Xanthogaleruca Laboissiere , 1934

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 Laboissiere, 1934

Galerucella (Xanthogaleruca) Laboissière, 1934: 67 (type species: Chrysomela luteola Müller, 1766, by original designation); Ogloblin 1936: 100; Chûjô 1962: 38.

Pyrrhalta (Xanthogaleruca) : Wilcox, 1965: 36.

Xanthogaleruca : Silfverberg, 1974: 7; Riley et al. 2002: 655; Riley et al. 2003: 72; Beenen 2010: 455.

Included species.

Xanthogaleruca aenescens (Fairmaire, 1878), X. yuae sp. nov., and the additional ca. ten Palaearctic species ( Beenen 2010, 2019; Nie et al. 2012, 2017a; Beenen and Talpur 2019).

Diagnosis.

Large sized species (7.9-9.5 mm). Antenna slender, antennomeres III-VII long (2.5-3.1 × longer than wide), VIII-X shorter. Body flattened (Fig. 1C, F ). Elytra relatively narrower, 1.6-1.8 × longer than wide. Aedeagus (Figs 2C, D , 3C, D ) asymmetrical; ostium covered by a more or less sclerotized membrane; endophallic sclerite composed of a single slender sclerite with base recurved, with one row of stout teeth along lateral margin. Ventrite VIII (Figs 2F , 3F ) in females well sclerotized, with dense short setae along apical margin; spiculum extremely short. Gonocoxae (Figs 2E , 3E ) well sclerotized and with dense short setae along apical margins. Apical margin of abdominal ventrite V with angular depression at middle in males (Figs 2H , 3H ), followed by shallow notch; represented by a semicircular depression in females (Figs 2G , 3G ). Mesotibia with apical spine in males (Figs 2I , 3K ); but mesotarsi with tarsomere I not modified.

Biology.

Larvae and adults feed on leaves of Ulmus species and Zelkova serrata (Thunb.) Makino ( Ulmaceae ).

Remarks.

Tentatively we accept Xanthogaleruca as valid genus. Internal sclerite of aedeagus of Xanthogaleruca is characteristic, comb-like, and presumed to be an apomorphy ( Silfverberg 1974; Beenen 2003, 2008; Matsumura et al. 2017; Beenen and Talpur 2019). Moreover, Nie et al. (2017b) showed phylogenetic distance between Pyrrhalta ( P. rufosanguinea Say, 1827) and Xanthogaleruca ( X. maculicollis (Motschulsky, 1853 and X. aenescens ). See also Discussion below. In addition, larvae of X. yuae sp. nov. pupated on the leaves of the host plant. This differs from the habits of other Taiwanese species of Pyrrhalta that pupate in earthen cells.

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.