Pyrrhalta schillhammeri, Bezděk & Lee, 2019

Bezděk, Jan & Lee, Chi-Feng, 2019, Revision of Pyrrhalta (Coleoptera: Chrysomelidae: Galerucinae) species with maculate elytra, Zootaxa 4664 (1), pp. 518-534 : 530-531

publication ID	https://doi.org/ 10.11646/zootaxa.4664.4.4
publication LSID	lsid:zoobank.org:pub:8DEC3A3C-193C-4DC4-A968-590F08ED3CD1
persistent identifier	https://treatment.plazi.org/id/9CB87676-96C3-4CAC-90D7-3622C565D86F
taxon LSID	lsid:zoobank.org:act:9CB87676-96C3-4CAC-90D7-3622C565D86F
treatment provided by	Plazi
scientific name	Pyrrhalta schillhammeri
status	sp. nov.

Treatment

Pyrrhalta schillhammeri sp. nov.

( Figs 6 View FIGURES 1–7 , 11, 16, 21 View FIGURES 8–21 , 35 View FIGURES 31–36 )

Type locality. Laos, Champasak prov., Bolavens Plateau, Muang Paksong—B. Nam Thang .

Types examined. Holotype: ♂, “S-LAOS: Prov. Champasak / Bolavens-Plateau / M. Paksong—B. Nam Thang / 26./ 27.5.1996, 800–1100m / leg. Schillhammer (6) [w, p]” ( NMW). The holotype is provided with one additional printed red label: “ HOLOTYPUS, / Pyrrhalta / schillhammeri sp. nov., / Bezděk & Lee, 2019”.

Description. Body length: ♂ 3.7 (holotype).

Male (holotype, Fig. 35 View FIGURES 31–36 ). Head pale brown with middle part of vertex black. Pronotum pale brown with one elongate median and two round lateral black spots. Antennae pale brown with darkened antennomeres IV-VII. Scu- tellum black. Elytra pale brown, each elytron with five brownish-black spots: one small round spot between humerus and scutellum, not touching anterior elytral margin; two round spots along lateral elytral margin; two elongate spots along suture. Legs pale brown. Ventral side: prosternum pale brown, mesoventrite black with brown middle part, metaventrite black with brown posterior margin, abdomen pale brown with lateral parts of each abdominal ventrite black.

Head. Labrum transverse with rounded anterior margin, surface with transverse row of several punctures bearing long pale setae. Anterior clypeal margin weakly concave. Anterior part of head semiopaque, sparsely covered with punctures. Interantennal space narrow, 0.6 times as wide as transverse diameter of antennal insertion. Interocular space 2.5 as wide as transverse diameter of eye. Frontal tubercles subtriangular semiopaque, covered with microsculpture, separated each other by thin sulcus, laterally demarcated by thin furrow, posterior margins continuous with vertex. Vertex dull, covered with microsculpture, small punctures and short setae. Antennae ( Fig. 21 View FIGURES 8–21 ) subclavate, 0.62 times as long as body, length ratios of antennomeres I–XI equal to 13-6-8-8-6 -6-7- 6-7-7-13, last five antennomeres distinctly dilated, antennomeres VIII-X as wide as long, XI twice as long as wide, antennomeres VIII-XI distinctly flattened on ventral sides.

Pronotum transverse, 1.77 times as wide as long, widest at anterior third. Anterior margin widely shallowly concave, lateral margins obtuse angulate with widely rounded middle part, anteriorly and posteriorly convergent and nearly straight, posterior margin weakly concave, lateral part of posterior margin oblique and concave. All margins thinly bordered. Anterior and posterior angles toothed and bearing long pale seta. Surface with distinct elevation along anterior margin, laterally curved posteriorly, disc transversely impressed. Elevation almost glabrous, with irregular small lustrous parts, disc densely covered with small punctures and short setae.

Scutellum subtriangular, with widely rounded apex, surface densely covered with microsculpture, small punctures and short setae.

Elytra moderately convex, parallel, 0.72 as long as body, 1.62 times as long as wide, dull, covered with small confused punctures with interspaces as wide as or narrower than puncture diameters and dense, short pale setae, surface with weakly impressed subscutellar area, rest of surface even. Humeral calli well developed. Epipleura wide, in apical quarter gradually narrowing towards apex, densely covered with short pale setae. Macropterous.

Ventrally semiopaque, covered with longer pale setae. Last abdominal ventrite with deep U-shaped incision.

Legs moderately narrow. Protarsi: protarsomeres I and II subtriangular, short, protarsomere I concave in lateral view, basally with distinct tooth ( Fig. 11 View FIGURES 8–21 ), length ratios of protarsomeres I–IV equal to 6-6-4-7. Mesotarsi: meso- tarsomere I narrow, subparallel, in lateral view axe-shaped, with narrow basal part and expanded apical two thirds, angles of expanded parts pointed ( Fig. 16 View FIGURES 8–21 ), length ratios of mesotarsomeres I–IV equal to 7-6-4-7. Metatarsi: meta- tarsomere I narrow, subtriangular, length ratios of metatarsomeres I–IV equal to 7-6-5-8. Claws bifid.

Aedeagus ( Fig. 6 View FIGURES 1–7 ) relatively narrow, with apical fifth curved left and tip straight, right side of aedeagus nearly straight, subapical part of left side broadly emarginate.

Female unknown.

Differential diagnosis. The habitus of Pyrrhalta schillhammeri sp. nov. is similar to that of P. lucka sp. nov. The males of both species possess subclavate antennae and modified ventral sides of pro- and mesotarsomeres I. Both species differ in the structure of aedeagus. The aedeagus of P. schillhammeri sp. nov. has the apical half narrow and slightly curved left while the aedeagus of P. lucka sp. nov. has an elongate, flat, lanceolate apical half ( Figs 5–6 View FIGURES 1–7 ). The additional similar species, P. tsoui sp. nov. from Taiwan and Laos, has both elytral spots near the suture round (elongate in P. schillhammeri sp. nov.), antennae without distinctly enlarged apical antennomeres (antennae subclavate in P. schillhammeri sp. nov.), and ventral sides of pro- and mesotarsomeres I not modified (modified in P. schillhammeri sp. nov., see Figs 11, 16 View FIGURES 8–21 ).