Dianulites Eichwald, 1829
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https://doi.org/ 10.5252/geodiversitas2022v44a20 |
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urn:lsid:zoobank.org:pub:5EC74771-0B7B-494D-ADC8-79BECD097A3A |
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https://doi.org/10.5281/zenodo.6723049 |
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https://treatment.plazi.org/id/865C87FD-FFAB-FFE9-3B19-FCC04D5DFA02 |
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Dianulites Eichwald, 1829 |
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Genus Dianulites Eichwald, 1829 View in CoL
TYPE SPECIES. — Dianulites detritus Eichwald, 1829 [syn. of D. fastigiatus View in CoL ] by subsequent designation ( Eichwald 1860). Lower to Middle Ordovician; Russia, Estonia.
DIAGNOSIS. — Colony turbinate, cone or horn-shaped, sometimes compound, occasionally with a conical central cavity, in some species massive hemispherical; zooecia opening on upper, distal surface of colony; colony sides comprising exterior wall; not differentiated into endozone and exozone; maculae variably developed, some monticulate. Zooecia long polygonal tubes, monomorphic or obscurely polymorphic; walls thin, indistinct, granular, inclusion-rich; styles lacking; diaphragms moderately abundant, microstructural fabric strongly radial (modified after Taylor & Wilson 1999).
OCCURRENCE. — Lower to Upper Ordovician; Europe, North and South America, Asia.
COMPARISON
Dianulites Eichwald, 1829 belongs to its own family ( Vinassa de Regny 1921). It shows similarities to the unplaced genus Nicholsonella Ulrich, 1890 . These genera possess re-crystallized walls which suggest a diagenetically unstable aragonitic ( McKinney 1971) or high Mg calcite composition ( Taylor & Wilson 1999; Smith et al. 2006). Nicholsonella differs from Dianulites by having abundant mesozooecia and acanthostyles.
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