Longitarsus marguzoricus Konstantinov

Konstantinov, Alexander S. & Lopatin, Igor K., 2000, Review Of The Longitarsus Asperifoliarum Group Of Species (Coleoptera: Chrysomelidae: Alticinae), The Coleopterists Bulletin 54 (2), pp. 200-220 : 206-213

Longitarsus marguzoricus Konstantinov , new species

Figs. 5, 6 , 9, 12 , 14, 19, 20 , 24, 28, 43­48

Description. Body slightly convex. Length 1.90–2.22 mm, width 0.96–1.10 mm. Color black with dark bronze reflection. Antenna and leg brown­ferrugineous, base of first antennomere and antennomeres 5–11 slightly darker. Metafemur black with bronze reflection. Pro­ and mesofemora dark brown, except apices which are dark yellow. Tibiae dark yellow. Vertex strongly shagreened, with well developed supraorbital puncture above orbital sulcus. Antennal callus poorly developed, as high as vertex, not delineated from vertex by grooves. Surface of antennal callus moderately shiny, lacks any sculpture. Midfrontal and suprafrontal sulci absent. Frontal ridge high and convex in lateral view, moderately narrow, slightly wider posteriorly ( Fig. 5 ), but narrower than in L. violentus . Anterofrontal ridge attached to end of frontal ridge, in middle as high as frontal ridge, slightly thicker than frontal ridge. Second antennomere slightly longer than third, as long as fourth. Pronotum length/ width ratio 1.34 to 1.41, slightly wider basally. Lateral side convex, maximum width in front of middle. Anterolateral callosity well developed, slightly lower anteriorly, forming acute angle ( Fig. 6 ). Lateral margin narrowly explanated, forming oblique angle before middle, explanations wider apically. Posterolateral callosity low, and wide. Punctures, poorly defined, shallow, moderately large, 1.5 to 2 times larger than interspaces. Interspaces strongly shagreened. Scutellum widely rounded on top. Elytron with well developed humeral callus; maximum width behind middle. Apex almost flat with denticle ( Fig. 9 ). Punctures as large or larger than punctures on pronotum, their diameter 1.5–2.0 times greater than distance between them. Interspaces minutely shagreened. Male metatibia slightly concave in dorsal view. First metatarsomere of male 1.04 times longer than rest of segments together. Second metatarsomere of male nearly as long as fourth and 2 times longer third. Metatibial spur as long as third metatarsomere. Tarsal claw thin, lacking denticle. Median lobe of aedeagus widening anteriorly with deep, wide ventral groove. Bottom of groove membranous, with several well developed longitudinal wrinkles. Apex widely rounded with moderately wide denticle ( Fig. 43, 45 ). Preapical abdominal tergite of female without long setae. Distal half of preapical abdominal tergite densely covered with short setae, basal half with few large pores ( Fig. 14 ). Apical abdominal tergite covered with long setae. Several microtrichia situated in middle of this tergite. Lateral corners of this tergite lack microtrichia ( Fig. 14 ). Receptacle of spermatheca ( Figs. 19–20 ) longer than pump. Inner side of receptacle convex, outer side nearly straight. Vertical part of pump short, well delineated from receptacle and from horizontal part of pump. Spermathecal duct basally pointed in direction opposite to receptacle, forming almost no loop away from receptacle; apically making a few coils. Tignum slender, slightly curved, slightly acute posteriorly ( Fig. 24 ). Vaginal palpus slender, posteriorly straight, broadly rounded at apex ( Fig. 28 ). Apical sclerotization short, obtuse.

Variability. The median lobe of the aedeagus is a main source of species level characters in Longitarsus . It is considered to be a conservative structure with faint variability. However in L. marguzoricus it varies in the shape of the apex which sometimes is more narrow and has narrower denticle ( Figs. 43– 48 ).

Comments. It is possible that this species represents L. asperifoliarum var. defectus Jacobson (1893) however we were unable to find any specimens previously identified as this taxon. Jacobson described this variety as being small and without humeral calli. Longitarsus marguzoricus is larger than L. asperifoliarum and has well developed humeral calli. Longitarsus marguzoricus is similar to L. violentus Weise and L. violentoides sp. nov. It can be separated from L. violentoides by the few deep setiferous pores basally on the last abdominal tergite of female ( Figs. 14 ); spermathecal duct making almost no loop away from receptacle, apically forming 2 extremely similar coils ( Figs. 19– 20 ); the apex of the median lobe of the aedeagus with wide but well developed denticle ( Figs. 43–48 ); and median lobe of the aedeagus longer, widening anteriorly. From L. violentus it can be separated by the larger median lobe, anteriorly widening and the absence of microtrichia on the lateral part of the apical abdominal tergite of female.

Type material. Holotype?: Tadzhikistan, Zeravshanskii mountain ridge, s. Padrut, Marguzorskie Lakes , 18.V.1991, leg. A. Konstantinov ( USNM) . Paratypes: the same labels as holotype (6?, 2 / AKPC), (6?, 2 / USNM), (1? ZMBU) , (2?, 5 / ZMAS) . Paratypes: the same labels as holotype except for the date (23.V.1991) (3?, 6 / AKPC), (4?, / USNM). Tadzhikistan, Zeravshanskii mountain ridge, Marguzorskie Lakes , Khurdak, 18–19.V. 1967, leg. I. Lopatin, (2?, 2 / USNM) .

Figures

Figs. 5, 6. Longitarsus marguzoricus Konstantinov. 5) head, frontal view; 6) pronotum.

Figs. 7–9. Elytral apex. 7) Longitarsus asperifoliarum; 8) Longitarsus hissaricus Lopatin; 9) Longitarsus marguzoricus Konstantinov. Figs. 10–12. Metatarsus of male. 10) Longitarsus asperifoliarum; 11) Longitarsus hissaricus Lopatin; 12) Longitarsus marguzoricus Konstantinov.

Figs. 17–22. Spermathecae. 17, 18) Longitarsus asperifoliarum Weise; 19, 20) L. marguzoricus Konstantinov; 21) L. violentoides Konstantinov; 22) L. violentus Weise.

Figs. 43–52. Median lobe of aedeagus. 43–48) Longitarsus marguzoricus Konstantinov; 49, 50) L. tishechkini Konstantinov; 51, 52) L. violentoides Konstantinov.

Figs. 13–16. Last abdominal tergites of female. 13) Longitarsus asperifoliarum Weise; 14) L. marguzoricus Konstantinov; 15) L. violentoides Konstantinov; 16) L. violentus Weise.

Figs. 23–26. Tignum (8th abdominal sternite of female). 23) Longitarsus asperifoliarum Weise; 24) L. marguzoricus Konstantinov; 25) L. violentoides Konstantinov; 26) L. violentus Weise.

Figs. 27–30. Vaginal palpi. 27) Longitarsus asperifoliarum Weise; 28) L. marguzoricus Konstantinov; 29) L. violentoides Konstantinov; 30) L. violentus Weise.