth at median third; plate ( Fig. 29 ) not extending as far posteriorly as pygofer apex. Style ( Fig. 32 ) elongate, attaining tooth of plate; apophysis moderately expanded and obtuse apically. Connective ( Fig. 32 ) Y-shaped; very short; stalk without median dorsal keel. Aedeagus symmetrical; shaft ( Fig. 33 ) short, straight, without lateral expansions; with dorsal lobe followed by pair of dentiform processes; in ventral view ( Fig. 34 ), shaft somewhat anchor-shaped apically, with afore-mentioned pair of preapical dentiform processes directed anteriorad.

Remarks

Our identification of T. dentalis is based on a comparison of our male specimen from the State of Mato Grosso do Sul with the original description and illustrations by Emmrich (1988). This is the first record of T. dentalis from Brazil. This species, described based on a single male from Paraguay and also recorded from Argentina ( Dellapé 2016), can be recognized by the combination of features provided in the diagnosis. Our comparative studies on species of Tretogonia suggest that T. dentalis could be a junior synonym of T. lateritia (Taschenberg, 1884) . The color pattern of the female holotype of the latter species, described from “Paraná” and deposited at the Martin-Luther-Universität (Halle-Wittenberg, Germany), is quite similar to that of our male specimen (see digital image of the holotype in Wilson et al. 2009). However, we refrain from proposing a new synonym at this time because the taxonomy of Tretogonia is currently based mainly on features of the male terminalia (see Young 1968). Also, we do not have at hand a female specimen for comparison with the holotype of T. lateritia .

Figures

Figs 26–34. Tretogonia dentalis Emmrich, 1988, ♂ (DZUP 215388). 26. Body, dorsal view. 27. Body, lateral view. 28. Face, frontal view. 29. Valve, pygofer and subgenital plate, lateral view. 30. Pygofer, dorsal view. 31. Valve and subgenital plate, ventral view. 32. Connective and style, dorsal view. 33. Aedeagus and basal segment of anal tube, lateral view. 34. Aedeagus, ventral view. Scales in mm.