Leentvaaria Demoulin, 1966

Salles, Frederico F., Dominguez, Eduardo, Mariano, Rodolfo & Paresque, Roberta, 2016, The imagos of some enigmatic members of the Hermanella complex (Ephemeroptera, Leptophlebiidae), ZooKeys 625, pp. 45-66 : 51-53

Taxon classification Animalia Ephemeroptera Leptophlebiidae

Leentvaaria Demoulin, 1966 Figures 5, 6, 7c, d

Diagnosis.

The male imago of Leentvaaria can be distinguished from other genera of the Hermanella complex by the following combination of characters: 1) Eyes separated on meson of head by a short distance-less than 0.5 times the width of the median ocellus (Fig. 5a); 2) Fork of MA asymmetrical and fork of MP slightly asymmetrical (Fig. 6a); 3) Crossvein above fork of MA not slanted (Fig. 6a); 4) Styliger plate enlarged posteriorly, completely covering penis lobes in ventral view (Fig. 6d); 5) Penis divided, each lobe with a long spine apically curved (Fig. 6e).

Description of male imago

(in alcohol). Head (Fig. 5a, b, c, e): Eyes separated on meson of head by short distance-less than 0.5 times width of median ocellus (Fig. 5a, b, c), lower portion of eyes slightly < ¼ length of upper portion.

Thorax: Prosternum with narrow, straight median carina, similar to Hermanella and Hylister , but with longer anterior arms, as in Fig. 5d.

Wings (Fig. 6a, b, c): Maximum width of fore wings 1/3 their maximum length; maximum width of hind wings about ½ their maximum length; maximum length of hind wings 1/5 maximum length of fore wings. Fore wings: vein Rs forked slightly> 1/6 distance from base of vein to margin, fork of vein MA asymmetrical and forked at ½ distance from base of vein to margin, cross vein above fork of MA not slanted; fork of vein MP slightly asymmetrical and forked 1/3 distance from base of vein to margin; vein ICu1 attached at base to vein CuA by crossvein; vein ICu2 attached at base to vein ICu1 by crossvein. Hind wings: costal projection well-developed, acute; located ½ distance from base to apex; vein MP unforked; apex of wings rounded; vein Sc ½ distance from base to wing margin, ending in crossvein; 4-6 crossveins present.

Legs. Ratio of segments in male forelegs, 0.6:1.0 (1 mm): 0.03:0.35:0.30:0.15:0.06. Claws of each pair dissimilar, one apically hooked and one blunt, pad-like.

Abdomen. Genitalia (Fig. 6d, e): Styliger plate: length of segment II of forceps subequal to length of segment III; segment II of forceps 1/9 length of segment I; styl iger plate enlarged posteriorly, completely covering penis lobes in ventral view. Penis divided, each lobe with long spine apically curved. Caudal filaments: terminal filament longer than cerci.

Description of female imago

(in alcohol). Lengths: body, 4.7-4.9 mm; fore wings, 4.9-5.2 mm; hind wings, 0.8-0.9 mm.

Head: Eyes (Fig. 5e) separated on meson of head by 6 times width of lateral ocellus.

Abdomen: Ninth sternum deeply cleft apically.