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Acritarchs from the Upper Ordovician of Southern Holy Cross Mountains, Poland

100%

Kremer B.

Acta Palaeontologica Polonica

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2001

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tom 46

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nr 4

Acritarchs and prasinophyceans belonging to eleven genera have been found in the Upper Ordovician (Ashgill) deposits from Zalesie Nowe (Holy Cross Mountains, southern Poland). They are the first representatives of organic-walled plankton described thus far from the uppermost Ordovician/lowermost Silurian strata in the southern part of the Holy Cross Mountains.

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Stratigraphic position of acritarchs from the Lowermost Ordovician of the Holy Cross [Gory Swietokrzyskie] Mts in the light of conodonts studies

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Bednarczyk W. S.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1998

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tom 46

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nr 1

3

Spore-like bodies in some Early Paleozoic acritarchs: clues to chlorococcalean affinities

67%

Kazmierczak J., Kremer B.

Acta Palaeontologica Polonica

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2009

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tom 54

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nr 3

541-551

We present discoveries of internal bodies in problematic Silurian and Devonian organic−walled microfossils classified traditionally as polygonomorph, acanthomorph, sphaeromorph, and herkomorph acritarchs. These bodies are comparable with reproductive structures (autoand/or aplanospores) of modern unicellular green algae (Chlorococcales). Our findings suggest that many of these microfossils may represent asexually reproducing (sporulating) vegetative cells of chlorococcalean algae. The presence of spore−like bodies in the studied acritarchs supports earlier suggestions, based on ultrastructural and biomarker studies, that some acritarchs can be affined with green algae.

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Burgess Shale-type microfossils from the middle Cambrian Kaili Formation, Guizhou Province, China

67%

Harvey T. H. P., Ortega-Hernandez J., Lin J.-P., Yuanlong Z., Butterfield N. J.

Acta Palaeontologica Polonica

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2012

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tom 57

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nr 2

Diverse carbonaceous microfossils, including exceptionally preserved remains of non−biomineralizing metazoans, are reported from a basal middle Cambrian interval of the Kaili Formation (Guizhou Province, China). The application of a gentle acid maceration technique complements previous palynological studies by revealing a larger size−class of acritarchs, a richer assemblage of filamentous microfossils, and a variety of previously unrecovered forms. Metazoan fossils include Wiwaxia sclerites and elements derived from biomineralizing taxa, including chancelloriids, brachiopods and hyolithids, in common with previously studied assemblages from the early and middle Cambrian of Canada. In addition, the Kaili Formation has yielded pterobranch remains and an assemblage of cuticle fragments representing “soft−bodied” worms, including a priapulid−like scalidophoran. Our results demonstrate the wide distribution and palaeobiological importance of microscopic “Burgess Shale−type” fossils, and provide insights into the limitations and potential of this largely untapped preservational mode.

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Late Cambrian acritarch Lusatia: Taxonomy, palaeogeography, and biostratigraphic implications

67%

Albani R., Bagnoli G., Ribecai C., Raevskaya E.

Acta Palaeontologica Polonica

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2007

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tom 52

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nr 4

Intraspecific variability of the herein emended diacrodian acritarch Lusatia dendroidea is described based on late Cambrian (Furongian) well preserved material from Spain, the High Arctic of Russia, and the East−European Platform. L. dendroidea, displays bipolar asymmetric morphology and, as originally defined, consists of three long major processes originating from the “corners” of its vesicle. Specimens with one, two and four major processes are considered to represent morphological variations of the most common three process form. Based on its narrow stratigraphic range, widespread palaeogeographic distribution, and distinctive morphology, L. dendroidea is an excellent guide fossil for the Furongian.

Ograniczanie wyników

4 Acta Palaeontologica Polonica

1 Bulletin of the Polish Academy of Sciences. Earth Sciences

2 Kremer B.

1 Albani R.

1 Bagnoli G.

1 Bednarczyk W. S.

1 Butterfield N. J.

1 Harvey T. H. P.

1 Kazmierczak J.

1 Lin J.-P.

1 Ortega-Hernandez J.

1 Raevskaya E.

1 Ribecai C.

1 Yuanlong Z.

1 2012

1 2009

1 2007

1 2001

1 1998

Acritarchs from the Upper Ordovician of Southern Holy Cross Mountains, Poland

Stratigraphic position of acritarchs from the Lowermost Ordovician of the Holy Cross [Gory Swietokrzyskie] Mts in the light of conodonts studies

Spore-like bodies in some Early Paleozoic acritarchs: clues to chlorococcalean affinities

Burgess Shale-type microfossils from the middle Cambrian Kaili Formation, Guizhou Province, China

Late Cambrian acritarch Lusatia: Taxonomy, palaeogeography, and biostratigraphic implications