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Cellular preservation of excysting developmental stages of new eukaryotes from the early Ediacaran Weng’an Biota

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Cellular preservation of excysting developmental stages of new eukaryotes from the early Ediacaran Weng’an Biota. / Landon, Emma; Pengju, Liu; Yin, Zongjun; Wei-Chen, Sun; Xiao-Dong, Shang; Donoghue, Philip.

In: Palaeoworld, 24.05.2019.

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@article{5f1cbbee9d1b4fb6b3db55266de0599d,
title = "Cellular preservation of excysting developmental stages of new eukaryotes from the early Ediacaran Weng’an Biota",
abstract = "The Ediacaran Weng’an Biota provides a unique window on marine diversity during the interval in which the fundamental animal body plans were being established. Here we describe a previously unreported component of the assemblage, millimeter-scale encysted spheres that exhibit a characteristic but simple slit-shaped excystment mechanism (Sporosphaera guizhouensis n. gen. n. sp.), reminiscent of acritarchs. The cysts contain a large inner body or numerous small discrete membrane-bounded bodies. It is possible that the inner bodies represent disaggregated cells of a multicellular body, like an embryo, but there is no evidence to support this interpretation and the occurrence of the excystment structure is not readily compatible with an embryo interpretation. Rather, we interpret the encysted organisms as multicellular stages within the lifecycle of otherwise probably unicellular eukaryotes. The developmental mode exhibited by Sporosphaera, incorporating a resting stage, implies an adaptation to adverse environmental conditions. This parallels the appearance of Large Ornamented Ediacaran Microfossils (LOEMs) which have been interpreted as diapause stages in the embryology of early animals. Sporosphaera is distinct from LOEMs by ornamentation instead of size, which may implicate that not all LOEMs are animal embryos, if any.",
keywords = "Weng’an Biota, Ediacaran, acritarch, eukaryote, excystment mechanism",
author = "Emma Landon and Liu Pengju and Zongjun Yin and Sun Wei-Chen and Shang Xiao-Dong and Philip Donoghue",
year = "2019",
month = "5",
day = "24",
doi = "10.1016/j.palwor.2019.05.005",
language = "English",
journal = "Palaeoworld",
issn = "1871-174X",
publisher = "Elsevier B.V.",

}

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TY - JOUR

T1 - Cellular preservation of excysting developmental stages of new eukaryotes from the early Ediacaran Weng’an Biota

AU - Landon, Emma

AU - Pengju, Liu

AU - Yin, Zongjun

AU - Wei-Chen, Sun

AU - Xiao-Dong, Shang

AU - Donoghue, Philip

PY - 2019/5/24

Y1 - 2019/5/24

N2 - The Ediacaran Weng’an Biota provides a unique window on marine diversity during the interval in which the fundamental animal body plans were being established. Here we describe a previously unreported component of the assemblage, millimeter-scale encysted spheres that exhibit a characteristic but simple slit-shaped excystment mechanism (Sporosphaera guizhouensis n. gen. n. sp.), reminiscent of acritarchs. The cysts contain a large inner body or numerous small discrete membrane-bounded bodies. It is possible that the inner bodies represent disaggregated cells of a multicellular body, like an embryo, but there is no evidence to support this interpretation and the occurrence of the excystment structure is not readily compatible with an embryo interpretation. Rather, we interpret the encysted organisms as multicellular stages within the lifecycle of otherwise probably unicellular eukaryotes. The developmental mode exhibited by Sporosphaera, incorporating a resting stage, implies an adaptation to adverse environmental conditions. This parallels the appearance of Large Ornamented Ediacaran Microfossils (LOEMs) which have been interpreted as diapause stages in the embryology of early animals. Sporosphaera is distinct from LOEMs by ornamentation instead of size, which may implicate that not all LOEMs are animal embryos, if any.

AB - The Ediacaran Weng’an Biota provides a unique window on marine diversity during the interval in which the fundamental animal body plans were being established. Here we describe a previously unreported component of the assemblage, millimeter-scale encysted spheres that exhibit a characteristic but simple slit-shaped excystment mechanism (Sporosphaera guizhouensis n. gen. n. sp.), reminiscent of acritarchs. The cysts contain a large inner body or numerous small discrete membrane-bounded bodies. It is possible that the inner bodies represent disaggregated cells of a multicellular body, like an embryo, but there is no evidence to support this interpretation and the occurrence of the excystment structure is not readily compatible with an embryo interpretation. Rather, we interpret the encysted organisms as multicellular stages within the lifecycle of otherwise probably unicellular eukaryotes. The developmental mode exhibited by Sporosphaera, incorporating a resting stage, implies an adaptation to adverse environmental conditions. This parallels the appearance of Large Ornamented Ediacaran Microfossils (LOEMs) which have been interpreted as diapause stages in the embryology of early animals. Sporosphaera is distinct from LOEMs by ornamentation instead of size, which may implicate that not all LOEMs are animal embryos, if any.

KW - Weng’an Biota

KW - Ediacaran

KW - acritarch

KW - eukaryote

KW - excystment mechanism

U2 - 10.1016/j.palwor.2019.05.005

DO - 10.1016/j.palwor.2019.05.005

M3 - Article

JO - Palaeoworld

JF - Palaeoworld

SN - 1871-174X

ER -