A review of the genus Lankaphthona Medvedev, 2001, with comments on the modified phallobase and the unique abdominal appendage of L. binotata (Baly) (Coleoptera, Chrysomelidae, Galerucinae, Alticini)
The flea beetle genus Lankaphthona Medvedev, 2001 is redescribed and a new species L. yunnantarsella sp. nov. Ruan, Konstantinov & Prathapan is described. Longitarsella Medvedev, 2009, syn. nov. and Philotarsa Medvedev, 2009, syn. nov. are newly synonymized with Lankaphthona. Philotarsa laosica Medvedev, 2009, syn. nov. is synonymized with Lankaphthona phuketensis (Gruev, 1989). The following new combinations are proposed: Lankaphthona binotata (Baly, 1876), comb. nov.; Lankaphthona costata (Medvedev, 2016), comb. nov.; Lankaphthona cyanipennis (Medvedev, 2017), comb. nov.; Lankaphthona nigronotata (Jacoby, 1896), comb. nov.; Lankaphthona notatipennis (Medvedev, 2009), comb. nov.; and Lankaphthona phuketensis (Gruev, 1989), comb. nov., status restored. A highly specialized spoon-shaped ‘appendage’ is discovered on the first abdominal ventrite of males of Lankaphthona binotata. Aedeagus of the same species has aberrant sheath-shaped phallobase encircling the median lobe. Morphology and possible function of these structures are discussed. Menispermaceae are newly reported as the host plants of the genus.
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