Acroneuria apicalis, Stark & Sivec, 2008

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

Acroneuria apicalis sp.n.

( Figs. 1‐8 )

Material studied. Holotype ♂ from Vietnam, Vinh Phu Province , Tam Dao Hill Station, forest edge near town, 5‐31 May 1996, B. Hubley, ROM 961006 ( ROM) . Paratypes: Vietnam: Vinh Phu Province , Tam Dao Hill Station, lower waterfall of stream flowing through town, 11 May 1996, B. Hubley, D.C. Darling, ROM 961030 , 1 ♀ ( ROM). Vinh Phu Province, Tam

Dao Hill Station , 3‐31 May 1996, B. Hubley, D.C. Darling, M. Hanson, 1 ♂ (pinned, IEBR) . Vinh Phu Province , Tam Dao Hill Station, 930 m, 15 May 1996, B. Hubley, D.C. Darling, M. Hanson, 1 ♂ (pinned, ROM) . Vinh Phu Province , Tam Dao Hill Station, 2 km along forest trail at west end of town, 4‐31 May 1996, B. Hubley, 1 ♀ (pinned, ROM) . Vinh Phu Province, Tam Dao, 600‐900 m, 17‐31 May 1995, A.V. Gorohov, 1 ♂, 2 ♀ (PMSL). Vinh Phu Province, Tam Dao, 7 April 1994, S. Nirasawa, 1 ♀ ( PMSL) . Same location, 2 May 1994, S. Nirasawa, 2 ♀ ( PMSL) . Same location, 29 April‐3 May 1989, Z. Hubonov, 3 ♀ ( PMSL) .

Adult habitus. Triocellate. General color yellow patterned with dark brown to black pigment. Head yellow with dark ocellar patch ( Fig. 1 ). Pronotum yellow with mesal area of pale brown; meso and metathorax each with lateral dark spot; mesonotum dark brown between wing bases. Femora banded, pale basally and dark brown to black in apical half ( Fig. 6 ); tibiae and tarsi dark. Wings pale yellow brown except for dark brown tips ( Fig. 7 ). Antennal bases pale but flagellum dark brown; cerci entirely dark brown to black.

Male. Forewing length 27 mm. Paraprocts heavily sclerotized, slender, dark and hooked at the tips ( Fig. 2 ). Tergum 10 with large mesal sensilla basiconica patch, tergum 9 without sensilla basiconica. Aedeagus membranous, but armed with variably sized setal spines; apical section bearing ventrolateral bands of thin, brown setal spines in two dense patches ( Fig. 3 ); ventral surface of apical section rather uniformly covered with thin brown setal spines. Basal half of aedeagus bearing a basal, complete band of pale, triangular scale‐ like spines; mesal area with scattered slender setal spines and microtrichia; apex of mesal area bare.

Female. Forewing length 30 mm. Subgenital plate broadly produced over half of sternum 9, hind margin emarginate or weakly notched ( Fig. 4 ); subgenital plate covered with fine, upright bristles. Vagina membranous, more or less cylindrical, without obvious internal armature, and bearing a pair of slender, elongate accessory glands on anterior angles ( Fig. 5 ); spermatheca lost during dissection.

Egg. Outline pear shaped. Collar button‐ like ( Fig. 8 ). Chorion smooth, micropyles located near anterior pole.

Larva. Unknown.

Etymology. The species name refers to the darkened wing tips of this species.

Diagnosis. This species is closely related to A. azunensis (described below) and A. bachma ( Cao & Bae 2007) ; males of both new species are identified as A. bachma in the key presented by Cao & Bae (2007). The three species share a similar color pattern

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including a pale yellow to pale brown general habitus, dark brown to black quadrangular ocellar spot, dorsomesal dark area on mesonotum between wing bases, lateral dark spots on meso and metathorax, and banded femora. In addition, these species are very similar in the shape of male paraprocts, pattern of sensilla basiconica on male tergum 10, female subgenital plate structure and egg shape. This species is distinguished from these similar species on the basis of dark wing tips, dark cerci, and differences in aedeagal armature ( Figs. 3, 7 ).

Figures

Figs. 1‐8. Acroneuria apicalis. 1. Head and pronotum, 2. Male terminalia, dorsal, 3. Aedeagus, ventral, 4. Female terminalia, ventral, 5. Vagina, dorsal, 6. Foreleg, 7. Wing tip, 8. Egg, lateral aspect.