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microconchida
The order Microconchida is a group of small, spirally-coiled, encrusting fossil "worm" tubes found from the Upper Ordovician to the Middle Jurassic (Bathonian) around the world.〔〔〔〔〔 They have lamellar calcitic shells, usually with pseudopunctae or punctae and a bulb-like origin. Many were long misidentified as the polychaete annelid ''Spirorbis'' until studies of shell microstructure and formation showed significant differences.〔 All pre-Cretaceous "''Spirorbis''" fossils are now known to be microconchids.〔 Their classification at the phylum level is still debated. Most likely they are some form of lophophorate, a group which includes phoronids, bryozoans and brachiopods. Microconchids may be closely related to the other encrusting tentaculitoid tubeworms, such as ''Anticalyptraea'', trypanoporids and cornulitids.〔
==References==
* Wilson, M.A., Yancey, T.E. and Vinn, O. 2011. "A new microconchid tubeworm from the Lower Permian (Artinskian) of central Texas, USA". ''Acta Palaeontologica Polonica'' 56:785-791 .
* Zaton, M., Wilson, M.A. and Vinn, O. 2012. "Redescription and neotype designation of the Middle Devonian microconchid (Tentaculita) species ''‘Spirorbis’ angulatus'' Hall, 1861". ''Journal of Paleontology'' 86:417-424.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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