Duraznoscytinum aristovi Lara, Cariglino & Zavattieri, 2023

LARA, MARÍA B., CARIGLINO, BÁRBARA & ZAVATTIERI, ANA M., 2023, Duraznoscytinum aristovi gen. et sp. nov., a new scytinopterid (Hemiptera: Cicadomorpha) from the Upper Triassic of Argentina, Palaeoentomology 6 (2), pp. 146-154 : 150-151

Duraznoscytinum aristovi Lara, Cariglino & Zavattieri sp. nov.

( Fig. 2 )

Type material. Holotype IANIGLA-PI 1063, a complete compression forewing (tegmen).

Etymology. In memory of the late Dr Daniil Aristov for his contributions to the knowledge of Triassic insects from Argentina.

Diagnosis. As for genus because of monotypy.

Type locality and horizon. Quebrada del Durazno locality, Potrerillos Formation (upper section), lower Upper Triassic (Carnian), southern flank of Cerro Cacheuta , southern end of the Precordillera , Potrerillos-Cacheuta depocenter of the Cuyana Basin, Mendoza Province, Argentina .

Description. Sclerotized forewing, rounded apically, with clavus attached, nearly complete. Costal margin convex and thickened basally. Costal area wide. R+M (2.31 mm) arched and forked in R and M. Stem R long (3.22 mm) early branched in RA (4.99 mm preserved, 7.76 mm total estimated) and RP (9.49 mm), before middle length of forewing. Stem RP concave basally, origin at basal 1/3 of wing length, following in parallel to RA, linked with M 1 by straight crossvein r-m (0.79 mm). Stem M long (8.89 mm) and mostly straight, running parallel to CuA and forked in M 1+2 (1.55 mm) and M 3+4 (1.36 mm): M 1 (2.51 mm), M 2 (2 mm), M 3 (2.08 mm) and M 4 (2.04 mm). Stem CuA long (8.42 mm), distally forked in CuA 1 (3 mm, curved, deflecting toward the apical margin), and CuA 2 (2.07 mm, deflecting toward the posterior margin). CuA 1 linked with M by straight and slightly oblique crossvein m-cua (1.02 mm). CuP simple, straight and extended to claval apex. Distance between M fork and m-cua 0.37 mm. Crossvein cua-cup (2.07 mm) visible. Claval area with veins Pcu and A. Pcu (8.22 mm) S-shaped, reaching postclaval margin. Vein A 1 (6.4 mm) connected to A 2 (2.06 mm) forming a “Y” fork. Vein A 2 very close to postclaval margin. Anal angle about 133°. Tegmen with granular ornamentation and dark-brown color pattern, darker in the vein’s courses and some areas (e. g., costal margin, clava).

Dimensions (mm). IANIGLA-PI 1063, Holotype: length = 15.81 mm, width (at level CuA origin) = 5.62 mm, length/width ratio 2.81.

Figures

FIGURE 2. Duraznoscytinum aristovi gen. et sp. nov. Holotype IANIGLA-PI 1063. A, Photograph of the forewing (mirrored). B, Line drawing. Scale bar = 4 mm.