DOI: 10.1016/j.palaeo.2016.04.048
论文题名: A hyolithid with preserved soft parts from the Ordovician Fezouata Konservat-Lagerstätte of Morocco
作者: Martí Mus M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 460 起始页码: 122
结束页码: 129
语种: 英语
英文关键词: Fezouata
; Gut
; Hyolithids
; Hyoliths
; Soft parts
; Taphonomy
英文摘要: Hyolithids are an extinct group of early lophotrochozoans with an external skeleton consisting of a conical conch, an externally fitting operculum, and a pair of long, lateral spines named helens. Their phylogenetic position within the lophotrochozoans is unclear, but traditionally they have been regarded as molluscs. Although hyolithids occur in Konservat-Lagerstätten, their soft-part preservation had so far been restricted to the gut. The few known examples suggested that a simple U-shaped gut was characteristic of the group, but new occurrences show a diversity of gut configurations suggesting certain ecological diversity within the group. Here is reported an exceptionally preserved hyolithid specimen from the Ordovician Fezouata Konservat-Lagerstätte of Morocco with a relatively complete gut possibly including an oesophagus, a mouth and a faecal string. Uniquely for hyoliths, other soft parts, likely those associated with the inner surface of the operculum, appear to be preserved as well protruding from the aperture. The anatomy of the preserved soft parts is in accordance with inferences from skeletal anatomy suggesting that hyolithid soft parts did not extend much beyond the aperture, and that only the internal portion of the helens was associated with soft tissues. It is also compatible with lophotrochozoan affinities, but molluscan apomorphies, such as a foot or a radula are not present in the specimen. Taken together, the newly available information suggests that hyolithids may have had a relatively generalized feeding organ, which could adapt to various feeding modes in the suspension-detritus-deposit feeding spectrum. A specialized deposit feeding strategy would be at odds with what is known about hyolithid functional morphology, therefore the presence of a sediment-like infill in the posterior part of the gut of the presently described specimen is puzzling and, as it has been suggested for some Chengjiang taxa, may represent a taphonomic “artefact”. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68265
Appears in Collections: 过去全球变化的重建
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作者单位: Área de Paleontología, Universidad de Extremadura, Avenida de Elvas s/n, Badajoz, Spain
Recommended Citation:
Martí Mus M.. A hyolithid with preserved soft parts from the Ordovician Fezouata Konservat-Lagerstätte of Morocco[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,460