Description. Specimen NIGP159604 (Fig. 3A). Forewing. Length,
41.4 mm; width at the level of nodus, 10.8 mm; distance from base
to nodus, 20.6 mm, and from nodus to pterostigma, 11.9 mm;
pterostigmal length 5.5 mm and maximum width 0.9 mm. Pterostigma
not parallel sided, with basal side somewhat less oblique
than its distal side, and covering 3 cells. IR1 short, originating on
RP1 just below pterostigmal apex. Area between IR1 and RP1 with 2
rows of cells basally and 3 distally, and between IR1 and RP2 with 4
rows. RP1 and RP2 with 1 row of cells between them only basally