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Niche expansion of archaeocyaths during their paleogeographic migration: Evidence from the Chengjiang Biotaстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Yang Aihua, Luo Cui, Han Jian, Zhuravlev Andrey Yu, Reitner Joachim, Sun Haijing, Zeng Han, Zhao Fangchen, Hu Shixue
- Журнал: Palaeogeography, Palaeoclimatology, Palaeoecology
- Год издания: 2024
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 112419
- DOI: 10.1016/j.palaeo.2024.112419
- Аннотация: Archaeocyaths were among the iconic metazoans of the early Cambrian seas and dominated the earliest Phanerozoic reef system before their dramatic decline toward the end of the early Cambrian time (c. 510 million years ago (Ma)). Over their almost 200-year research history, these organisms have been recognized as stenobionts adapted to a very narrow range of carbonate-dominated environments. Here, for the first time, we report archaeocyath-like fossils from the Chengjiang Biota (c. 518 Ma), which was developed on a siliciclastic shelf devoid of any reefal buildups. These fossils are preserved in storm-induced mudstone without evidence of fragmentation during transportation. All of them share the same preservation mode involving replacement by clay minerals and iron oxides but exhibit archaeocyath-type external skeletal features. One species, which used to be interpreted as a dasycladalean alga, shows an aquiferous system and a skeletal ontogeny that is typical of archaeocyaths. It can be assigned to Propriolynthus sp. The other two species are comparable with representatives of the superfamily Ethmocoscinoidea and the family Sigmocyathidae, respectively. Propriolynthus sp. represents the first recognized one-walled archaeocyath in South China and fills a missing link in the migration route of one-walled archaeocyaths, although not in the phase of a reef-builder or dweller. This data reveals new aspects of archaeocyath evolution by niche expansion into siliciclastic-dominated seas at the acme of their diversification.
- Добавил в систему: Журавлев Андрей Юрьевич