Morphology of the radiodontan Lyrarapax from the early Cambrian Chengjiang biota
Morphology of the radiodontan Lyrarapax from the early Cambrian Chengjiang biota
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早寒武世澄江生物群放射齿象Lyrarapax的形态
DOI：
10.1017/jpa.2016.67
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发表时间：
2016-07-01
影响因子：
1.4
通讯作者：
Chen, Ailin
中科院分区：
文献类型：
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作者：
Cong, Peiyun;Daley, Allison C.;Chen, Ailin
2014年Cong等人描述的来自澄江生物群（寒武系第二统第三阶）的奇虾类（radiodontan）尖峰虫（Lyrarapax unguispinus）凸显了一种新的额附肢形态类型以及独特的口部结构，这种功能性组合强化了早寒武世奇虾类摄食策略的多样化。在此我们描述了来自同一化石库（Konservat - Lagerstatte）的新种三叶尖峰虫（Lyrarapax trilobus n. sp.）。新种在额附肢内叶的形态和分布以及体瓣的强化结构方面与尖峰虫（L. unguispinus）不同。这两个物种在身体形状（瓣的大小模式）、颈节数量、头甲以及最重要的具有同心皱纹沟的口部特征方面彼此相似。后者证实了无硬化板的软质口部是尖峰虫的一个真实特征，并支持了口部结构在奇虾类中提供有效鉴别特征的观点。
The recently described radiodontan Lyrarapax unguispinus Cong et al., 2014 from the Chengjiang biota (Cambrian Series 2, Stage 3) highlighted a new morphological type of frontal appendage and unique mouth structures, a functional combination reinforcing the diversification of feeding strategies of radiodontans during the early Cambrian. Here we describe Lyrarapax trilobus n. sp. from the same fossil Konservat-Lagerstatte. The new species differs from L. unguispinus in the morphology and distribution of endites on the frontal appendage and the strengthening structure of the body flaps. The two species resemble each other in body shape (pattern of flap size), neck segment number, cephalic plates, and most importantly a mouth characterized by concentric wrinkled furrows. The latter confirms that a soft mouth without sclerotized plates is a real feature of Lyrarapax and supports the idea that oral structures provide valid diagnostic characters within Radiodonta.