New Bivalved Arthropods from the Cambrian (Series 3, Drumian Stage) of Western Hunan, South China
New Bivalved Arthropods from the Cambrian (Series 3, Drumian Stage) of Western Hunan, South China
复制标题
DOI：
10.1111/1755-6724.12306
复制
发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
Huaqiao Zhang;Xi-ping Dong;S. Xiao
中科院分区：
文献类型：
--
作者：
Huaqiao Zhang;Xi-ping Dong;S. Xiao
本文报道了两个新的三维磷酸盐化微体化石，Cambrolongispina reticulata gen. et sp. nov.和Cambrolongispina glabra gen. et sp. nov.，湘西永顺王村中寒武统（第三统，德鲁阶）。它们是双瓣节肢动物，具有薄的，柔韧的，最初是几丁质或几丁质-石灰质的盾牌（c。350-517 μ m长）。盾牌上有一对前后棘。刺的内部是中空的，长度从1/2到C盾的长度不等。reticulata的盾长，C.光滑的C.具网状齿，沿着后缘有一纵列圆锥形或叶片状齿。Cambrolongispina缺乏边缘的轮辋，瓣叶和沟，这是严格意义上的Bradoriida的特征。它也缺乏磷酸类和一些bradoriids的双重/重复特征。它可能与Monteriidae（可能属于Bradoriida sensu lato）有关，两者都具有一对背侧棘。Cambrolongispina可能是小型底栖动物的碎屑食物者，生活在沉积物上或沉积物内。前背棘可能是探测附近捕食者的感觉器官。这些棘上的后齿可能促进了棘的感觉功能。
We report two new three‐dimensionally phosphatized microfossils, Cambrolongispina reticulata gen. et sp. nov. and Cambrolongispina glabra gen. et sp. nov., from the middle Cambrian (Series 3, Drumian Stage) at Wangcun, Yongshun County, western Hunan, South China. They are bivalved arthropods, with thin, pliable, originally chitinous or chitin‐calcareous shields (c. 350–517 μ m long). The shields are equipped with a pair of antero‐dorsal spines. The spines are internally hollow, varying in length from 1/2 of to as long as the shield length in C. reticulata, and uniformly longer than the shield length in C. glabra. The spines of C. reticulata are ornamented with a longitudinal row of conical or blade‐shaped denticles along the posterior edge. Cambrolongispina lacks marginal rims, valve lobation and sulci which are diagnostic of the Bradoriida sensu stricto. It also lacks a doublure/duplicature characteristic of phosphatocopids and some bradoriids. It could be related to the Monasteriidae (which may belong to Bradoriida sensu lato), both characterized by a pair of antero‐dorsal spines. Cambrolongispina may have been meiofaunal detritus feeders that lived on or within sediments. The antero‐dorsal spines may have been sensory organs to detect nearby predators. The posterior denticles on these spines might have facilitated the sensory function of the spines.