Pyrrhalta jungchani, Lee & Bezděk, 2021

Lee, Chi-Feng & Bezdek, Jan, 2021, Revision of the genera Xanthogaleruca Laboissiere, 1932 and Pyrrhalta Joannis, 1865 (Coleoptera, Chrysomelidae, Galerucinae) of Taiwan, with type designation of Galerucella lineatipes Takei, ZooKeys 1039, pp. 1-108 : 1

Pyrrhalta jungchani sp. nov. Figs 38A-C , 39 , 40A

Types.

Holotype ♂ (TARI), Taiwan. Pingtung, Tahantrail (大漢林道), 30.VII.2012, leg. J.-C. Chen. Paratypes. Chiayi: 1♀ (TARI), Zengwen Reservoir (曾文水庫), 2.IV.2016, leg. U. Ong; Nantou: 2♀ (NMNS), Juiyenhsi (瑞岩溪), Shuikuan Road (水管路), 19.II.2009, Beating,leg. M. L. Chan; 1♂ (NMNS), same locality, 19-21.II.2009, UV light trap, leg. H. H. Lian & C. D. Tang; 1♀ (TARI), Tsuifeng (翠峰), 23.V.1982, leg. L. Y. Chou; 1♀ (TARI), same locality, 20.IV.1983, leg. K. C. Chou & S. P. Huang; 1♀ (TARI), same as holotype but with “22.XI.2010”; 1♀ (TARI), same but with “13.IX.2012”; 1♀ (TARI), same but with “16.X.2013”; Pingtung: 1♀ (TARI), Lilungshan (里龍山), 5.XI.2009, leg. M.-H. Tsou; 1♀ (TARI), same locality, 28.XI.2009, leg. J.-C. Chen; 1♀ (TARI), same but with “8.I.2010”; 1♂, 1♀ (TARI), same but with “2.III.2012”; 3♀ (TARI), same but with “13.III.2012”; 1♀ (TARI), same but with “27.III.2012”; 1♀ (TARI), same but with “8.I.2013”; 2♂, 4♀ (TARI), Shuangliu (雙流), 14.III.2018, leg. Y.-T. Chung; 2♂, 2♀ (TARI), Tahanshan (大漢山), 18.IV.2018, leg. C.-F. Lee; 1♀ (TARI), same locality, 3.III.2020, leg. Y.-T. Chung; Taitung: 1♀ (TARI), Hsiangyang (向陽), 23.VI.2010, leg. M.-H. Tsou; 1♀ (TARI), same locality, 8.VII.2010, leg. J.-C. Chen; 1♂ (TARI), same but with “12.VII.2012”; 1♀ (TARI), same but with “9.V.2013”; 1♀ (TARI), same but with “17.V.2014”; 1♀ (TARI), Motien (摩天), 23.VI.2010, leg. M.-H. Tsou.

Diagnosis.

Small species, 4.3-5.0 mm in length. Pronotum with three large black spots, one at middle, two laterally. Elytra relatively narrow, 1.7 × longer than wide, disc with dense coarse punctures, with black stripes at humeral calli, with one additional pair of longitudinal dark stripes between humeral calli and suture.

Description.

Length 4.3-5.0 mm, width 1.9-2.3 mm. Body yellowish brown (Fig. 38A-C ); vertex with median longitudinal dark stripe, expanding laterally at base; antennae dark brown, but five or six basal antennomeres paler; pronotum with one pair of large dark spots at lateral depressions, with three small dark spots medially, one pair at apical 1/3, the other at basal 1/3; elytra with three pairs of longitudinal dark stripes, first pair arising from humeral calli, abbreviated at apical 1/3, second pair halfway between first pair and suture, present from base to apical 1/3; third pair along suture, from apical 1/3 to base; those dark spots or stripes more or less reduced in different individuals; lateral margins of femora and tibiae dark brown. Eyes small, interocular space 2.34-2.68 × diameter of eye. Antennae filiform in males (Fig. 39A ), length ratios of antennomeres I-XI 1.0: 0.5: 0.6: 0.5: 0.5: 0.5: 0.5: 0.5: 0.6: 0.6: 0.8, length to width ratios of antennomeres I-XI 2.9: 2.1: 2.2: 1.9: 1.9: 1.9: 1.9: 2.0: 2.0: 2.1: 2.7; similar in females (Fig. 39B ), length ratios of antennomeres I-XI 1.0: 0.5: 0.6: 0.5: 0.5: 0.5: 0.5: 0.6: 0.5: 0.6: 0.8, length to width ratios of antennomeres I-XI 3.3: 2.2: 2.7: 2.3: 2.2: 2.1: 2.1: 2.4: 2.3: 2.4: 3.3. Pronotum and elytra convex. Pronotum 2.0-2.1 × wider than long, with transverse ridge along apical margin deflexed at antero-lateral angles; disc with reticulate microsculpture, and extremely coarse, dense punctures, with one extremely short seta at each puncture; with median longitudinal and lateral depressions; lateral margins moderately rounded, widest at middle, apical and basal margins slightly concave; anterior and posterior setiferous punctures not erect. Elytra broad, parallel-sided, 1.7 × longer than wide; disc smooth, with extremely coarse and dense punctures, and sparse, extremely short pubescence, usually located between punctures; with indistinct ridges along dark stripes. Apical spur of tibia of middle leg small (Fig. 39F ), and tarsomere I modified, axe-shaped in lateral view, narrow basally, and extending to apical 2/3, angles of extended part narrowly rounded in males (Fig. 39H ). Aedeagus (Fig. 39C, D ) slender in dorsal view, 5.3 × longer than wide, asymmetrically lanceolate, slightly curved at middle, strongly narrowed and recurved near apex, apex narrowly rounded; ostium obliquely longitudinal, covered by a membrane; strongly curved near base in lateral view, recurved near apex, apex narrowly rounded; two endophallic sclerites elongate, primary sclerite 0.8 × as long as aedeagus, with dense teeth along apical margin. Secondar sclerite much shorter, 0.3 × as long as secondary sclerite, apex acute. Only apices of gonocoxae (Fig. 39G ) sclerotized, longitudinal, few short setae near base, with six to seven long setae near apex of each gonocoxa. Ventrite VIII (Fig. 39E ) well sclerotized, with dense, short setae along lateral and apical area, short and long marginal setae, spiculum long. Receptacle of spermatheca (Fig. 39K ) slightly swollen and elongate; pump short and strongly curved; sclerotized proximal spermathecal duct narrow and short. Apical margin of abdominal ventrite V slightly concave medially and with deep depression in males (Fig. 39J ); while broadly rounded in females (Fig. 39I ).

