Redescription of the type specimen of Csakvaromys sciurinus (Rodentia, Sciuridae, Xerinae) from the Late Miocene of Hungary and its bearing on the systematics of early ground squirrels

Maxim V. Sinitsa, Stanislav Čermák

Pages	258–268
DOI	10.37520/fi.2024.020
Keywords	Csakvaromys, Sciuridae, ground squirrels, Miocene, taxonomy
Type of Article	Peer-reviewed
Citation	SINITSA, Maxim V. a ČERMÁK, Stanislav. Redescription of the type specimen of Csakvaromys sciurinus (Rodentia, Sciuridae, Xerinae) from the Late Miocene of Hungary and its bearing on the systematics of early ground squirrels. Fossil Imprint / Acta Musei Nationalis Pragae, Series B – Historia Naturalis. Prague: National Museum, 2024, 80(2), 258–268. DOI: https://doi.org/10.37520/fi.2024.020. ISSN 2533-4050 (tisk), 2533-4069 (online). Also available from: https://www.nm.cz/en/periodicals/fossil-imprint-acta-musei-nationalis-pragae-series-b-historia-naturalis/80-2/redescription-of-the-type-specimen-of-csakvaromys-sciurinus-rodentia-sciuridae-xerinae-from-the-late-miocene-of-hungary-and-its-bearing-on-the-systematics-of-early-ground-squirrels

Fossil Imprint / Acta Musei Nationalis Pragae, Series B – Historia Naturalis | 2024/80/2

Csakvaromys sciurinus is an enigmatic stem ground squirrel from the Late Miocene of Hungary that has previously only been briefly described. The restudy of the holotype allows a detailed redescription and comparison with different xerines. Csakvaromys sciurinus is recognized as a junior synonym of Csakvaromys bredai and diagnosed by the following combination of characters: medium size, close to the maximum limits of C. bredai; massive body of the mandible with deep diastemal portion and shallow diastemal depression; elevated area of the mental foramen; nonconfluent lower and upper masseteric crests separated by the attachment area for the anterior fibers of the anterior deep masseter muscle; transversely compressed lower incisor with longitudinally striated anterior enamel face; and brachyodont cheek teeth with mesoconids, rudimentary entoconids, and well-developed anteroconulid of p4.

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