Gilsonicaris from the Lower Devonian Hunsrück slate is a eunicidan annelid and not the oldest crown anostracan crustacean.
Gilsonicaris from the Lower Devonian Hunsrück slate is a eunicidan annelid and not the oldest crown anostracan crustacean.
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DOI：
10.1098/rsbl.2023.0312
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发表时间：
2023-08
期刊：
影响因子：
3.3
通讯作者：
中科院分区：
文献类型：
--
作者：
德国东南部亨斯鲁克的下泥盆统(下埃米西亚，−400Myr)屋顶石板提供了高度多样化和保存异常完好的海洋动物群，为各种古生代动物的解剖和生态提供了独特的快照。然而，所描述的几个分类群的亲和力仍然是个谜，至少在用X射线射线照相术或微型计算机断层照相术(µCT)发现隐藏在板岩表面下的新的黄铁矿特征之前是这样。在这里，我们重新描述了这样一个谜一样的化石--可能是Anostracan甲壳类Gilsonicaris rhenanus Van Straelen，1943。使用µCT扫描，我们揭示了其前所未有的解剖细节，包括腹侧口腔开口和四对顽固的颌骨元素。这些颌骨在形态上与Eunicidan多毛类的头齿一致，结合对身体和头部的大体解剖，明确地将G.rhenanus识别为多毛类而不是节肢动物。虽然这一发现坚定地摒弃了化石记录中早泥盆世关于冠齿齿类的记录，但它增加了一种新的优尼科软组织记录，考虑到头齿类丰富的微化石记录，这种软组织令人惊讶地罕见。
The Lower Devonian (Lower Emsian, −400 Myr) roof slates of the Hunsrück in southeastern Germany have delivered a highly diverse and exceptionally preserved marine fauna that provides a unique snapshot into the anatomy and ecology of a wide range of Palaeozoic animals. Several of the described taxa, however, remain enigmatic in their affinity, at least until new pyritized features hidden under the surface of the slate are revealed using X-ray radiography or micro-computed tomography (µCT). Here, we redescribe such an enigmatic fossil, the putative anostracan crustacean Gilsonicaris rhenanus Van Straelen, 1943. Using µCT scanning, we unveil unprecedented details of its anatomy, including a ventral oral opening and four pairs of recalcitrant jaw elements. These jaws are morphologically consistent with the scolecodonts of eunicidan polychaetes, which along with the gross anatomy of the body and head unambiguously identifies G. rhenanus as a polychaete rather than an arthropod. While this discovery firmly discards the Early Devonian record of crown anostracans in the fossil record, it adds a new record of eunicidan soft tissues, which are surprisingly rare considering the abundant microfossil record of scolecodonts.
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影响因子：
3.5
作者：
Clark EG;Hutchinson JR;Briggs DEG
通讯作者：
Briggs DEG
影响因子：
1.2
作者：
Tzetlin, AB
通讯作者：
Tzetlin, AB
DOI：
10.1073/pnas.1632658100
发表时间：
2003-08-05
影响因子：
11.1
作者：
Lichtenegger, HC;Schöberl, T;Stucky, GD
通讯作者：
Stucky, GD
DOI：
10.1098/rspb.2019.1247
发表时间：
2019-07-24
影响因子：
4.7
作者：
Parry, Luke A.;Edgecombe, Gregory D.;Vinther, Jakob
通讯作者：
Vinther, Jakob
DOI：
10.1098/rstb.1926.0005
发表时间：
1926-04-01
影响因子：
--
作者：
Scourfield, DJ
通讯作者：
Scourfield, DJ