A new probable stem lineage crustacean with three-dimensionally preserved soft parts from the Herefordshire (Silurian) Lagerstätte, UK
A new probable stem lineage crustacean with three-dimensionally preserved soft parts from the Herefordshire (Silurian) Lagerstätte, UK
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DOI：
10.1098/rspb.2007.0429
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发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
D. Siveter;M. Sutton;D. Briggs;D. Siveter
中科院分区：
文献类型：
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作者：
D. Siveter;M. Sutton;D. Briggs;D. Siveter
描述了英国赫里福德郡文洛克系(志留系)一种新的节肢动物--Tanazios dokeron，该节肢动物具有三维保存的软部分。连续研磨、数字摄影和计算机渲染技术全面地产生了可供研究的虚拟化石。道克龙的身体标签由头盾和长长的躯干组成。头盾有六对角状的刺，头有五对附肢。触角、触角和下颌骨都是单一的，下颌骨包括下颌骨的髋关节。附属物4和5是二叉的，与躯干的附属物相似：每个附属物都包括一个带有内足的肢基，一个内足和两个上足，外足和内足。菌体中央有一个大的锥形突起，可有一短唇。躯干上有一些节段和至少60对附肢。一种非常小的电针，它的肛门位于其后部的腹侧，也有一个尾部的叉状突起。比较形态和分支分析表明，杜克龙与甲壳动物有亲缘关系，可能属于真甲壳动物的茎类群。因此，T.dokeron中的上足是在真核动物茎分类单元中首次记录的。这个新物种被解释为底栖或底栖食腐动物。
A new arthropod with three-dimensionally preserved soft parts, Tanazios dokeron, is described from the Wenlock Series (Silurian) of Herefordshire, England, UK. Serial grinding, digital photographic and computer rendering techniques yielded ‘virtual fossils’ in the round for study. The body tagmata of T. dokeron comprise a head shield and a long trunk. The head shield bears six pairs of horn-like spines and the head bears five pairs of appendages. The antennule, antenna and mandible are all uniramous, and the mandible includes a gnathobasic coxa. Appendages four and five are biramous and similar to those of the trunk: each comprises a limb base with an endite, an enditic membrane, and two epipodites, plus an endopod and exopod. The hypostome bears a large cone-like projection centrally, and there may be a short labrum. The trunk has some 64 segments and at least 60 appendage pairs. A very small telson has the anus sited ventrally in its posterior part and also bears a caudal furca. Comparative morphological and cladistic analyses of T. dokeron indicate a crustacean affinity, with a probable position in the eucrustacean stem group. As such the epipodites in T. dokeron are the first recorded in a eucrustacean stem taxon. The new species is interpreted as a benthic or nektobenthic scavenger.