Abstract
Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
Highlights
Various types of organic-walled microfossils are abundant and diverse in lower Palaeozoic carbonate rocks of the Baltic region
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 kundana gen. et sp. nov., characterized by a dark brown to black hollow spherical shell, 90–200 μm in diameter, with an equatorial groove and lack of openings
Summary
Various types of organic-walled microfossils (chitinozoans, foraminiferans, acritarchs, prasinophytes, scolecodonts, melanosclerites, hydroids and others) are abundant and diverse in lower Palaeozoic carbonate rocks of the Baltic region. Hundreds of micropalaeontological samples from tens of sections in the Baltic region have been collected and studied from this time span in order to trace the distribution and reconstruct the regional diversification history of chitinozoans and scolecodonts (Hints 2000; Paris et al 2004; Hints & Eriksson 2007; Hints et al 2018). In addition to these two groups, many other microfossils have been picked from the samples and stored for future study
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