Atrachya Chevrolat, 1836

Lee, Chi-Feng, 2020, Revision of Taiwanese species of Atrachya Chevrolat, 1836 (Coleoptera, Chrysomelidae, Galerucinae): descriptions of three new genera, two new species, and designations of three new synonyms, ZooKeys 940, pp. 117-159 : 117

Atrachya Chevrolat, 1836

Atrachya Chevrolat, 1836: 401 (type species: Galleruca menetriesii Faldermann, 1835, by monotypy).

Iphidea Baly, 1865: 127 (type species: Iphidea discrepens Baly, 1865, by original designation) (= Galleruca menetriesii Faldermann, 1835. Synonymized by Gressitt and Kimoto (1963)).

Cnecodes Motschulsky, 1858: 99 (type species: Cnecodes bisignatus Motschulsky, 1858, by Weise (1892)) (= Chrysomela bimaculata Hornested, 1788. Synonymized by Weise (1892)). Synonymized by Wagner and Bieneck (2012).

Examined specimens of Atrachya menetriesii

(Faldermann, 1835). Japan. Hiroshima: 1♂ (TARI), Mihara-shi, Yahata-cho, Honjo, 28.VI.2013, leg. H. Suenaga; Hokkaido: 1♂ (TARI), Sapporo-shi, Minami-ku, Kannonzawa, 26.VII.2011, leg. H. Suenaga; Okayama: 1♀ (TARI), Maniwa-shi, Hiruzen, Kamitokuyama, 7.VII.2007, leg. H. Suenaga; 1♀ (TARI), Maniwa-shi, Hiruzen, Utsumi-toge, 20.VII.2013, leg. H. Suenaga; Tokushima: 1♀ (TARI), Minokoshi, Tsurugisan, Miyoshi-shi, 22.VII.2007, leg. S. Sejima; Tottori: 1♂ (TARI), Hoki-cho, Iwatate, Masunizu-kogen, 20.VII.2013, leg. H. Suenaga.

Remarks.

Atrachya is a distinct genus similar to Paleosepharia Laboissière (redefined based on type species by Rizki et al. (2016) and Taiwanese species by Lee (2018)) in possessing elongate antennomere III that is much longer than antennomere II (Fig. 3A, B ) (both antennomeres subequal in length in Monolepta ), the presence of a subscutellar impression or groove on the elytra in males (Fig. 2A-C ) (absent in those of Monolepta ). In addition, females of Atrachya share some genitalic characters with Paleosepharia , including only one pair of bursal sclerites (Fig. 3H ), similar shapes of spermatheca (Fig. 3I ) and gonocoxae (Fig. 3G ). However, members of Atrachya differ from those of Paleosepharia in having uniform tarsomere I of front legs (sexual dimorphic tarsomere I of front legs in Paleosepharia ), almost straight apex of penis in lateral view (Fig. 3D ) (dorsally curved apex of penis in lateral view in Paleosepharia ), deeply incised tectum with strong apical hooks (Fig. 3C ) (apical tapering tectum or weakly incised tectum without apical hooks in Paleosepharia ).

Included species.

Excluding Taiwanese species, 21 species in the African, Palaearctic, and Oriental regions ( Nie et al. 2017). Taxonomic status of species should be reevaluated (see below).

Figures

Figure 2. Habitus of Atrachya menetriesii and Neochya tsoui A A. menetresii, male, dorsal view B same, male, color variation C same, female, dorsal view D N. tsoui, male, dorsal view E same, ventral view F same, female, dorsal view.

Figure 3. Diagnostic characters of Atrachya menetriesii A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F abdominal ventrite VIII G gonocoxae H bursal sclerites I spermatheca.