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Complex Unicellular Microfossils from the 1.9 Ga Gunflint Chert, Canada.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Complex Unicellular Microfossils from the 1.9 Ga Gunflint Chert, Canada./
作者:	Flores, Ana L. Gonzalez.
面頁冊數:	1 online resource (246 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-05, Section: A.
Contained By:	Dissertations Abstracts International84-05A.
標題:	Spectrum analysis. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29951610click for full text (PQDT)
ISBN:	9798352983270

Complex Unicellular Microfossils from the 1.9 Ga Gunflint Chert, Canada.
Flores, Ana L. Gonzalez.

Complex Unicellular Microfossils from the 1.9 Ga Gunflint Chert, Canada. - 1 online resource (246 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: A.

Thesis (Ph.D.)--The University of Western Ontario (Canada), 2022.

Includes bibliographical references

The presence of eukaryotic life during the early Paleoproterozoic has been a matter of debate because well-preserved fossils older than 1.8 Ga rarely exhibit eukaryotic cellular microstructures. In this study, microfossils from the 1.9 Ga Gunflint Chert were studied using the extended-focal-depth imaging technique, combined with scanning electron microscopy, resulting in recognition of three types of large (10-35 μm diameter) complex unicellular bodies (CUBs) and one type of "multicellular body" (< 50 μm diameter). The CUBs show the following eukaryotic cyst-like structures: (1) radially arranged internal strands similar to those in some acritarchs and dinoflagellates; (2) regularly spaced long tubular processes, stubby pustules, and/or robust podia on the cell surface; (3) reticulate cell-wall sculpturing such as pits, ridges, and scale-like ornaments; and (4) internal bodies that may represent membrane-bounded organelles. These morphological features provide strong evidence for the presence of protists in the late Paleoproterozoic.Among the three types of CUBs from the Gunflint microbiota, a new species, Germinosphaera gunflinta sp. nov., was recognized. This species has the diagnostic characteristics of Germinosphaera, such as a subrounded to an ellipsoidal cyst, a robust main podium (up to 15 μm), multiple smaller processes, and scale-like ornaments on the surface. Within a broadly continuous lineage of Germinosphaera from the Paleoproterozoic to the early Cambrian, there is a clear increase in cell size from the Paleoproterozoic to the Mesoproterozoic, with the Gunflint species being the smallest and oldest with complex, eukaryote-like, surface ornaments that are well preserved.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798352983270Subjects--Topical Terms:

520440
Spectrum analysis.
Index Terms--Genre/Form:

542853
Electronic books.

Complex Unicellular Microfossils from the 1.9 Ga Gunflint Chert, Canada.
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520 $a The presence of eukaryotic life during the early Paleoproterozoic has been a matter of debate because well-preserved fossils older than 1.8 Ga rarely exhibit eukaryotic cellular microstructures. In this study, microfossils from the 1.9 Ga Gunflint Chert were studied using the extended-focal-depth imaging technique, combined with scanning electron microscopy, resulting in recognition of three types of large (10-35 μm diameter) complex unicellular bodies (CUBs) and one type of "multicellular body" (< 50 μm diameter). The CUBs show the following eukaryotic cyst-like structures: (1) radially arranged internal strands similar to those in some acritarchs and dinoflagellates; (2) regularly spaced long tubular processes, stubby pustules, and/or robust podia on the cell surface; (3) reticulate cell-wall sculpturing such as pits, ridges, and scale-like ornaments; and (4) internal bodies that may represent membrane-bounded organelles. These morphological features provide strong evidence for the presence of protists in the late Paleoproterozoic.Among the three types of CUBs from the Gunflint microbiota, a new species, Germinosphaera gunflinta sp. nov., was recognized. This species has the diagnostic characteristics of Germinosphaera, such as a subrounded to an ellipsoidal cyst, a robust main podium (up to 15 μm), multiple smaller processes, and scale-like ornaments on the surface. Within a broadly continuous lineage of Germinosphaera from the Paleoproterozoic to the early Cambrian, there is a clear increase in cell size from the Paleoproterozoic to the Mesoproterozoic, with the Gunflint species being the smallest and oldest with complex, eukaryote-like, surface ornaments that are well preserved.
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