Longitarsus igori, Konstantinov, Alexander S., 2005

Konstantinov, Alexander S., 2005, New species of Middle Asian Longitarsus Latreille with discussion of their subgeneric placement (Coleoptera: Chrysomelidae), Zootaxa 1056, pp. 19-42 : 27-28

Longitarsus igori sp. nov.

( Figs. 7 , 31–34 )

Description. Length 1.26–3.04 mm, width 0.65–1.15 mm. Dorsum black with light bronze reflection, pronotum concolorous with elytra. Legs brown, pro­ and mesotibia lighter than pro­ and mesofemora, metafemur as dark as pro­ and mesofemora. Antennae brown, with 3 to 5 basal antennomeres lighter.

Vertex strongly shagreened. Antennal callus as dark, but higher than vertex, not delineated from vertex by supracallinal sulcus. Surface of antennal calli shiny, lacking sculpture. Frontal ridge moderately wide and flat in lateral view, narrowing from middle to anterofrontal ridge. Anterofrontal ridge in middle thicker than frontal ridge. Second antennomere longer than third, as long as fourth.

Pronotum width/length ratio 1.35, wider basally than apically. Slightly convex laterally, without denticle, maximum width near base. Anterolateral callosity low, with obtuse denticle, much lower anteriorly than posteriorly. Posterolateral callosity low, wide. Punctures large, shallow, poorly defined. Interspaces shiny, with some irregularly shaped wrinkles.

Scutellum rounded on top. Elytron without humeral callus; maximum width in males nearly in middle, in females near posterior margin. Apex greatly concave, more so in females than in males. Punctures nearly as large as those on pronotum, their diameter slightly less than or about equal to interpunctal distance. Interspaces shiny, with some wrinkles and punctures.

Male first protarsomere 1.57 times longer than wide, wide in middle, 1.12 times longer than second, 1.12 times longer than third and 0.73 times longer than fourth (visible) protarsomere. Male metatibia 5.08 times as long as wide, curved in dorsal view, with denticles directed posteriorly. First metatarsomere of male 1.96 times shorter than metatibia. Tarsal claw thin, lacking denticle. Metatibial spur as long as third metatarsomere.

Median lobe of aedeagus slightly narrowing in middle, with deep groove ventrally. Ventral groove of the median lobe narrowing abruptly to apical third of median lobe. Apex with narrow, well developed denticle­like structure. In lateral view, apex strongly sinuous, without impression at apical 0.25, tip curved dorsally. In lateral view, median lobe straight.

Spermatheca with receptacle posteriorly nearly as wide as anteriorly, separated from pump only in degree of sclerotization. Internal side of receptacle convex, external straight. Pump with vertical and horizontal parts poorly separated, vertical much shorter than horizontal. Internal side of horizontal part evenly curved. Spermathecal duct basally projecting in direction of receptacle, forming coils distally. Tignum arrowhead shaped posteriorly, wider than anteriorly, nearly parallel sided to anterior end, slightly widening there. Abdominal sternite 8 in female membranous apically and laterally. Vaginal palpus medially curved posteriorly and anteriorly, not widening anteriorly, laterally evenly curved. Abdominal tergites 1 to 3 completely sclerotized. Tergite 1 with clusters of deep pores laterally.

Comments. Longitarsus igori can be separated from all known Testergus by its unique spermathecal pump which lacks a well developed border between the vertical and horizontal parts. Longitarsus igori is most similar to L. danilevskyi . It can be distinguished from L. danilevskyi (in addition to the unique spermathecal pump) by the hair on the apical declivity of the elytra; the punctation on the pronotum being nearly as coarse as that on the elytra; the denticle­like structure on the apex of the median lobe of the aedeagus being relatively narrow and better developed than that in L. danilevskyi . ( Fig. 4 ).

Etymology. This species is named after Igor Lopatin, who collected the only known specimens.

Type material. Holotype ɗ: Southern Tadzhikistan, Gandzhino, 9.IV.1967, I. K. Lopatin (USNM). Paratypes 18 specimens with same label as holotype (16 USNM, 2 ZMAS).

Figures

FIGURES 3 – 11. Median lobe of aedeagus (ventral and lateral views). 3 ­ L. borisi, 4 ­ L. danilevskyi, 5 ­ L. excipennis, 6 ­ L. fuscoaeneus (Armenia). 7 ­ L. igori. 8 ­ L. josiphi. 9 ­ L. nadiae. 10 ­ L. pubescens. 11 ­ L. lederi.

FIGURES 31 – 34. Female abdomen and genitalia of L. igori. 31 ­ spermatheca. 32 ­ abdominal tergites. 33 ­ vaginal palpi. 34 ­ tignum and internal abdominal sclerites.