The first tunicate from the Early Cambrian of South China
The first tunicate from the Early Cambrian of South China
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DOI：
10.1073/pnas.1431177100
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发表时间：
2003-07-08
影响因子：
11.1
通讯作者：
Feng, M
中科院分区：
文献类型：
--
作者：
Chen, JY;Huang, DY;Feng, M
本文报道了在昆明(中国南部)发现的一块早寒武世山口克拉瓦化石的8个标本。这种生物的被囊状特征是由一个大的穿孔的鳃篮子，一个囊状的咽周心房，一个在虹吸室的底部有明显的口腔触须的口虹吸管，可能是一个背侧的房孔，以及在咽部中腹面的细长的内花柱来支持的。就像大多数现代的被囊动物一样，肠道是简单的U形，一端与咽部后端相连，另一端与肛门端的心房虹吸管相连。Shankouclava与Cheungkongella不同，Cheungkongella以前被称为被囊动物。根据新的、更完整的“Cheungkongelia”标本显示的分枝触须，这一形式可能是舌形的，而无论如何不是被膜的。
Here we report the discovery of eight specimens of an Early Cambrian fossil tunicate Shankouclava near Kunming (South China). The tunicate identity of this organism is supported by the presence of a large and perforated branchial basket, a sac-like peri-pharyngeal atrium, an oral siphon with apparent oral tentacles at the basal end of the siphonal chamber, perhaps a dorsal atrial pore, and an elongated endostyle on the mid-ventral floor of the pharynx. As in most modern tunicates, the gut is simple and U-shaped, and is connected with posterior end of the pharynx at one end and with an atrial siphon at the other, anal end. Shankouclava differs from Cheungkongella, which was previously called a tunicate. Based on new, more complete "Cheungkongelia" specimens that show branching tentacles, this form may be a lophophorate, and in any case is not a tunicate.