Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia

The Baltoscandian lower Palaeozoic succession is well known for the abundance, diversity and excellent preservation of various groups of microfossils, such as acritarchs, chitinozoans, scolecodonts and conodonts. This paper describes a new enigmatic Middle Ordovician organic-walled microfossil Vikis...

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Autores principales:	Olle Hints, Yan Liang, Jaak Nõlvak
Formato:	article
Lenguaje:	EN
Publicado:	Estonian Academy Publishers 2021
Materias:	microfossils fossil eggs middle ordovician darriwilian kunda regional stage baltoscandia. Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/ecb773264ff44cafa8ad230c6f5a3c28
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spelling	oai:doaj.org-article:ecb773264ff44cafa8ad230c6f5a3c282021-11-16T14:59:56ZPossible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia1736-47281736-755710.3176/earth.2021.16https://doaj.org/article/ecb773264ff44cafa8ad230c6f5a3c282021-11-01T00:00:00Zhttps://kirj.ee/wp-content/plugins/kirj/pub/earth-4-2021-240-252_20211116143404.pdfhttps://doaj.org/toc/1736-4728https://doaj.org/toc/1736-7557The Baltoscandian lower Palaeozoic succession is well known for the abundance, diversity and excellent preservation of various groups of microfossils, such as acritarchs, chitinozoans, scolecodonts and conodonts. This paper describes a new enigmatic Middle Ordovician organic-walled microfossil Vikisphaera kundanagen. et sp. nov., characterized by a dark brown to black hollow spherical shell, 90â200 Î¼m in diameter, with an equatorial groove and lack of openings. The specimens of Vikisphaera have been collected from several localities across Baltoscandia including Estonia, Sweden, Latvia and northwestern Russia, and their stratigraphic range is restricted to the Kunda Regional Stage, lower Darriwilian. The wide geographical distribution and short temporal range of Vikisphaera imply its biostratigraphic utility. The shape and characteristics of the shell wall of Vikisphaera are different from those of prasinophytes and other organic-walled microfossils common in lower Palaeozoic rocks. The new microfossil resembles egg shells of some invertebrates, such as arthropods, suggesting that it could represent egg capsules of a group of marine metazoans, possibly soft-bodied creatures with low fossilization potential. However, before the metazoan origin of Vikisphaera is confirmed, it can be considered as an acritarch â an organic-walled microfossil of unknown affinity.Olle HintsYan LiangJaak NõlvakEstonian Academy Publishersarticlemicrofossilsfossil eggsmiddle ordoviciandarriwiliankunda regional stagebaltoscandia.GeologyQE1-996.5ENEstonian Journal of Earth Sciences, Vol 70, Iss 4, Pp 240-252 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	microfossils fossil eggs middle ordovician darriwilian kunda regional stage baltoscandia. Geology QE1-996.5
spellingShingle	microfossils fossil eggs middle ordovician darriwilian kunda regional stage baltoscandia. Geology QE1-996.5 Olle Hints Yan Liang Jaak Nõlvak Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
description	The Baltoscandian lower Palaeozoic succession is well known for the abundance, diversity and excellent preservation of various groups of microfossils, such as acritarchs, chitinozoans, scolecodonts and conodonts. This paper describes a new enigmatic Middle Ordovician organic-walled microfossil Vikisphaera kundanagen. et sp. nov., characterized by a dark brown to black hollow spherical shell, 90â200 Î¼m in diameter, with an equatorial groove and lack of openings. The specimens of Vikisphaera have been collected from several localities across Baltoscandia including Estonia, Sweden, Latvia and northwestern Russia, and their stratigraphic range is restricted to the Kunda Regional Stage, lower Darriwilian. The wide geographical distribution and short temporal range of Vikisphaera imply its biostratigraphic utility. The shape and characteristics of the shell wall of Vikisphaera are different from those of prasinophytes and other organic-walled microfossils common in lower Palaeozoic rocks. The new microfossil resembles egg shells of some invertebrates, such as arthropods, suggesting that it could represent egg capsules of a group of marine metazoans, possibly soft-bodied creatures with low fossilization potential. However, before the metazoan origin of Vikisphaera is confirmed, it can be considered as an acritarch â an organic-walled microfossil of unknown affinity.
format	article
author	Olle Hints Yan Liang Jaak Nõlvak
author_facet	Olle Hints Yan Liang Jaak Nõlvak
author_sort	Olle Hints
title	Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
title_short	Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
title_full	Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
title_fullStr	Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
title_full_unstemmed	Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
title_sort	possible metazoan egg fossils from the darriwilian (middle ordovician) of baltoscandia
publisher	Estonian Academy Publishers
publishDate	2021
url	https://doaj.org/article/ecb773264ff44cafa8ad230c6f5a3c28
work_keys_str_mv	AT ollehints possiblemetazoaneggfossilsfromthedarriwilianmiddleordovicianofbaltoscandia AT yanliang possiblemetazoaneggfossilsfromthedarriwilianmiddleordovicianofbaltoscandia AT jaaknolvak possiblemetazoaneggfossilsfromthedarriwilianmiddleordovicianofbaltoscandia
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Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia

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