Tubes or cell sheet? A 3-D reconstruction of Halysis Høeg, 1932, from the Upper Ordovician of South China

Frisch, Konstantin; Munnecke, Axel; Schulbert, Christian; Zhang, Yuandong

doi:10.1007/s10347-012-0329-x

Facies

2012

DOI: 10.1007/s10347-012-0329-x

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Tubes or cell sheet? A 3-D reconstruction of Halysis Høeg, 1932, from the Upper Ordovician of South China

Konstantin Frisch

Axel Munnecke

Christian Schulbert

et al.

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Cited by 7 publications

(2 citation statements)

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“…In rare cases the growth habit and morphology can be reconstructed using three-dimensional models (Frisch et al 2013), but isolated body fossils are almost never matched with their counterparts in thin sections. A rare exception is the Paleozoic microproblematicum Allonema (Ulrich & Bassler 1904), a calcareous sclerobiont known from rocks of Ordovician through Permian age (Condra & Elias 1944, Kiepura 1965, Simonsen & Cuffey 1980, Jarochowska & Munnecke 2014.…”

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confidence: 99%

Reducing taxonomic noise in problematic fossils: revision of the incertae sedis genus Allonema based on shape analysis

Jarochowska¹,

Hierl²,

Vinn³

et al. 2016

Bull. Geosci.

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Organisms of unknown biological affinity are widespread in Paleozoic ecosystems and play key ecological roles. Recognition of these roles relies on consistent identification and sound taxonomy, yet many microproblematica lack complex morphological features that could be the basis for qualitative taxonomic diagnoses. Allonema is an incertae sedis calcareous sclerobiont widespread in Paleozoic carbonates. At least seven species of Allonema have been proposed, but their diagnoses based on size ranges overlap. In this work, dimensions of 590 individuals from the Silurian of Estonia and Sweden have been measured. Regression analysis of the dimensions revealed two groups, overlapping in size ranges, but differing significantly in proportions. These groups could be matched with previously described A. botellus and A. moniliforme, but both showed a wider range of sizes than previously reported. Another previously described species, A. minimum, fell within the range of dimensions of A. moniliforme and is proposed to be its junior synonym. Differences in proportions revealed in the study do not seem to be dependent on sedimentary environment or local growth conditions such as competition for space, and thus may represent consistent interspecific variability. Although the affinity of Allonema remains unknown, this quantitative approach to its taxonomy reduces unnecessary species in the genus. The success of this approach may encourage its application to other microproblematica populating the fossil record.•

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mentioning

confidence: 99%

Reducing taxonomic noise in problematic fossils: revision of the incertae sedis genus Allonema based on shape analysis

Jarochowska¹,

Hierl²,

Vinn³

et al. 2016

Bull. Geosci.

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“…Halysis, another organism with debated systematic assignment, is discussed by Frisch et al (2013). The specimen-rich samples from Upper Ordovician rocks of South China allowed a detailed investigation.…”

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confidence: 99%

A panorama of the fossil algae: from cyanobacteria and calcimicrobes to the green calcareous algae

Bucur¹,

Fürsich²

2012

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Late Ordovician microbial reefs in the Lianglitag Formation (Bachu, Tarim, NW China)

Zhang

Munnecke

2014

Facies

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Tubes or cell sheet? A 3-D reconstruction of Halysis Høeg, 1932, from the Upper Ordovician of South China

Cited by 7 publications

References 8 publications

Reducing taxonomic noise in problematic fossils: revision of the incertae sedis genus Allonema based on shape analysis

Reducing taxonomic noise in problematic fossils: revision of the incertae sedis genus Allonema based on shape analysis

A panorama of the fossil algae: from cyanobacteria and calcimicrobes to the green calcareous algae

Late Ordovician microbial reefs in the Lianglitag Formation (Bachu, Tarim, NW China)

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