Hesslandona angustata (Phosphatocopida, Crustacea) from the Upper Cambrian of western Hunan, South China, with comments on phosphatocopid phylogeny
Hesslandona angustata (Phosphatocopida, Crustacea) from the Upper Cambrian of western Hunan, South China, with comments on phosphatocopid phylogeny
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来自中国湖南西部上寒武统的 Hesslandona angustata (Phosphatocopida, 甲壳纲)，以及对 Phosphatocopid 系统发育的评论
DOI：
10.1127/0077-7749/2010/0107
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发表时间：
2011-02
影响因子：
0.8
通讯作者：
Maas, Andreas
中科院分区：
文献类型：
--
作者：
Zhang, Huaqiao;Dong, Xiping;Maas, Andreas
虽然2005年在湖南西部地区首次报道了以Skaracarida和Phosphatocopida为代表的中国寒武纪“Orsten”型保存化石（DONG et al. 2005），但迄今为止，Phosphatocopida的物种尚未得到适当的描述和进化阐明。在这里，我们重新描述的phosphatocopid Hesslandona angustata，最初从瑞典的“奥斯滕”石灰岩描述，根据新的标本与保存的软体细节。两个标本有四对肢，因此代表头部幼虫。根据以前发表的材料和目前的，比较形态学研究的肢体主要内Phosphatocopida完成。作为一个主要的分析结果，一个两个分裂的下颌肢干在年轻的阶段，保留从干种的Labrophora的一个plesiomorphic状态，应该可能是目前在许多phosphatocopid类群，并应被视为一个synapomorphy的Phosphatocopida和Eucrustacea。肢干的两个部分，即基节和腹足，在所有已知的真磷酸类的后期发育阶段彼此融合形成一个不分裂的肢干。在一个'奥斯滕'类型的保存磷脂已经研究了30多年。然而，这个分类群的唯一基于计算机的系统发育分析（MAAS等，2003年）现在是六岁，因此，不包括在中国提出的新数据，在过去的四年。因此，本文完成了新的系统发育分析。在此基础上，我们重新建立了Phosphatocopida的系统发育，并讨论了这组甲壳动物的进化。
Although fossils of 'Orsten'-type preservation from the Cambrian of China represented by Skaracarida and Phosphatocopida were first reported from localities in western Hunan in 2005 (DONG et al. 2005), the species of Phosphatocopida have not been appropriately described and elucidated in terms of evolution so far. Here, we re-describe the phosphatocopid Hesslandona angustata, originally described from Swedish 'Orsten' limestone, based on new specimens with preserved soft-body details. Two specimens have four pairs of limbs and thus represent head larvae. Based on the previously published material and the present one, comparative morphology investigation of limbs mainly within Phosphatocopida is accomplished. As a main result of the analysis a two-divided mandibular limb stem in younger stages, a plesiomorphic state retained from the stem species of Labrophora, should probably be present in many phosphatocopid taxa, and should be regarded as a synapomorphy of Phosphatocopida and Eucrustacea. The two parts of the limb stem, i.e. a coxa and a basipod, become fused with each other to form an undivided limb stem in later developmental stages of all known euphosphatocopids. Phosphatocopids in an 'Orsten' type of preservation have been studied for over 30 years. However the only computer-based phylogenetic analysis of this taxon (MAAS et al. 2003) is now six years old and, therefore, does not include new data brought up in China in the last four years. Accordingly, a new phylogenetic analysis is accomplished herein. Based on the analysis we re-establish the phylogeny of Phosphatocopida and discuss the evolution within this group of crustaceans.
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影响因子：
1.5
作者：
MULLER, KJ
通讯作者：
MULLER, KJ
DOI：
10.1111/j.1755-6724.2004.tb00776.x
发表时间：
2004-12
期刊：
Acta Geologica Sinica ‐ English Edition
影响因子：
--
作者：
Xiping Dong;J. Repetski;S. M. Bergström
通讯作者：
Xiping Dong;J. Repetski;S. M. Bergström
DOI：
10.1017/s0263593300003527
发表时间：
1994
期刊：
Transactions of the Royal Society of Edinburgh: Earth Sciences
影响因子：
--
作者：
M. Williams;D. Siveter;A. Rushton;V. Berg-Madsen
通讯作者：
M. Williams;D. Siveter;A. Rushton;V. Berg-Madsen
影响因子：
2.6
作者：
A. Maas;D. Waloszek
通讯作者：
A. Maas;D. Waloszek
影响因子：
56.9
作者：
D. Siveter;Mark Williams;D. Waloszek
通讯作者：
D. Siveter;Mark Williams;D. Waloszek