Phyllotreta sholaksori Konstantinov and Moseyko, 2019

Konstantinov, A. S. & Moseyko, A. G., 2019, A new species of Phyllotreta Chevrolat, 1836 (Coleoptera: Chrysomelidae: Galerucinae: Alticini) from Omsk Province of Russia with comments on Phyllotreta species diversity in Northeastern Palearctic, Zootaxa 4679 (3), pp. 499-510 : 500

Phyllotreta sholaksori Konstantinov and Moseyko new species

( Figs 1 , 2 )

Description. Body length 1.7–1.9 mm, width 0.8–0.9 mm.

Dorsum black, without metallic lustre. Femur black. Tibia dark brown or black in middle, slightly lighter apically and basally. Antennomere one mostly light, darker at base, antennomeres two and three light, antennomere four dark brown, rest of body black.

Vertex shiny, central portion evenly covered with punctures about as large as those on pronotum. Frontal ridge narrow, straight in frontal view, lateral sides nearly parallel. Antennal calli nearly triangular in frontal view, surface without punctures, widely connected along narrow, long midfrontal sulcus. Supracallical and suprafrontal sulci absent. Supraantennal, orbital and supraorbital sulci deep. Deep and short impression perpendicular to orbital sulcus in front of supraorbital pore. Anterofrontal ridge slightly concave, as tall and as narrow as frontal. Second antennomere slightly longer than third and slightly shorter than fourth. Fifth antennomere longer than fourth and sixth separately.

Pronotum flat in lateral view. Base wider than apex. Lateral margin more or less narrowly explanate. Sides evenly convex with maximum width near middle. Anterolateral callosity moderately long, with dull denticle, straight. Posterolateral callosity short, does not extend beyond lateral margin. Punctures coarse, about as large and slightly denser than those on elytra. Surface between punctures slightly shagreened. Basal part of pronotum with the same density of punctures as apical.

Scutellum nearly twice as wide as long, broadly rounded on top. Elytron with humeral callus. Lateral side of elytron slightly convex at basal 2/3. Maximum width at about middle. Punctures confused, coarse, about as large as those on pronotum. Surface between punctures even, not shagreened.

Metatibia moderately long and narrow, straight in lateral view, slightly convex on lateral side before flattening apically, gradually widening apically. Dorsally convex, flat at apical 1/4. In male first protarsomere 1.44 times as long as wide; 1.6 times as long as second and 1.4 times as wide as second. First and second metatarsomeres narrow and long, straight. First metatarsomere 4.5 times as long as wide and 1.5 times as long as second.

Median lobe of aedeagus with distal part lanceolate in ventral view, without well differentiated denticle. Sides of distal narrowing part relatively long and straight. Median lobe very slightly curved in middle in lateral view. In lateral view, distal part generally straight, very slightly S-shaped. Ventral side widely and shallowly canaliculate. Dorsal side without transverse wrinkles, sclerotized part narrowly triangular.

Etymology: This species is named after Lake Sholaksor near which the holotype was collected.

Habitat: meadows near salt lakes.

Remarks: Phyllotreta sholaksori may be differentiated from species with which it shares the following characters: full length elytra, black color, lacking yellow pattern and metallic tint, yellowish or otherwise lightly colored first, second, third and often fourth antennomeres and male antennomeres similar to that of females, without modifications and straight metatibiae, by the following key.

Types: Holotype. Russia, West Siberia, Omsk Province. Lake Sholaksor and field near it, 54º15΄N, 75º13΄E, 10.VI.2018 (A.G. Moseyko), 1 ♂ ( ZMAS) . Paratype ♂, the same labels as Holotype ( USNM) . Paratypes: Omsk Province. Moskalenskii Distr.: Amrinskaya ravine SE of Lake Ebeity, 17.VI.2018 (A.G. Moseyko), 1 ♂ ( ZMAS) . Okoneshnikovskii Distr.: Lake Chebakly S of Chistovo Vill., 21.VI.2018 (A.G. Moseyko), 3 ♂ ( ZMAS) . Cherlak- skii Distr.: Lake Ulzhai , 10.VI.2018 (A.G. Moseyko), 1 ♂ ( ZIN) ;

Figures

FIGURE 1. Phyllotreta sholaksori new species. A—habitus, dorsal view; B—habitus, lateral view; C—head, frontal view; D—meadian lobe of aedeagus, ventral, lateral and dorsal views.

FIGURE 2. Phyllotreta sholaksori new species, habitat.