Pyrrhalta tsoui Bezdek & Lee, 2019

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 tsoui Bezdek & Lee, 2019 Figs 23D-F , 25 , 26A

Pyrrhalta tsoui Bezděk & Lee, 2019: 531.

Other material

(specimens examined by Bezděk and Lee (2019) excluded). Taiwan. Nantou: 2♀ (KMNH), Lushan Wenchuan (廬山溫泉), 6.VI.1976, leg. H. Makihara (one identified as P. maculata by Kimoto, 1983) ; 1♂ (TARI), Tsuifeng (翠峰), 12-14.IX.1984, leg. K. S. Lin & S. C. Lin.

Redescription.

Length 4.6-5.3 mm, width 2.3-2.8 mm. Body color (Fig. 23D-F ) reddish brown; vertex with one black spot at center; pronotum with three large black spots, one poorly defined elongate spot at center, from basal 1/3 to middle, one pair laterally; scutellum black; five pairs of large black spots on elytra, one pair near base at middle, two pairs in line with middle, one pair at apical 2/5 laterally, one pair at apical 1/5 near suture; metathoracic ventrites darker. Eyes small, interocular space 2.37-2.42 × diameter of eye. Antennae filiform in males (Fig. 25A ), antennomere I swollen, IV with a large tubercle on outer sides at middle, length ratios of antennomeres I-XI 1.0: 0.5: 0.8: 0.9: 0.7: 0.7: 0.6: 0.6: 0.6: 0.6: 1.0, length to width ratios of antennomeres I-XI 2.1: 1.9: 2.7: 2.6: 2.1: 1.9: 1.6: 1.5: 1.5: 1.4: 2.4; filiform in females (Fig. 25B ), antennomere I and IV not modified, length ratios of antennomeres I-XI 1.0: 0.6: 0.9: 0.8: 0.7: 0.6: 0.6: 0.6: 0.6: 0.6: 1.0, length to width ratios of antennomeres I-XI 2.4: 2.1: 3.4: 2.7: 2.2: 1.9: 1.7: 1.5: 1.6: 1.6: 2.5. Pronotum and elytra convex. Pronotum 1.9-2.0 × wider than long, disc with reticulate microsculpture; dense, extremely coarse punctures and extremely short pubescence; with median longitudinal and lateral depressions; lateral margins moderately rounded, apical and basal margins straight; anterior and posterior setiferous punctures erect. Elytra elongate and broad, parallel-sided, 1.4-1.6 × longer than wide; disc with reticulate microsculpture, and with dense extremely coarse punctures and short pubescence. Apical spur of tibia of middle leg small (Fig. 25E ), tarsomere I not modified in males. Aedeagus (Fig. 25C, D ) extremely slender in dorsal view, 8.4 × longer than wide, sides asymmetric, curved near apex, apex truncate; strongly curved at apical 1/3 and near base in lateral view, apex truncate; ostium not covered by membrane, ventrally located, along lateral margin; two endophallic sclerites elongate, apex of primary endophallic sclerite with several teeth, 0.6 × as long as aedeagus, secondary sclerite much shorter, 0.7 × as long as primary endophallic sclerite, apex acute, with one tooth near apex. Only apices of gonocoxae (Fig. 25J ) sclerotized and transverse, with two long setae at apex of each gonocoxa. Ventrite VIII (Fig. 25F ) transverse; disc with several long setae and dense short setae along apical margin; spiculum long. Receptacle of spermatheca (Fig. 25G ) slightly swollen; pump short and strongly curved; sclerotized proximal spermathecal duct wide and short. Apical margin of abdominal ventrite V truncate, with deeply rounded depression at middle in males (Fig. 25I ); slightly concave in females (Fig. 25H ).

Remarks.

Adults of P. tsoui Bezděk & Lee and P. maculata Gressitt & Kimoto may be separated from others within the species group by the five pairs of large black spots on the elytra (Fig. 23 ), the strongly curved aedeagus in lateral view (Figs 24C , 25C ), and gonocoxa with only two setae (Figs 24H , 25J ). adults of P. tsoui differ from those of P. maculata by the normal antennomere III and antennomere IV with a large tubercle in males (Fig. 25A ) (antennomere III apically broadened in P. maculata (Fig. 24A )), and slender antennomere III, <4.0 × longer than wide in females (Fig. 25B ) (extremely slender antennomere III,> 4.0 × longer than wide; in those of P. maculata (Fig. 24B )). In males of P. tsoui , the apex of the primary endophallic sclerite has several teeth and one additional tooth on the secondary sclerite (Fig. 25C, D ). In P. maculata the primary endophallic sclerite is acute apically, and the secondary sclerite lacks additional teeth (Fig. 24C, D ).

Food plant.

Adults feed on flowers of Meliosma rhoifolia Maxim. ( Sabiaceae ).

Distribution.

This species is widespread in lowlands of Taiwan.

Figures

Figure 23. Habitus of Pyrrhalta maculata Gressitt & Kimoto and P. tsoui Bezdek & Lee A P. maculata, female, dorsal view B ditto, ventral view C ditto, lateral view D P. tsoui female, dorsal view E ditto, ventral view F ditto, lateral view.

Figure 24. Diagnostic characters of Pyrrhalta maculata Gressitt & Kimoto A antenna, male B antenna, female C aedeagus, dorsal view D ditto, lateral view E apex of tibia of middle leg, male F abdominal ventrite VIII G spermatheca H gonocoxae I abdominal ventrite V, female J abdominal ventrite V, male K tarsi of middle leg, male.

Figure 25. Diagnostic characters of Pyrrhalta tsoui Bezdek & Lee A antenna, male B antenna, female C aedeagus, dorsal view D ditto, lateral view E apex of tibia of middle leg, male F abdominal ventrite VIII G spermatheca H abdominal ventrite V, female I abdominal ventrite V, male J gonocoxae.

Figure 26. Field photographs of adults of Pyrrhalta species on host plants A P. tsoui Bezdek & Lee B P. formosanensis sp. nov. C P. semifulva (Jacoby) D P. ishiharai Kimoto.