First record of the “small cave bear” in Bulgaria and the taxonomic status of bears of the Ursus savini ANDREWS – Ursus rossicus BORISSIAK group
|Klíčová slova||Ursus savini, Ursus savini rossicus, small cave bears, Ursus deningeri, cave bears taxonomy, Middle Pleistocene|
|Citace||NIKOLAI, Spassov, HRISTOVA, Latinka, IVANOVA, Stefanka a GEORGIEV, Ivan. First record of the “small cave bear” in Bulgaria and the taxonomic status of bears of the Ursus savini ANDREWS – Ursus rossicus BORISSIAK group. Fossil Imprint / Acta Musei Nationalis Pragae, Series B – Historia Naturalis. Prague: National Museum, 2017, 73(3-4), 275-291. DOI: https://doi.org/10.2478/if-2017-0015. ISSN 2533-4050 (tisk), 2533-4069 (online). Also available from: https://publikace.nm.cz/periodicals/fiamnpsbhn/73-3-4/first-record-of-the-small-cave-bear-in-bulgaria-and-the-taxonomic-status-of-bears-of-the-ursus-savini-andrews-ursus-rossicus-borissiak-group|
The discovery of rich, well preserved skull material in the latest Middle Pleistocene deposits of Mishin Kamik cave (N-W Bulgaria) presents an opportunity for a new analysis of the taxonomy and the phylogeny of the so called “small cave bears”. Not all the small cave bears known would have necessarily had a common origin, the size decrease could be related in a number of cases to a parallelism. The bear from Mishin Kamik is identical with “Ursus rossicus” BORISSIAK from Krasnodar (S. Russia). Both these samples must be referred to U. savini ANDREWS from Bacton near Cromer (England). The specimens from Krasnodar and Mishin Kamik could be classiﬁed as U. sa. rossicus, a late form of the species. This species may have afﬁnities with some Middle Pleistocene Siberian forms. U. savini is a small but very robust spelaeoid bear which is more advanced in a number of features than U. deningeri. In several aspects it attained the evolutional adaptations of the cave bears of the U. spelaeus-U. ingressus group and represents an independent lineage of spelaeoid bears. The Mishin Kamik population was adapted to a mosaic landscape of forests and open areas in hilly terrain. This bear had well developed grazing adaptations but had weak motor abilities.