Зубы теропод из нижнемеловой илекской свиты в Западной Сибири, Россия

А.О. Аверьянов, С.В. Иванцов и П.П. Скучас

Труды Зоологического института РАН, 2019, 323(2): 65–84 · https://doi.org/10.31610/trudyzin/2019.323.2.65

Резюме

Выборка из 136 изолированных зубов из девяти местонахождений нижнемеловой (баррем-апт) илекской свиты Западной Сибири, Россия, может быть разделена на основании морфологических признаков на пять зубных морфотипов, относящихся к пяти или шести таксонам теропод. К морфотипу A отнесены мелкие и крупные боковые зубы со сравнительно крупными дистальными зубчиками и мелкими мезиальными зубчиками. Некоторые их этих зубов могут относиться к Dromaeosauridae, другие – к базальным членам Tyrannosauroidea. Намного меньшие по размерам зубы, отнесенные к морфотипу B, в основном схожи с зубами морфотипа A, но отличаются отсутствием мезиальных зубчиков и мезиальной кариной, либо лингвально смещенной мезиальной кариной. Эти зубы могут принадлежать молодым особям того же таксона дромеозаврид. Зубы отнесенные к морфотипу C также не имеют мезиальных зубчиков и отличаются от зубов морфотипа B уплощенной площадкой на лингвальной стороне, которая также часто имеется и на лабиальной стороне. Эти зубы могут принадлежать либо Troodontidae, либо Microraptorinae, или обоим группам. Мезиальные и латеральные зубы морфотипа E характеризуются отсутствием зубчиков как на мезиальной, так и на дистальной карине. Эти зубы скорее всего принадлежат особому таксону Troodontidae с озублением без зубчиков. Зубы морфотипа D включают мезиальные зубы с мезиальной кариной смещенной лингвально в различной степени и с зубчиками на обоих каринах. Зубы с умеренно смещенной лингвальной кариной могут принадлежать тому же таксону дромеозаврид, к которому относятся боковые зубы морфотипа A. Зубы с более смещенной мезиальной кариной и U-образной формой базального сечения коронки отнесены к неопределимым Tyrannosauroidea.

Ключевые слова

меловой период, Dinosauria, илекская свита, Россия, Theropoda

Поступила в редакцию 17 апреля 2019 г. · Принята в печать 7 мая 2019 г. · Опубликована 25 июня 2019 г.

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