Onychophoran-like musculature in a phosphatized Cambrian lobopodian

Onychophoran-like musculature in a phosphatized Cambrian lobopodian
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磷化寒武纪叶足动物中的甲虫样肌肉组织

DOI:
10.1098/rsbl.2016.0492
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发表时间:
2016-09
期刊:
影响因子:
3.3
通讯作者:
Jin-Bo Hou
Jin-Bo Hou
中科院分区:
生物学2区
文献类型:
--
作者:
Xi-Guang Zhang;Martin R. Smith;Jie Yang;Jin-Bo Hou

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现代爪龙有限的陆地分布与保存下来的种类丰富的爪龙类化石形成鲜明对比。在海相寒武纪Lagersta¨tten。从这些早期祖先到现代甲爪龙的身体结构的转变很少受到限制,部分原因是缺乏保存软解剖细节的化石。在这里,我们报道了一种新的早寒武纪(第3阶段)翼足动物,Tritonychus phanerosarkus gen. et sp. nov.的肌肉组织,通过磷酸盐的三维复制以Orsten方式保存。这是关于古生代爪龙肌肉组织的第一份报告,确立了外周肌肉组织是祖先全节肢动物的一个特征,但记录了一个意想不到的肌肉结构。系统发育分析重建了T. phanerosarkus,认为它是主要爪龙谱系的少数成员之一,在寒武纪时期和今天一样罕见和神秘。
The restricted, exclusively terrestrial distribution of modern Onychophora contrasts strikingly with the rich diversity of onychophoran-like fossils preserved.in marine Cambrian Lagersta¨tten. The transition from these early forebears to the modern onychophoran body plan is poorly constrained, in part owing to the absence of fossils preserving details of the soft anatomy.Here, we report muscle tissue in a new early Cambrian (Stage 3) lobopodian,Tritonychus phanerosarkus gen. et sp. nov., preserved in the Orsten fashion by three-dimensional replication in phosphate. This first report of Palaeozoic onychophoran musculature establishes peripheral musculature as a characteristic of the ancestral panarthropod, but documents an unexpected muscular configuration. Phylogenetic analysis reconstructs T. phanerosarkus as one of a few members of the main onychophoran lineage—which was as rare and as cryptic in the Cambrian period as it is today.
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