The mammal-like teeth of the Late Cretaceous lizard<i>Peneteius aquilonius</i>Estes 1969 (Squamata, Teiidae)

Nydam, Randall L.; Gauthier, Jacques A.; Chiment, John

doi:10.1671/0272-4634(2000)020[0628:tmltot]2.0.co;2

Cited by 22 publications

(28 citation statements)

References 16 publications

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“…Their cross-section is circular to slightly widened in transverse direction similarly to both Bicuspidon species (Nydam andCifelli 2002, Folie andCodrea 2005). The degree of widening of the teeth in transverse direction does not reach the extent observed in Polyglyphanodon and Paraglyphanodon (Estes 1983, Nydam 1999, Nydam and Cifelli 2005. Approximately half of their height is projected beyond the labial wall of the bone, slightly less than in B. numerosus and B. hatzegiensis.…”

Section: Description and Comparisonsmentioning

confidence: 81%

“…Its members are taxa like Polyglyphanodon, Paraglyphanodon, Dicothodon, Peneteius (and its synonym Manangyasaurus) and Bicuspidon numerosus from North America, Bicuspidon hatzegiensis (and the Iharkút Bicuspidon) from Europe, Macrocephalosaurus, Darchansaurus, Erdenetosaurus, Adamisaurus and Cherminsaurus from Mongolia (Estes 1983, Nydam 1999, Alifanov 2000, Keqin and Norell 2000, Nydam and Cifelli 2002, Folie and Codrea 2005.…”

Section: Discussionmentioning

confidence: 99%

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

Makádi¹

2006

Acta Geologica Hungarica

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The recently discovered 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 composes 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 East Europe). The Hungarian specimens differ from Bicuspidon numerosus while the latter has bicuspid teeth in the distal part of the tooth row, in contrast with 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 while 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 presently the lack of the needed information allows its determination only as Bicuspidon aff. hatzegiensis.

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Section: Description and Comparisonsmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

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

Makádi¹

2006

Acta Geologica Hungarica

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“…They also differ from Dicothodon which, in addition to the V-shaped ridge (or U-shaped also known in Dicothodon bajaensis), has mesial and distal accessory blades on the tooth crowns (Nydam, 1999;Nydam et al, 2007), and are also completely different from the complex tooth morphology of Peneteius which has teeth with six cusps on the maxillary teeth and peg-like cusps on dentary teeth (Estes, 1969;Nydam et al, 2000;Nydam et al, 2007).…”

Section: Diagnosis As For the Type And Only Known Speciesmentioning

confidence: 99%

A new polyglyphanodontine lizard (Squamata: Borioteiioidea) from the Late Cretaceous Iharkút locality (Santonian, Hungary)

Makádi

2013

Cretaceous Research

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In recent years the Late Cretaceous (Santonian) terrestrial vertebrate locality at Iharkút (western Hungary) has yielded well-preserved remains of lizard taxa besides the remains of fishes, amphibians, turtles, crocodiles, pterosaurs and dinosaurs. Previously the polyglyphanodontine lizard Bicuspidon aff. hatzegiensis has been reported from Iharkút. However, recent excavations at this site produced more lacertilian remains including new polyglyphanodontine material, namely a maxilla and two dentaries which suggest the presence of a new genus in the Iharkút fauna. This previously unknown lizard (described here as Distortodon rhomboideus n. g. n. sp.) is distinct from other polyglyphanodontines such as Bicuspidon, Paraglyphanodon, Polyglyphanodon, Dicothodon and Peneteius. It differs from these genera mainly in having the lingual cusp situated more distally compared to the labial one on its bicuspid teeth located in the distal part of the tooth row, thus the crowns having a unique rhomboidal shape in occlusal view. Distortodon rhomboideus further strengthens the dominance of borioteiioid lizards in the Iharkút fauna. The growing presence of borioteiioids in European localities supports previous theories which suggest some paleobiogeographic connections between the western Tethyan archipelago and North America in the Late Cretaceous. Research highlightsNew lizard remains have been found in the Late Cretaceous of Hungary. The remains show features typical of polyglyphanodontines. Based on some differences between these specimens and previously described genera a new genus and species is described.

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“…In Iharkutosuchus, the tooth crowns are not cylindrical but rectangular in occlusal view (especially the posterior ones), and their mesial and distal sides almost impinge on each other, expanding the relative size of the occluding surface, and thus producing more active food processing. The dentition of Iharkutosuchus differs from those of some heterodont lizards, e.g., Peneteius aquilonius (Nydam et al, 2000) in the lack of a relatively precise fit of the upper and lower multicusped teeth that may be a condition of the significant lateromedial movements of the mandibles.…”

Section: Dental Function and Possible Strokes Of Masticationmentioning

confidence: 93%

“…In mammals, permanent teeth allow a continuous and effective oral processing of the food (Crompton, 1995). In the teiid Peneteius, the suppression of replacement of the molariform teeth was suggested to avoid the decreasing of efficiency of food processing (Nydam et al, 2000). In Iharkutosuchus, however, tooth replacement continued throughout life and, because of the active dental occlusion, it must have been more frequent than in other eusuchians.…”

Section: Dental Function and Possible Strokes Of Masticationmentioning

confidence: 99%

Jaw mechanism and dental function in the late cretaceous basal eusuchian Iharkutosuchus

Ősi

Weishampel

2009

Journal of Morphology

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Iharkutosuchus makadii is a basal eusuchian crocodylian with multicusped teeth discovered from the Upper Cretaceous of Hungary. Skull and dentition morphology indicates an active food processing for this crocodylian. First among crocodylians, a combination of different analyses, including cranial adductor muscle reconstruction, tooth wear pattern, and enamel microstructure studies, is applied here to support this hypothesis. Data provide unambiguous evidence for significant dental occlusion that was a result of a unique, transverse mandibular movement. Reconstruction of the jaw adductors demonstrates strong muscles responsible for slow but active jaw closure as the motor of transverse jaw movement; nevertheless muscles producing rapid jaw closure were reduced. Macrowear orientations show a dominantly transverse movement of the mandibles completed by a slight anteroposterior component. Along with quadrate morphology, macrowear further indicates that this motion was accomplished by alternate rotation of the mandibles about the quadrate condyles. Dental morphology and wear patterns suggest two types of power stroke: a slicing-crushing stroke associated dominantly with anterior tooth-food-tooth contact (with a low degree of transverse mandibular movement) during in the early stage of mastication, and a grinding stroke with significant posterior tooth-tooth contact and a dynamic transverse movement occurring later. The patterns of microwear show a diverse diet for Iharkutosuchus including both soft and hard items. This is also supported by the microstructure of the thick, wrinkled enamel built up mostly by poorly developed columnar units. Based on wear patterns, ontogenetic variation in feeding habits of Iharkutosuchus is also recognized.

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The mammal-like teeth of the Late Cretaceous lizardPeneteius aquiloniusEstes 1969 (Squamata, Teiidae)

Cited by 22 publications

References 16 publications

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

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

A new polyglyphanodontine lizard (Squamata: Borioteiioidea) from the Late Cretaceous Iharkút locality (Santonian, Hungary)

Jaw mechanism and dental function in the late cretaceous basal eusuchian Iharkutosuchus

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