Controls on gut phosphatisation: the trilobites from the Weeks Formation Lagerstätte (Cambrian; Utah).
Controls on gut phosphatisation: the trilobites from the Weeks Formation Lagerstätte (Cambrian; Utah).
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DOI：
10.1371/journal.pone.0032934
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Carré M
中科院分区：
文献类型：
--
作者：
Lerosey-Aubril R;Hegna TA;Kier C;Bonino E;Habersetzer J;Carré M
尽管是内部器官，但消化结构经常在寒武纪的Lagerstätten中保存下来。然而，它们重新出现的原因及其生物学意义仍有待深入探讨。这是特别真实的节肢动物-典型的寒武纪生态系统中最多样化的生物体-消化结构代表了一个尚未充分利用的替代附属物形态推断其生物学。在这里，我们描述了磷酸化消化结构的三叶虫物种从寒武纪周形成Lagerstätte（犹他州）。它们精致的三维保存揭示了三叶虫内部解剖学的独特细节，例如嘴的位置和没有分化的作物。此外，还首次报道了一种未知功能的成对臀管器官的存在。这种特殊的材料可以探索肠道磷酸化与生物体生物学之间的关系。事实上，软组织的保存在这些化石中是不寻常的，因为它仅限于消化结构，这表明肠道在其自身的磷酸化中发挥了核心作用。我们假设肠道提供了一个微环境，特殊条件可以发展和窝藏磷的来源。肠道磷酸化几乎只在节肢动物中观察到，这一事实可以解释为它们在消化组织中储存离子（包括磷）的能力不寻常。然而，在威克斯组的一些标本中，磷酸化延伸到整个消化系统，这表明三叶虫可能有一些在现代节肢动物中没有观察到的生物学特性。我们推测，其中之一可能是肠道组织中离子储存能力的增加，这与它们重矿化甲壳的蜕皮有关。
Despite being internal organs, digestive structures are frequently preserved in Cambrian Lagerstätten. However, the reasons for their fossilisation and their biological implications remain to be thoroughly explored. This is particularly true with arthropods – typically the most diverse fossilised organisms in Cambrian ecosystems – where digestive structures represent an as-yet underexploited alternative to appendage morphology for inferences on their biology. Here we describe the phosphatised digestive structures of three trilobite species from the Cambrian Weeks Formation Lagerstätte (Utah). Their exquisite, three-dimensional preservation reveals unique details on trilobite internal anatomy, such as the position of the mouth and the absence of a differentiated crop. In addition, the presence of paired pygidial organs of an unknown function is reported for the first time. This exceptional material enables exploration of the relationships between gut phosphatisation and the biology of organisms. Indeed, soft-tissue preservation is unusual in these fossils as it is restricted to the digestive structures, which indicates that the gut played a central role in its own phosphatisation. We hypothesize that the gut provided a microenvironment where special conditions could develop and harboured a source of phosphorus. The fact that gut phosphatization has almost exclusively been observed in arthropods could be explained by their uncommon ability to store ions (including phosphorous) in their digestive tissues. However, in some specimens from the Weeks Formation, the phosphatisation extends to the entire digestive system, suggesting that trilobites might have had some biological particularities not observed in modern arthropods. We speculate that one of them might have been an increased capacity for ion storage in the gut tissues, related to the moulting of their heavily-mineralised carapace.
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影响因子：
2
作者：
Filimonova, S. A.
通讯作者：
Filimonova, S. A.
影响因子：
1.8
作者：
Garcia-Bellido, Diego C.;Vannier, Jean;Collins, Desmond
通讯作者：
Collins, Desmond
影响因子：
2.7
作者：
ALLISON, PA
通讯作者：
ALLISON, PA
影响因子：
2.6
作者：
Garcia-Bellido, Diego C.;Paterson, John R.;Lee, Michael S. Y.
通讯作者：
Lee, Michael S. Y.
DOI：
10.1098/rstb.1981.0164
发表时间：
1981-01-01
影响因子：
6.3
作者：
BRUTON, DL
通讯作者：
BRUTON, DL