Morphology of diverse radiodontan head sclerites from the early CambrianChengjiang Lagerstätte, southwest China
Morphology of diverse radiodontan head sclerites from the early CambrianChengjiang Lagerstätte, southwest China
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早寒武世澄江拉格斯泰特多种放射齿动物头部骨片的形态
DOI：
10.1080/14772019.2016.1263685
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发表时间：
2017
影响因子：
2.6
通讯作者：
Zhu M.Y.
中科院分区：
文献类型：
--
作者：
Zeng H.;Zhao F.C.;Yin Z.J.;Zhu M.Y.
记录在保存完好的 Lagerstätten 中的放射牙动物（包括异常动物）是生活在古生代海洋中的世界性软体干群真节肢动物。它们以其独特的形态、奇特的生态和在真节肢动物进化中的基础地位而闻名。寒武纪早期的澄江 Lagerstätte 已经产生了一些最古老的放射齿动物，包括三个无可争议的类群——Anomalocaris saronHouet al., 1995、Amplectobelua symbrachiataHouet al., 1995 和 Lyrarapax unguispinusConget al., 2014——基于有关节的标本。然而，Burgess ShaleHurdiaWalcott（1912 年）和 FezouataAegirocassis benmoulaeVan Royet al.（2015 年）的最新发现强调了另一个放射齿类群（Hurdiidae）的存在，其特征是由一个中心元素和一对侧元素组成的三部分头骨片复合体。在这里，我们描述了来自澄江 Lagerstätte 的可能的水龟头骨片元素的六种形态类型，其中一些与其他典型的放射齿动物身体部位密切相关。这些被认为是核心元素的元素包括同一新属 Tauricornicaris latizonaegen 的两个新种。等十一月和T.oxygonaegen。等11 月，以及前双壳类真节肢动物，Zhenghecaris shankouensis Vannieret al.，2006。另外三个未命名的骨片元素被确定为侧面元素。来自澄江的这些骨片元素提供了详细的解剖结构，例如乳头结节和软组织网状结构，以帮助了解所有龟类头部骨片的形态和生物学。已证实沙龙奇虾和圆白鳅中常见的单一背板。尽管Hurdiidae 的形态多样性中央和侧面元素以及Anomalocarididae + Ampletobeluidae 的保守背板反映了放射齿动物身体计划的主要区别，但它们共享双层角质层的基本结构。澄江标本不仅阐明了放射齿动物头部骨片的总体形态和生物学特征，而且阐明了放射齿动物早期进化史的多样性和差异性。 http://zoobank.org/urn:lsid:zoobank.org:pub:D0590390-A85A-493A-8529-B2DF64D91169
Recorded in exceptionally preserved Lagerstätten, the radiodontans (including anomalocaridids) are cosmopolitan, soft-bodied, stem-group euarthropods that inhabited Palaeozoic seas. They are notable for their unique morphology, peculiar ecology and basal position in euarthropod evolution. The early Cambrian Chengjiang Lagerstätte has yielded some of the oldest radiodontans, including three unquestionable taxa –Anomalocaris saronHouet al., 1995,Amplectobelua symbrachiataHouet al., 1995 andLyrarapax unguispinusConget al., 2014 – based on articulated specimens. However, recent discoveries of the Burgess ShaleHurdiaWalcott, 1912 and the FezouataAegirocassis benmoulaeVan Royet al., 2015 highlight the presence of another radiodontan group (Hurdiidae) characterized by a tripartite head sclerite complex consisting of one central element and a pair of lateral elements. Here, we describe six morphotypes of possible hurdiid head sclerite elements from the Chengjiang Lagerstätte, some of which are closely associated with other typical radiodontan body parts. These, recognized as central elements, include two new species of the same new genus,Tauricornicaris latizonaegen. et sp. nov. andT.oxygonaegen. et sp. nov., and a former bivalved euarthropod,Zhenghecaris shankouensisVannieret al., 2006. Another three unnamed sclerite elements are identified as lateral elements. These sclerite elements from Chengjiang provide detailed anatomy, such as mammillary tubercles and soft-tissue reticulate structure, to help understand the morphology and biology of all hurdiid head sclerites. A common single dorsal plate inAnomalocaris saronandAmplectobelua symbrachiatais confirmed. Although the morphologically diverse central and lateral elements of the Hurdiidae and the conserved dorsal plate of the Anomalocarididae + Amplectobeluidae reflect a major distinction in radiodontan body plans, they share a fundamental structure of double layers of cuticle. The Chengjiang specimens not only clarify the morphology and biology of the radiodontan head sclerites in general, but also illuminate the diversity and disparity of radiodontans in their early evolutionary history.http://zoobank.org/urn:lsid:zoobank.org:pub:D0590390-A85A-493A-8529-B2DF64D91169