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A new elasmosaurid plesiosaurian from the Early Cretaceous of Russia marks an early attempt at neck elongationстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или ScopusДата последнего поиска статьи во внешних источниках: 4 августа 2021 г.
- Авторы: Fischer V., Zverkov NG, Arkhangelsky MS, Stenshin IM, Blagovetshensky IV, Uspensky GN
- Журнал: Zoological Journal of the Linnean Society
- Год издания: 2020
- Издательство: Blackwell Publishing Inc.
- Местоположение издательства: United Kingdom
- Номер статьи: zlaa103
- DOI: 10.1093/zoolinnean/zlaa103
- Аннотация: Plesiosaurian marine reptiles evolved a wide range of body shapes during the Jurassic and Cretaceous, including long-necked forms. Many Late Cretaceous members of the clade Elasmosauridae epitomized this part of the plesiosaurian morphological spectrum by evolving extremely long necks through somitogenesis (resulting in an increase in the number of cervical centra) and differential growth (resulting in the elongation of cervical centra). However, the early evolution of elasmosaurids remains poorly understood because of a generally poor Lower Cretaceous fossil record. We describe a new elasmosaurid, Jucha squalea gen. et sp. nov., from the upper Hauterivian (Lower Cretaceous) of Ulyanovsk (European Russia), in addition to other elasmosaurid remains from the same area. Jucha squalea is one of the oldest and basalmost elasmosaurids known and lacks a series of features that otherwise characterize the group, such as the heart-shaped intercoracoid fenestra and the median pectoral bar. However, Jucha squalea marks an early attempt at cervical elongation through differential growth. The data we gathered on the shape of cervical centra among elasmosaurids suggest multiple episodes of elongation and shortening. However, the precise patterns are obscured by an unstable phylogenetic signal.
- Добавил в систему: Зверьков Николай Геннадьевич