Xanthogaleruca aenescens (Fairmaire, 1878)

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

Xanthogaleruca aenescens (Fairmaire, 1878) Figs 1A-C , 2

Galeruca aenescens Fairmaire, 1878: 140 (China).

Galerucella aenescens : Fairmaire 1887: 334 (China: Beijing); Weise 1889: 569 (as synonym of Apophylia thalassina (Faldermann, 1835)); Weise 1896: 296 (note); Weise 1924: 54 (catalogue); Laboissière 1926: 58 (distinct species); Bezděk 2003: 98 (excluded from Apophylia ).

Galerucella (Xanthogaleruca) aenescens : Laboissière 1934: 67; Ogloblin 1936: 100 (redescription).

Pyrrhalta aenescens : Gressitt & Kimoto, 1963: 443 (China: Jilin, Rehe, Hebei, Shandong, Jiangsu); Medvedev and Voronova 1976: 230 (Mongolia); Medvedev and Zaytsev 1978: 135 (larva); Medvedev and Roginskaya 1988: 115 (host plants); Dubeshko and Medvedev 1989: 153; Li 1992: 185 (NE China); Yang 1992: 555 (China: Hunan); Yang et al. 1997: 864 (China: Hubei); Wang and Yang 2006: 109 (China: Gansu); Xue and Yang 2010: 120 (catalogue); Nie et al. 2012: 133 (biology); Yang et al. 2015 (China: Inner Mongolia, Gansu, Shanxi, Shaanxi, Henan).

Pyrrhalta (Pyrrhalta) aenescens : Wilcox 1971: 84

Pyrrhalta (Xanthogaleruca) aenescens : Medvedev 1982: 101 (key), 261; Medvedev 1992: 579 (key).

Xanthogaleruca aenescens : Lopatin et al. 2004: 129 (catalogue); Beenen 2010: 455 (catalogue); Park et al. 2015: 388 (Korea).

Types.

Presumably deposited at the MNHN, but not available for study due to renovation of the roof (Antoine Mantilleri, pers. comm. 2 July 2020); it was studied by Bezděk (2003).

Other material.

China. Beijing: 1♂, 1♀ (TARI), Wofosi (臥佛寺), 27.IV.1961, leg. S.-Y. Wang ; Hebei: 8♂, 13♀ (TARI), 保定 (= Baoding), 5.IX.1943, leg. A. Tanaka ; Tianjin: 1♂, 2♀ (JBCB), Wuquing Co., Dahuanqpu wetland natural conservation, 15.VII.2010, leg. P. Kment ; Manchuria (outdated name, refers to Heilongjiang, Jilin, and Liaoning) : 5♂ (TARI), 4♀ (TARI), Tokuniji , 23.VII.1937, leg. M. Hanano ; 2♂, 2♀ (TARI), Mt. Riutan, Tolisu , 30.V.1937, leg. M. Hanano ; 1♂, 3♀ (TARI), same but with “30.VII.1939”; 1♂ (TARI), Anto , 23.VII.1933, leg. K. Nomura.

Redescription.

