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A new tetraradial olivooid (Medusozoa) from the lower Cambrian (Stage 2) Yanjiahe Formation, South China
Journal of Paleontology ( IF 1.3 ) Pub Date : 2019-12-27 , DOI: 10.1017/jpa.2019.101 Junfeng Guo , Jian Han , Heyo Van Iten , Zuchen Song , Yaqin Qiang , Wenzhe Wang , Zhifei Zhang , Guoxiang Li , Yifei Sun , Jie Sun
Octapyrgites elongatus n. gen. n. sp., a relatively rare, tetraradial olivooid (Cnidaria, Medusozoa), is described from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) near Yichang, China. Although similar to Olivooides and Quadrapyrgites from the Fortunian Stage in consisting of a partially corrugated (longitudinal) periderm with a quadrate (transverse) apical portion and V-shaped apertural lobes, O . elongatus is substantially larger than other olivooids. The elongate apical region of O . elongatus is similar to four-sided Anaconularia anomala (Barrande, 1867), though with a flat tip that may have been an adaption for a sessile mode of life. As in other olivooids, embryonic development in O . elongatus may have been direct. Last, the paucity of olivooids and the absence of pentaradial cnidarians and carinachitids in Cambrian Stage 2 indicate a marked decline in the disparity of cnidarians near the Fortunian–Cambrian Age 2 boundary, when by contrast bilaterians underwent rapid diversification.UUID: http://zoobank.org/60acc2f9-44f8-4a97-9449-960ad76f8fff
更新日期:2019-12-27
Journal of Paleontology ( IF 1.3 ) Pub Date : 2019-12-27 , DOI: 10.1017/jpa.2019.101 Junfeng Guo , Jian Han , Heyo Van Iten , Zuchen Song , Yaqin Qiang , Wenzhe Wang , Zhifei Zhang , Guoxiang Li , Yifei Sun , Jie Sun