Inacayalestes aikunhuapi, Petrulevičius, 2015

Petrulevičius, Julián F., 2015, A new Synlestidae damselfly (Insecta: Odonata: Zygoptera) from the early Eocene of Nahuel Huapi Este, Patagonia, Argentina., Arquivos Entomolóxicos 14, pp. 287-294 : 289-290

Inacayalestes aikunhuapi sp. nov. ( Figs. 1-4 )

Diagnosis. As for the genus (see above).

Description. Basal half of a hindwing (?); no color preserved, wing was probably hyaline in the preserved part; length of preserved part, 17 mm; wing 5.4 mm wide three cells distal to RP2 base; wing with long petiole, 4.1 mm preserved part; distance between base and arculus, 4.3 mm, between arculus and nodus, 3.9 mm; between nodus and RP2, 4.7 mm; two primary antenodals aligned with antesubnodals; supplementary antenodal crossveins absent; first primary antenodal brace Ax1 2.5 mm from the (preserved and suspected original) base of the petiole, and 1.7 mm from the second primary antenodal brace Ax2; second primary antenodal brace Ax2 just distal the arculus; RP originates at midpoint of the arculus and basal to arcular brakcet; distance between fork of MA and base of subnodus, 1 mm; vein MAb oblique and long, distal angle of discoidal cell acute; discoidal cell elongate, narrow, 1.6 mm long, 0.3 mm wide, anterior side 0.6 mm, posterior side sigmoidal 1.5 mm, basal side 0.3 mm, distal side 0.7 mm; CuP short and straight, ending at the wing margin, nearer to Ax1 than to Ax2, 0.4 mm distal to Ax1; sdv (part of CuA inmediate to discoidal cell) 0.25 mm long; 1/3 of the posterior margin of the subdiscoidal cell fused to the hind margin; CuP+AA+AP (0.7 mm long) separates from wing margin (AA"+AP), 0.4 mm basal to arcular bracket; MP distally straight; MP distinctly curved after its origin at the distal angle of the discoidal cell; CuA zigzagged in its distal part, reaching posterior wing margin distal (four cells) of the level of base of RP2; one row of cells in cubito-anal area; one row of cells in area between MP and CuA, MA and MP, RP3/4 and MA, IR2 and RP; MA very straight, not zigzagged from the base to three cells distal RP2 base; anterior wing margin depressed at nodus; base of RP3/4 two cells basal to subnodus; base of IR2 opposite to subnodus; subnodus well oblique; base of RP2 6 cells distal of subnodus (4.4 mm); a slightly oblique vein ‘O’ 3 cells distAl bAse of RP2; postnodAl And postsubnodAl crossveins aligned (only two preserved).

Etymology. After "áikün", meaning lake in günün a yajütshü language spoken by the günün a küne (Puelche) people; and "huapi" from the Nahuel Huapi lake, aside the locality, and meaning island in Mapudungum language.

Figures

Fig. 1.- Inacayalestes aikunhuapi gen. nov. et sp. nov. from the Nahuel Huapi Este locality (early Eocene; 54 Ma); Neuquén Province, Patagonia, Argentina. MAPBAR 4138, holotype. Scale bar = 2 mm.

Fig. 2.- Detail of the wing base of Inacayalestes aikunhuapi gen. nov. et sp. nov. Holotype. Scale bar = 1 mm.

Fig. 3.- Detail of the oblique vein "O" of Inacayalestes aikunhuapi gen. nov. et sp. nov. Holotype. Scale bar = 0.5 mm.

Fig. 4.- Camera lucida drawing of holotype (MAPBAR 4138) of Inacayalestes aikunhuapi gen. nov. et sp. nov. Scale bar = 2 mm.