Small and common: the oldest tropical Chrysomelidae (Insecta: Coleoptera) from the lower Eocene Cambay amber of India

Nadein, K.S. & Perkovsky, E.E. XX.2019. Small and common: the oldest tropical Chrysomelidae (Insecta: Coleoptera) from the lower Eocene Cambay amber of India. Alcheringa XXX, X-X. ISSN 0311-5518. Three new genera and species of flea beetles (Chrysomelidae: Alticini) are described from the lowermost Eocene Cambay amber: Cambaltica paleoindica Nadein, gen. et sp. nov., Protorthaltica setosella Nadein, gen. et sp. nov., and Davidaltica cambayensis Nadein, gen. et sp. nov. These taxa share a zoogeographic affinity with extant Oriental and Afrotropical flea beetle faunas, with similarities to Afrotropical elements interpreted to be a result of Neogene migrations from Laurasia to Africa. The flea beetles within the Cambay amber are characterized by their small body size (1.2-1.9 mm), and the absence or rarity of larger flea beetles in the Cambay amber forest is assumed to be evidence for a progressive increase in the average body size of tropical flea beetles beginning in the early Eocene. Konstantin S. Nadein [k.nadein@gmail.com], University of Kiel, Zoological Institute, Functional Morphology and Biomechanics, Am Botanischen Garten 1-9, Kiel, Germany; Evgeny E. Perkovsky [perkovsk@gmail.com], Schmalhausen Institute of Zoology, National Academy of Science of Ukraine, Bogdana Khmelnitskogo Str. 15, Kiev, Ukraine, Borissiak Paleontological Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 123, Moscow, 117997, Russia.