Bicuspidon aff. hatzegiensis (Squamata: Scincomorpha: Teiidae) from the Upper Cretaceous Csehbánya Formation (Hungary, Bakony Mts)

László Makádi

doi:10.1556/ageol.49.2006.4.5

Acta Geologica Hungarica

Volume/Issue:: Volume 49: Issue 4

Bicuspidon aff. hatzegiensis (Squamata: Scincomorpha: Teiidae) from the Upper Cretaceous Csehbánya Formation (Hungary, Bakony Mts)

Author:

László Makádi

László Makádi Department of Paleontology, Eötvös Loránd University H-1117 Budapest, Pázmány P. sétány 1/c, Hungary

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Pages:: 373–385

Online Publication Date:: 12 Jun 2007

Publication Date:: 01 Dec 2006

Article Category:: Research Article

DOI:: https://doi.org/10.1556/ageol.49.2006.4.5

Keywords:: Hungary; Polyglyphanodontinae; Bakony Mts; Upper Cretaceous; lizards; Bicuspidon; Csehbánya Formation

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The recently encountered Upper Cretaceous (Santonian) Iharkút terrestrial vertebrate locality has yielded several vertebrate taxa since its discovery. Scincomorphan lizards are also represented in this fauna by several jaw fragments. The most abundant of these is represented by seven dentary fragments and an indeterminate jaw fragment with characteristic teeth. The hypertrophied splenial, the heterodont dentition, the cementum deposition at the bases of the teeth, and the large subcircular resorption pits assign this type to the family Teiidae. The dentition is composed of conical, monocuspid teeth in the mesial region and transversely widened bicuspid teeth in the distal region. This morphology is well known in members of the subfamily Polyglyphanodontinae. Based on their dental morphology the Iharkút finds can be easily assigned to the genus Bicuspidon. This genus is known from two species, B. numerosus Nydam et Cifelli 2002 from the Albian-Cenomanian of Utah (North America) and B. hatzegiensis Folie et Codrea 2005 from the Maastrichtian of the Hat¸eg Basin (Transylvania, eastern Europe). The Hungarian specimens differ from Bicuspidon numerosus in that the latter has bicuspid teeth in the distal part of the tooth row, in contrast to the Hungarian species, which has two monocuspid teeth in the distal region, one equal to the size of the preceding teeth, and one less than half the size of the former one. The presence of monocuspid teeth at the end of the tooth row resembles B. hatzegiensis, but since the very end of the tooth row of the latter is not known it is not possible to determine if B. hatzegiensis also has two monocuspid teeth distally. Thus it is not impossible that the Hungarian specimens represent a new species, but at present the lack of necessary information allows its determination only as Bicuspidon aff. hatzegiensis.

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Acta Geologica Hungarica

Print ISSN:: 0236-5278

Online ISSN:: 1588-2594

Acta Geologica Hungarica
Language	English
Size
Year of Foundation	1952
Publication Programme	changed title
Volumes per Year
Issues per Year
Founder	Magyar Tudományos Akadémia
Founder's Address	H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher	Akadémiai Kiadó
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5278 (Print)
ISSN	1588-2594 (Online)