Remarks.

Adults of P. jungchani sp. nov. (Fig. 38A ), X. aenescens (Fairmaire) (Fig. 1D ), and P. lineatipes (Takei) (Fig. 45G ) are easily recognized by the three black spots on the pronota. This new species (Fig. 38C ) is most similar to P. lineatipes (Fig. 45I ) based on the brown elytra with a black stripe arising from the humeral calli and convex pronotum and elytra (entirely metallic green elytra and dorso-ventrally flattened pronotum and elytra in X. aenescens (Fig. 1F )). The new species is different from P. lineatipes in possessing sparse pubescence and extremely dense elytral punctures (dense pubescence with sparse elytral punctures in P. lineatipes ), and modified tarsomere I of middle leg in males (Fig. 39H ) (normal tarsomere I of middle leg in males of P. humeralis ). In males of this new species, the aedeagus (Fig. 39C, D ) is similar to that of P. lui sp. nov. (Fig. 40C, D ) with the asymmetrically lanceolate shape and two endophallic sclerites but differs in the recurved apex and shorter secondary endophallic sclerite, 0.3 × as long as primary endophallic sclerite (the straight apex and the longer second endophallic, 0.6 × as long as primary endophallic sclerite, in P. lui sp. nov.).

Food plant.

adults feed on leaves of Viburnum odoratissimum Ker Gawl. ( Adoxaceae ) (Fig. 40A ).

Distribution.

The species is widespread at mid-altitudes (1,500-2,500 m) in central and southern Taiwan.

Etymology.

Dedicated to Mr Jung-Chan Chen who was the first member of TCRT to collect specimens of this new species.

Figures

Figure 1. Habitus of Xanthogaleruca aenescens (Fairmaire) and X. yuae sp. nov. A X. aenescens, female, dorsal view B ditto, ventral view C ditto, lateral view D X. yuae sp. nov., female, dorsal view E ditto, ventral view F ditto, lateral view.

Figure 38. Habitus of Pyrrhalta jungchani sp. nov. and P. shirozui Kimoto A P. jungchani sp. nov., male, dorsal view B ditto, ventral view C ditto, lateral view D P. shirozui, female, dorsal view E ditto, ventral view F ditto, lateral view G Same species, color variation H Same species, color variation I Same species, color variation.

Figure 39. Diagnostic characters of Pyrrhalta jungchani sp. nov. A antenna, male B antenna, female C aedeagus, dorsal view D ditto, lateral view E abdominal ventrite VIII F apex of tibia of middle leg, male G gonocoxae H tarsi of middle leg, male I abdominal ventrite V, female J abdominal ventrite V, male K spermatheca.

Figure 40. Field photographs of Pyrrhalta jungchani sp. nov. and P. lui sp. nov. on host plant A adult of P. jungchani sp. nov. B host plant for P. lui sp. nov., Viburnum parvifolium with feeding marks C adult of P. lui sp. nov. feeding on leaves of V. luzonicum D adult of P. lui sp. nov.

Figure 45. Habitus of Pyrrhalta kobayashii Kimoto and P. lineatipes (Takei) A P. kobayashii, female, dorsal view B ditto, ventral view C ditto, lateral view D P. lineatipes, lectotype, dorsal view E P. lineatipes, paralectotype, dorsal view F P. lineatipes, type labels G P. humeralis, from Taiwan, female, dorsal view H ditto, ventral view I ditto, lateral view.