门: 节肢动物门
纲: 软甲纲
目：膜虾目
科: 原虾科
属：鳃虾属
种: 云南鳃虾
描述:
云南鳃虾目前只保存有较大的双瓣壳。其中单个壳体的轮廓近似圆形，背部平直，两端发育有短刺，长度近似相等。短刺不超过壳体的前后边缘。壳体长高比在1.05到1.65范围内，壳体腹部边缘可见较窄的衬里，壳体表面发育有网纹状纹饰。壳体中部可见凸起，根据凸起的程度，可以将云南鳃虾分为两个类型，A型的凸起适中，而B型的凸起较大，壳体最大长度往往超过背部绞合线的范围。这种双型可能代表性双型。身体其它身体部分未知。
Phylum: Arthropoda von Siebold, 1848
Class: Malacostraca Latreille, 1802
Order: Hymenocarina Clarke, 1882
Family: Protocarididae Miller, 1889
Genus: Branchiocaris Resser, 1929
Species: Branchiocaris? yunnanensis Hou, 1987
Description: Branchiocaris? yunnanensis is known from large bivalved carapace. The valves are sub-circular in outline with maximum height in the mid-length of valve. The dorsal margin is straight, with antero- and posterodorsal processes. The dorsal spines are strongly short, subequal in length and not beyond the anterior and posterior margin. The dorsomedian of the valve is convex. The valve L:H ratio from 1.05 to 1.65; the ventral margin process narrow doublure; densely reticulated ornaments outside, honeycombed structure with 3-D aspect of the wall. Convexity of valve may show intraspecific variation. Morph A has the moderate convexity; morph B with a subdorsal swelling, extended above hinge line.
层位：玉案山段筇竹寺组，寒武纪第2统第3阶，Eoredlichia-Wutingaspis带
主要产地: 中国云南东部澄江生物群，包括海口地区的马房、耳材村、尖山，晋宁的二街以及安宁地区的山口。
Period: Cambrian Series 2, Stage 3, Eoredlichia-Wutingaspis Zone (ca. 518 million years ago).
Principal localities: Chengjiang biota (Yu’anshan Member of the Chiungchussu Formation), eastern Yunnan Province, China, including Mafang, Ercai, Jianshan at Haikou area, Erjie at Jinning county, and Shankou at Anning area.
Wu, Y., Fu, D.J., Zhang, X.L., Daley, A.C., Shu, D.G., 2016. Dimorphism of bivalved arthropod Branchiocaris? yunnanensis from the Early Cambrian Chengjiang Biota, South China. Acta Geologica Sinica (English Edition)90: 818–826.
Hou, X., 1987. Early Cambrian large bivalved arthropods from Chengjiang, eastern Yunnan. Acta Palaeontologica Sinica, 26: 286-298.