The Paleozoic problematica Wetheredella and Allonema are two aspects of the same organism
The Paleozoic problematica Wetheredella and Allonema are two aspects of the same organism
复制标题
古生代有问题的 Wetheredella 和 Allonema 是同一生物体的两个方面
DOI:
10.1007/s10347-014-0399-z
复制
发表时间:
2014
期刊:
影响因子:
1.8
通讯作者:
Munnecke
中科院分区:
文献类型:
--
作者:
Jarochowska;Munnecke
Wetheredellais a calcareous encrusting microproblematicum known only from its two-dimensional expression in thin-sections. It occurs in Cambrian through Permian rocks, often in association withRothpletzellaandGirvanella, probable calcifying cyanobacteria. We show thatWetheredellacan be produced by sectioning of the Paleozoicincertae sedissclerobiontAllonema, which has until now been recognized based on its surface, 3D aspect. Therefore, we propose thatWetheredellashould be regarded as a junior synonym ofAllonema. Structures resemblingWetheredellahave also been obtained in thin-sections through another encrusting microproblematicum,Ascodictyon, which, however, differs in the ultrastructure of its wall, which consists of parallel calcite crystals in contrast to radial crystals inAllonema.Allonemaspecimens used in the study were extracted from the Middle Silurian Mulde Brick-clay Member (Gotland, Sweden), representing an off-platform environment below the photic zone. This, together with the primary calcitic, radial wall structure ofAllonemaargues against a cyanobacterial or algal affinity, which had been considered forWetheredella. The taxonomic position ofAllonemaremains unresolved, but the sclerobiont shares many common characteristics with some Paleozoic encrusting foraminifers. Combining the occurrence data onAllonemain its surface aspect and the “Wetheredella” aspect recognized in thin-sections may shed more light on its affinity and paleoecological functions, particularly its association with cyanobacteria and its role as a framework-builder in Paleozoic reefs.
登录
查看更多内容
DOI:
--
发表时间:
1950
期刊:
影响因子:
--
作者:
M. Elias
通讯作者:
M. Elias
影响因子:
2.7
作者:
K. Ratcliffe
通讯作者:
K. Ratcliffe
影响因子:
2
作者:
E. Jarochowska;A. Munnecke
通讯作者:
A. Munnecke
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
E. D. Mulder
通讯作者:
E. D. Mulder
DOI:
10.2517/1342-8144-13.1.023
发表时间:
2009-05
期刊:
--
影响因子:
--
作者:
Y. Ezaki
通讯作者:
Y. Ezaki