Dimorphism of Bivalved Arthropod Branchiocaris? Yunnanensis from the Early Cambrian Chengjiang Biota, South China

被引：0

作者：

WU Yu ^{[1
]}

FU Dongjing ^{[1
]}

ZHANG Xingliang ^{[1
]}

Allison C.DALEY ^{[2
,3
]}

SHU Degan ^{[1
]}

机构：

[1] Early Life Institute and State Key Laboratory of Continental Dynamics, Department of Geology,Northwest University

[2] Oxford University Museum of Natural History

[3] Department of Zoology, University of Oxford

来源：

Acta Geologica Sinica(English Edition) | 2016年 / 03期

关键词：

South China; Yunnanensis from the Early Cambrian Chengjiang Biota; Dimorphism of Bivalved Arthropod Branchiocaris;

D O I：

暂无

中图分类号：

Q915 [古动物学];

学科分类号：

0709 ; 070903 ;

摘要：

The bivalved arthropod Branchiocaris? yunnanensis Hou, 1987 is redescribed on the basis of new fossil material from the early Cambrian Chengjiang biota, South China. In total, 81 specimens have been examined. The carapace comprises two identical valves, each valve are sub-circular in outline, ranging from 24 mm to 58 mm in length, and from 15 mm to 46 mm in height. The dorsal margin is straight and bears two short cardinal spines. The valve surface is either smooth or ornamented with polygonal reticular structures, which may result from different preservation conditions. Two morphotypes have been recognized based on the presence or absence of a subdorsal swelling of the valve, which is convex dorsolaterally and extends beyond the dorsal margin when it appears. Statistic and ontogenetic analyses show both morphotypes grow isometrically and have the same growth trajectory. Therefore, the two morphotypes are interpreted as dimorphism within the same species. Our results are helpful for investigating the taxonomy and ontogeny of arthropod fossils and suggest that dimorphism might be fairly common in these early arthropods.

引用

页码：818 / 826

页数：9

共 22 条

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