Acroneuria azunensis, Stark & Sivec, 2008

Stark, Bill P. & Sivec, Ignac, 2008, New Vietnamese Species Of Genus Acroneuria (Plecoptera: Perlidae), Illiesia 4 (16), pp. 154-160 : 156-157

Acroneuria azunensis sp. n.

( Figs. 9‐15 )

Material examined. Holotype ♂, 7 ♂, 6 ♀ paratypes from Vietnam, Gia Lai Province, An Khe District, Tram Lap, Azun River , 2 km northwest on trail from forestry building, 17 June 1996, D. Currie, J. Swann, ROM 961056 ( ROM). Additional Paratypes: Vietnam: Same site as holotype, 23 June 1996, D. Currie, J. Swann, ROM 961084 , 1 ♂, 2 ♀ ( IEBR). Same data but 3 km northeast of forestry building, 21 June 1996, D. Currie, J. Swann, ROM 961076 , 1 ♂, 1 ♀ ( BPS). Same data but 1 km southwest on trail from forestry building, 18 June 1996, B. Hubley, ROM 961057 , 2 ♂ ( ROM). Gia Lai Province, An Khe District, Dacklest River, 5.2 km northeast Tram Lap on forest road, 15 June 1996, D. Currie, J. Swann, ROM 961047 , 3 ♂ ( ROM). Gia Lai Province, Buon Li Mountains, Kon Cha Range , 1000‐1200 m, 14‐20 April 1995, A. Gorohov , 1 ♂, 1 ♀ ( PMSL). Same location, May 1995, A. Gorohov , 1 ♂, 1 ♀ ( PMSL) .

Adult habitus. Triocellate. General color yellow patterned with dark brown. Head yellow with dark ocellar patch ( Fig. 9 ). Pronotum pale brown with scattered brown rugosities; meso and metathorax each with lateral dark spot; mesonotum dark brown between wing bases. Femora banded, pale on proximal 2/3, dark apically ( Fig. 13 ); fore tibiae mostly brown, mid and hind tibiae brown along dorsal margin but paler ventrally. Wings pale yellow brown. Antennal segments 2‐26 brown, but pale beyond; cerci pale.

Male. Forewing length 21‐22 mm. Paraprocts triangular, heavily sclerotized in apical half but with circular membranous area near base ( Fig. 10 ).

Volume 4 – Number 16 – Page 156

Tergum 10 with large mesal sensilla basiconica patch continuous across center of segment ( Fig. 10 ); tergum 9 without sensilla basiconica patch. Aedeagus a relatively cylindrical membranous bag with slender apex, armed with patches of variably sized, small to minute spines ( Fig. 11 ); basal section completely ringed by broad band of densely packed, small, triangular scale setae; mid section armed with scattered fine setal spines; tip not completely everted, but apparently sparsely armed with microtrichia. Dorsal aspect with an uneverted gonopore lobe near midlength.

Female. Forewing length 26‐27 mm. Subgenital plate broadly produced over 2/3 of sternum 9, hind margin emarginate or weakly notched ( Fig. 12 ); plate surface covered with scattered, upright, prominent bristles. Vagina slender, more or less cylindrical, with robust

spermatheca about 2/3 vaginal length; apex of spermatheca hooked ventrad and bearing elongate accessory glands.

Egg. Length ca. 0.32 mm, diameter ca. 0.24 mm. Outline pear shaped, collar button‐ like. Chorion smooth or with very faint follicle cell impressions ( Figs. 14‐15 ). Micropyles located near anterior pole.

Larva. Unknown.

Etymology. The species name is based on the Azun River where most of the type series was collected.

Diagnosis. Although A. azunensis is similar to both A. apicalis and A. bachma in general color pattern, the uniformly yellow wing membrane and longitudinally bicolored mid and hind tibiae are distinctive. The species is more similar to A. apicalis but differs from that species in lacking dark wing tips and black cerci and in the absence of dense patches of setal spines on

Figures

Figs. 9‐13. Acroneuria azunensis. 9. Head and pronotum, 10. Male terminalia, dorsal, 11. Aedeagus, ventral, 12. Female terminalia, ventral, 13. Foreleg.

Figs. 14‐15. Acroneuria azunensis egg micrographs. 14. Entire egg, lateral, 15. Enlargement of anterior pole with micropyles located near apex.