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Issue: Vol. 4290 No. 3: 10 Jul. 2017
Type: Article
Published: 2017-07-10
DOI: 10.11646/zootaxa.4290.3.1
Page range: 401–443
Abstract views: 238
PDF downloaded: 10

Coleoptera from the middle-upper Eocene European ambers: generic composition, zoogeography and climatic implications

Department of Zootechny, Kaliningrad State Technical University, Sovetsky Avenue 1. 236000, Kaliningrad, Russia.
Coleoptera Paleogene Neogene beetles extant genera range overlaps palaeoclimate reconstruction ecological zoogeo-graphy

Abstract

The paper contains a review of coleopteran genera known from Baltic, Bitterfeld and Rovno amber localities. Altogether 420 genera (191 extinct and 229 extant) from 78 families are listed from these three Lagerstätten (as of 7 March 2017). The listed beetles were analyzed zoogeographically and distributional maps for 72 genera were compiled. One-quarter (56) of the genera that have survived since the Eocene have cosmopolitan ranges at present; 35 extant genera have been extripated from the Palaearctic since the Eocene. Approximately 40% of beetle genera from the middle-upper Eocene European ambers can be encountered in the wild in present-day Europe, while 5 of these genera are supposed to be European relict endemics originating in Fennosarmatia. The general similarity of the Baltic amber (s.l.) beetle assemblage to modern south Palaearctic fauna is the strongest, the Nearctic elements are more numerous in the middle-upper Eocene European ambers than the Oriental taxa. The simplified Mutual Climatic Range (MCR) method was used for palaeoclimate reconstruction based on fossil beetles. The coleopteran assemblage of Baltic amber is interpreted as indicative of warm temperate, humid, equable climate with reduced thermal seasonality [annual average temperatures range from +10–20˚C; mean of the coldest month temperatures around +10˚C; mean of the hottest month temperature around +20–24˚C; annual precipitation around 750–1500 mm]. The primary importance of high humidity for existence of the Eocene biota is pointed out.

 

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