An amphilestid-grade eutriconodontan from the Middle Jurassic of Russia

Averianov, A. O.; Лопатин, А. В.; Krasnolutskii, Sergei

doi:10.15298/rusjtheriol.07.1.01

Cited by 9 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2005, 2010; Lopatin & Averianov 2005; Averianov & Lopatin 2006), an indeterminate eutriconodontan (Averianov et al . 2008), the dryolestid Anthracolestes sergeii (Averianov et al . 2014), and the stem therian Amphibetulimus krasnolutskii (Lopatin & Averianov 2007; Averianov et al .…”

Section: Methodsmentioning

confidence: 99%

Multituberculate mammals from the Middle Jurassic of Western Siberia, Russia, and the origin of Multituberculata

Averianov

Martin

Лопатин

et al. 2020

Papers in Palaeontology

View full text Add to dashboard Cite

Tashtykia primaeva gen. et sp. nov. and Tagaria antiqua gen. et sp. nov. (Multituberculata incertae sedis) are described based on isolated teeth from the Middle Jurassic (Bathonian) Itat Formation from the Berezovsk coal mine in Krasnoyarsk Territory, Western Siberia, Russia. Tashtykia primaeva gen. et sp. nov. is characterized by a P5 with three rows of cusps (cusp formula 2B:4M:6L) and a high sectorial p4 with two triangular lobes, five serrations associated with labial and lingual ridges, and a unique distal cusp. Tagaria antiqua gen. et sp. nov. differs from all other multituberculates by a very long P5 with flat crown and many cusps arranged in three rows (4B:6M:7L). Morphologically the teeth of Kermackodon and Megaconus are transitional between Euharamiyida and Middle Jurassic Multituberculata. Kermackodon shares several characteristics with Euharamiyida, such as pointed cusps on the molars connected by longitudinal ridges, a distolabial cusp on the M2 that is higher than the other cusps, and a single large sectorial premolar (p4) with a distal basin. The euharamiyidan characters of Megaconus are an ultimate upper premolar with a shorter lingual side, a p4 with a distal basin, and one cusp on the molars being larger than the other cusps. In addition, Megaconus shares an ultimate upper premolar with three rows of cusps, horizontal wear on the molars, and pyramidal cusps on the molars separated by transverse grooves with multituberculates. The multituberculate characters of Kermackodon include horizontal rather than basined wear on the surface of the molars and serrations on the p4.

show abstract

Section: Methodsmentioning

confidence: 99%

Multituberculate mammals from the Middle Jurassic of Western Siberia, Russia, and the origin of Multituberculata

Averianov

Martin

Лопатин

et al. 2020

Papers in Palaeontology

View full text Add to dashboard Cite

show abstract

“…The new genus and species is named in honor of Dr . Hu Yaoming (1966-2008 Included specimens. PIN 5087/6, right upper molariform tooth; PIN 5087/8, a right dentary fragment with the penultimate and antepenultimate molariform teeth and the alveolus for the ultimate tooth.…”

Section: Genus Hutegotherium Gen Novmentioning

confidence: 99%

“…We publish here also a dentary fragment with two teeth of Itatodon tatarinovi which was known formerly by two isolated molariform teeth. The previously known mammal assemblage from Berezovsk included the eleutherodontid allotherians, docodontan Itatodon, indeterminate docodontans, an eutriconodontan, a dryolestid, and the amphitheriid stem zatherian Amphibetulimus (Averianov et al 2005(Averianov et al , 2008Lopatin and Averianov 2005Averianov and Lopatin 2006).…”

Section: Introductionmentioning

confidence: 99%

New docodontans from the Middle Jurassic of Siberia and reanalysis of Docodonta interrelationships

