DOI: 10.1016/j.palaeo.2013.08.016
论文题名: The developmental cycles of early Cambrian Olivooidae fam. nov. (? Cycloneuralia) from the Yangtze Platform (China)
作者: Steiner M. ; Qian Y. ; Li G. ; Hagadorn J.W. ; Zhu M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 398 起始页码: 97
结束页码: 124
语种: 英语
英文关键词: Cambrian
; Cycloneuralia
; Embryos
; Larvae
; Life cycle
; Small shelly fossils
英文摘要: Eggs, embryos, and hatchlings of olivooids are common and distinctive components of the earliest Cambrian small shelly fossil assemblage (Anabarites trisulcatus-Protohertzina anabarica Zone) at the northern and northwestern edge of the Yangtze Platform. Embryos are preserved in 3D as phosphatized permineralizations with superficial cellular structures. Nanofocus X-ray computed tomography reveals that diagenetic structures characterize the interior of most phosphatized eggs and embryos. The Olivooidae fam. nov. is herein distinguished from the possibly related hexaconulariids. Statistical size investigations and morphological studies indicate that at least three, but possibly five or more species of olivooids occur in the early Cambrian of South China. Fossilized smooth egg stages reflect a high biodiversity, encompassing 8-10 or more biological species. Eggs and embryos of Olivooides multisulcatus, Olivooides mirabilis and Quadrapyrgites quadratacris are represented by distinct and characteristic size clusters. The size ranges of embryonic parts of hatchlings roughly correspond to the size clusters of the embryos. From reconstruction of the developmental series of Olivooides multisulcatus it appears that the cleavage mode of olivooids was transitional between superficial and total cleavage. Late embryos and hatchlings of Olivooides multisulcatus and Olivooides mirabilis are characterized by pentaradial symmetry, whereas tubes of Quadrapyrgites quadratacris exhibit tetraradial symmetry. Tubular hatchlings of olivooids may represent larval or adult stages, or perhaps, nonfeeding larvae. Although the biological affinity of olivooids is weakely constrained, we hypothesize that they belong within an extinct clade of the Cycloneuralia. Their assignment to the Cnidaria is considered unlikely. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69434
Appears in Collections: 过去全球变化的重建
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作者单位: Freie Universität Berlin, Department of Earth Sciences, Malteserstrasse 74-100, Haus D, 12249 Berlin, Germany; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Academia Sinica, 210008 Nanjing, China; Department of Earth Sciences, Denver Museum of Nature and Science, Denver, CO 80205, United States
Recommended Citation:
Steiner M.,Qian Y.,Li G.,et al. The developmental cycles of early Cambrian Olivooidae fam. nov. (? Cycloneuralia) from the Yangtze Platform (China)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,398