Longitarsus nadiae, 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 : 28-29

Longitarsus nadiae sp. nov.

( Figs. 1, 2 , 9 , 39–43 )

Description. Length 1.31–2.23 mm, width 0.69–1.04 mm. Dorsum black with greenish metallic tint, pronotum concolorous with elytra. Legs dark brown, pro­ and mesotibia nearly as dark as pro­ and mesofemora, particularly in middle, metafemur slightly darker than pro­ and mesofemora. Antennae entirely dark brown.

Vertex strongly shagreened. Antennal callus as dark, but slightly 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, parallel sided, not 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 1.28, basally wider 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 small, shallow, poorly defined. Interspaces uneven, with some irregularly shaped, shallow 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 larger than those on pronotum, their diameter slightly less than or about equal to interpunctal distance. Interspaces shiny, with some wrinkles and punctures.

Male first protarsomere 1.46 times longer than wide, wide in middle, 1.29 times longer than second, 1.57 times longer than third and 0.78 times longer than fourth (visible) protarsomere. Male metatibia 4.50 times as long as wide, curved in dorsal view, with denticles directed posteriorly. First metatarsomere of male 2.16 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 slightly anterior to middle of median lobe. Apex without denticle­like structure. In lateral view, apex slightly sinuous, without impression at apical 0.25, tip curved dorsally. In lateral view, median lobe straight near base, angulate posteriorly.

Spermatheca with receptacle nearly cylindrical, posteriorly nearly as wide as anteriorly, separated from pump by distinct border. Internal side of receptacle slightly convex, external straight. Pump with vertical and horizontal parts well separated, vertical shorter than horizontal. Internal side of horizontal part evenly convex. Spermathecal duct basally projecting in direction of receptacle, forming a few coils distally. Anterior apex of tignum abruptly expanded, much wider than posterior apex. Tignum not well sclerotized posteriorly, from anterior widening nearly parallel sided, widening slightly just before entering sternite 8. Abdominal sternite 8 in female membranous apically and laterally. Vaginal palpus medially curved posteriorly and anteriorly, not widening anteriorly, laterally straight in middle curving posteriorly and (to lesser degree) anteriorly. Abdominal tergites 1 to 3 completely sclerotized. Tergite 1 with clusters of deep pores laterally.

Comments. Longitarsus nadiae can be separated from all known Testergus by the unique anterior apex of the tignum being abruptly expanded. It is most similar to L. tmetopterus and, in addition to the unique apex of the tignum, can be distinguished from L. tmetopterus by the greenish tint in the color of elytra; and the more slender median lobe of the aedeagus with a flat apex being much less curved in lateral view than that of L. tmetopterus . ( Fig. 14 ).

Etymology. This species is named after my daughter, Nadia.

Type material. Holotype ɗ: Kirgizstan, Kirgizsky mountains, Tswou Aryk 23.VI.2002. leg. Snizek (DCAG). Paratypes 8 specimens with same label as holotype (2 DCAG, 4 USNM, 2 ZMAS).

Figures

FIGURES 1 – 2. Longitarsus nadiae, habitus. 1 ­ male, 2 ­ female.

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 39 – 43. Female abdomen and genitalia of L. nadiae. 39 ­ spermatheca. 40 ­ vaginal palpi. 41 ­ tignum and internal abdominal sclerites. 42 ­ abdominal sternites. 43 ­ abdominal tergites.

FIGURES 12 – 16. Median lobe of aedeagus (ventral and lateral views). 12 ­ L. sengloki. 13 ­ L. sogdianus. 14 ­ L. tmetopterus. 15 ­ L. truncatellus. 16 ­ L. turkomanorum.