et al. 2010

Self Cite

View full text Add to dashboard Cite

Two new docodontans, Simpsonodon sibiricus sp. nov. and Hutegotherium yaomingi gen. et sp. nov., and a new specimen of Itatodon tatarinovi Lopatin et Averianov, 2005 are described from the Middle Jurassic (Bathonian) Itat Formation of Krasnoyarsk Territory in West Siberia, Russia. A new phylogenetic analysis, incorporating 37 dental and mandibular characters and 18 docodontan and outgroup taxa demonstrated that Itatodon is the most basal known docodontan. Other docodontans can be classified in Docodontidae (Docodon and Haldanodon, with Borealestes recognized as a stem docodontid), Simpsonodontidae fam. nov. (Simpsonodon and Dsungarodon), Tegotheriidae (Krusatodon, Hutegotherium gen. nov., Tegotherium, and Sibirotherium), and Docodonta incertae sedis (Castorocauda, Tashkumyrodon, and Acuoduolodon). Simpsonodontidae fam. nov. is characterized, in particular, by a strongly developed additional groove dorsal to the Meckelian groove. The Middle Jurassic mammals of Laurasia are now known from three principal assemblages: Forest Marble in England, Balabansai in Kyrgyzstan, and Itat in West Siberia. All these three assemblages are very similar and comprise docodontans, allotherians, eutriconodontans, “symmetrodontans,” dryolestidans, and stem zatherians. The Middle Jurassic radiation of mammals has almost no roots in the known Early Jurassic mammal fauna and the evolutionary events which led to formation of the principal groups of Mesozoic mammals (Docodonta, Multituberculata, Eutriconodonta, Dryolestida, and stem Zatheria) should have occurred sometime between the Sinemurian and Bajocian in Laurasia, most probably in Asia (Siberia?).

show abstract

“…A diverse assemblage of vertebrates, including fishes, salamanders, turtles, choristoderes, lizards, crocodyliforms, pterosaurs, dinosaurs, tritylodontids, and diverse mammals has recently been recovered from the Middle Jurassic (Bathonian) Itat Formation, exposed in the Berezovsk Quarry in the south of the Krasnoyarsk Territory, West Siberia (Alifanov et al 2001;Averianov et al 2005Averianov et al , 2008Lopatin and Averianov 2005, 2006, 2007, 2009Skutschas et al 2005;Averianov and Lopatin 2006;Skutschas 2006;Averianov and Krasnolutskii 2009).…”

Section: Introductionmentioning

confidence: 99%

A new basal coelurosaur (Dinosauria: Theropoda) from the Middle Jurassic of Siberia

Averianov

Krasnolutskii²,

Ivantsov

2010

Proceedings ZIN

Self Cite

View full text Add to dashboard Cite

Kileskus aristotocus gen. et sp. nov. from the Middle Jurassic (Bathonian) Itat Formation at Berezovsk Quarry, Krasnoyarsk Territory (West Siberia, Russia), is based on an associated maxilla and premaxilla, a mandible fragment, and some possible associated postcranial elements. Kileskus gen. nov. is referred together with the Middle Jurassic Proceratosaurus from England and the Late Jurassic Guanlong from China to Proceratosauridae fam. nov. (Tyrannosauroidea, Coelurosauria) which is characterized by sagittal nasal crest (unknown for Kileskus gen. nov.), enlarged external nares, short ventral margin of premaxilla, and depth of the antorbital fossa ventral to the antorbital fenestra that is much greater than the depth of the maxilla below the ventral margin of the antorbital fossa. Kileskus gen. nov. is more similar to Proceratosaurus than to Guanlong in having anterodorsal process of the premaxilla inclined slightly anterodorsally and nares inclined posterodorsally, but differs from these two genera by having ascending process of the maxilla confluent with anterior rim of maxillary body and gently sloping posterodorsally. Kileskus gen. nov. has a basal position within the Proceratosauridae. Dilong from the Early Cretaceous of China with a parasagittal nasal crests is the sister taxon for the Proceratosauridae. The new taxon is one of the oldest members of Coelurosauria and Tyrannosauroidea in the fossil record.

show abstract

An amphilestid-grade eutriconodontan from the Middle Jurassic of Russia

Cited by 9 publications

References 7 publications

Multituberculate mammals from the Middle Jurassic of Western Siberia, Russia, and the origin of Multituberculata

Multituberculate mammals from the Middle Jurassic of Western Siberia, Russia, and the origin of Multituberculata

New docodontans from the Middle Jurassic of Siberia and reanalysis of Docodonta interrelationships

A new basal coelurosaur (Dinosauria: Theropoda) from the Middle Jurassic of Siberia

Contact Info

Product

Resources

About