Length 8.2-9.5 mm, width 3.9-4.5 mm. Body color (Fig. 1A-C ) yellowish brown; vertex with one rounded black spot at middle, antennae blackish brown but ventral discs of antennomeres IV-VI yellowish brown; pronotum with three large black spots, one spot at center, apically broadened, from basal 1/4 to apical 1/4, two spots laterally; scutellum black; elytra metallic green. Eyes relatively large, interocular space 2.29-2.56 × diameter of eye. Antennae filiform in males (Fig. 2A ), length ratios of antennomeres I-XI 1.0: 0.5: 0.7: 0.8: 0.7: 0.7: 0.7: 0.6: 0.6: 0.5: 0.8, length to width ratios of antennomeres I-XI 3.0: 2.2: 2.7: 3.1: 2.7: 2.9: 2.9: 2.4: 2.5: 2.2: 3.0; similar in females (Fig. 2B ), length ratios of antennomeres I-XI 1.0: 0.5: 0.6: 0.7: 0.7: 0.7: 0.7: 0.6: 0.6: 0.5: 0.8, length to width ratios of antennomeres I-XI 3.3: 2.0: 2.7: 2.9: 2.8: 2.7: 2.7: 2.1: 2.3: 2.0: 2.9. Pronotum and elytra dorso-ventrally depressed. Pronotum 2.0-2.2 × wider than long, disc with dense coarse punctures and short pubescence, with lateral depressions; lateral margins moderately rounded, apical margin slightly concave, basal margin straight. Elytra elongate, parallel-sided, 1.6-1.7 × longer than wide; disc with dense coarse punctures and short pubescence, with three indistinct longitudinal ridges, of which two near suture, one from humerus. Apical spur of tibia of middle leg short (Fig. 2I ); and tarsomere I of front and middle legs not modified in either sex (Fig. 2J, K ). Aedeagus (Fig. 2C, D ) slender in dorsal view, 5.1 × longer than wide, sides asymmetric, gradually broadened from apex to apical 1/5, parallel from apical 1/5 to near base, apex broadly rounded; strongly curved near base in lateral view, moderately broadened from apex to middle, apex narrowly rounded; ostium covered by a more or less sclerotized membrane; primary endophallic sclerite extremely long, 0.9 × as long as aedeagus, with three apical teeth, and additional longitudinal row of erect teeth from middle to base, become smaller towards apex, one short sclerite connected with base, apex with one short tooth. Gonocoxae (Fig. 2E ) transverse, both gonocoxae combined from basal basally connect, with dense short setae along apical margin or areas. Ventrite VIII (Fig. 2F ) extremely transverse; disc with dense short setae along apical margin; spiculum extremely short. Receptacle of spermatheca (Fig. 2L ) very swollen; pump short and strongly curved; sclerotized proximal spermathecal duct wide and short. Apical margin of abdominal ventrite V with angular depression at middle in males (Fig. 2H ), followed by shallow notch; only with semicircle depression in females (Fig. 2G ).

Host plants.

Ulmaceae : Ulmus pumila Linnaeus, U. laevis Pallas, and U. davidiana Planch ( Nie et al. 2012).

Remarks.

adults of X. aenescens (Fairmaire) and X. yuae sp. nov. may be separated from those of other species in the genus by the entirely green elytra, presence of three black spots on the pronotum, elytra with fine and dense punctures. Xanthogaleruca aenescens differs from X. yuae sp. nov. by the wider aedeagus, 5.1 × longer than wide (Fig. 1C, D ) (5.7 × longer than wide (Fig. 3C, D ) in X. yuae sp. nov.), lacking teeth from near apex to middle of primary endophallic sclerite (with teeth from near apex to middle of primary endophallic sclerite in X. yuae sp. nov.), apex of tarsomere I of front legs uniform in both sexes (Fig. 2J, K ) (broader in males of X. yuae sp. nov. (Fig. 3I, J )), and short apical spur on mesotibia (Fig. 2I ) (long apical spur on mesotibia in X. yuae sp. nov. (Fig. 2K ))

Distribution.

Russia (Far East), Mongolia, North China (Gansu, Hebei, Henan, Hunan, Inner Mongolia, Jiangsu, Jilin, Shandong, Shanxi, Shaanxi; Beenen 2010; Yang et al. 2015); Korea ( Park et al. 2015).

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 2. Diagnostic characters of Xanthogaleruca aenescens (Fairmaire) A antenna, male B antenna, female C aedeagus, dorsal view D ditto, lateral view E gonocoxae F abdominal ventrite VIII G abdominal ventrite V, female H abdominal ventrite V, male I apex of tibia of middle leg, male J tarsi of front leg, male K tarsi of front leg, female L spermatheca.

Figure 3. Diagnostic characters of Xanthogaleruca yuae sp. nov. A antenna, male B antenna, female C aedeagus, dorsal view D ditto, lateral view E gonocoxae F abdominal ventrite VIII G abdominal ventrite V, female H abdominal ventrite V, male I tarsi of front leg, male J tarsi of front leg, female K apex of tibia of middle leg, male L spermatheca.