Halysis Høeg, 1932 — an ancestral tabulate coral from the Ordos Basin, North China
| Autor: | Jun-Feng Ren, Hong-Xia Jiang, Lijing Zheng, Zheng-Liang Huang, Hongping Bao, Yasheng Wu, Yue‐Yang Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Morphology
010506 paleontology Morphology (linguistics) ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Wuhai 010502 geochemistry & geophysics 01 natural sciences Halysis Paleontology chemistry.chemical_compound Aulopora Middle Ordovician Tube (container) Sedimentology lcsh:QE701-760 ComputingMethodologies_COMPUTERGRAPHICS 0105 earth and related environmental sciences Calcite biology biology.organism_classification Microstructure Tabulate coral chemistry lcsh:Paleontology Ordovician Taxonomic affinity Geology |
| Zdroj: | Journal of Palaeogeography, Vol 9, Iss 1, Pp 1-15 (2020) |
| ISSN: | 2524-4507 |
| DOI: | 10.1186/s42501-020-00073-x |
| Popis: | The problematic calcareous microfossil Halysis is abundant in the Middle Ordovician Darriwilian Stage of the western edge of the Ordos Basin, North China. The rich and well-preserved specimens of Halysis in this area facilitate detailed studies for its skeletal construction and tube microstructure. Halysis differs from calcified cyanobacteria and calcareous red and green algae in morphology, skeletal construction and microstructure, as well as reproduction mode. Halysis typically consists of multiple juxtaposed parallel tubes arranged in sheets (‘multiple-tube’ type) or is just composed of one tube (‘single-tube’ type). In ‘multiple-tube’ Halysis, tube fission by bifurcation results from the insertion of a microcrystalline wall at the center of a mother tube. This study demonstrates for the first time that the tube walls of Halysis have a laminofibrous (fibronormal) microstructure, composed of fibrous calcite perpendicular to wall surface, and recognizes the ‘single-tube’ type Halysis composed of one tube; in addition, for the first time, this study finds out that ‘multiple-tube’ Halysis develops buddings from the conjunction of two tubes and ‘single-tube’ Halysis shows wide-angle Y-shaped branchings. Based on these findings, this study further compares Halysis with tabulate corals. Halysis appears stratigraphically earlier than Catenipora and Aulopora, and has a smaller tube size. ‘Multiple-tube’ Halysis resembles Catenipora and ‘single-tube’ Halysis resembles Aulopora in skeletal construction and microstructure, and in their tube walls of laminofibrous microstructure composed of fibrous calcite perpendicular to the tube wall surface. Catenipora and Halysis are both characterized by the absence of septal spines. The similarities suggest that Halysis may be the ancestor of Catenipora-like and Aulopora-like tabulate corals. |
| Databáze: | OpenAIRE |
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