10 Works

Development of the early Cambrian oryctocephalid trilobite Oryctocarella duyunensis from western Hunan, China

Tao Dai, Nigel Hughes, Xingliang Zhang & Shanchi Peng
Abundant articulated specimens of the oryctocarine trilobite Oryctocarella duyunensis from the lower Cambrian (Stage 4, Series 2) Balang Formation at the Bulin section in western Hunan Province, South China, permit the description of all meraspid degrees. The maximum number of thoracic segments observed in this collection is 11. Meraspid growth was accompanied by progressive and gradual change in overall form, and this animal showed an homonomously segmented trunk with variation in the number of pygidial...

Using demographic model selection to untangle allopatric divergence and diversification mechanisms in the Rheum palmatum complex in the Eastern Asiatic Region

Li Feng, Markus Ruhsam, Yi-Han Wang, Zhong-Hu Li & Xu-Mei Wang
Allopatric divergence is often initiated by geological uplift and restriction to sky-islands, climate oscillations, or river capture. However, it can be difficult to establish which mechanism was the most likely to generate the current phylogeographic structure of a species. Recently, genomic data in conjunction with a model testing framework have been applied to address this issue in animals. To test whether such an approach is also likely to be successful in plants we used population...

Data from: Early Cambrian (stage 4) brachiopods from the Shipai Formation in the Three Gorges area of South China

Xiaolin Duan, Marissa Betts, Lars Holmer, Yanlong Chen, Fan Liu, Yue Liang & Zhifei Zhang
Diverse and abundant fossil taxa have been described in the lower Cambrian Shipai Formation in the Three Gorges area of Hubei province, South China, but the diversity of the co-occurring brachiopod fauna and their taxonomy is still far from clear. Here we describe the brachiopod fauna recovered from the Shipai Formation in the Three Gorges area of South China, including representatives of the subphylum Linguliformea: linguloids(Lingulellotreta ergalievi, Eoobolus malongensis and Neobolidae gen. indet. sp. indet.),...

The geometry of resource constraint: an empirical study of the golden snub-nosed monkey

Rong Hou, Colin Chapman, Jessica Rothman, He Zhang, Kang Huang, Songtao Guo, Baoguo Li & David Raubenheimer
1. Apposite conceptualization and measurement of resource variation is critical for understanding many issues in ecology, including ecological niches, persistence and distribution of populations, the structure of communities, and population resilience to perturbations. 2. We apply the nutritional geometry framework to conceptualise and quantify the responses of a temperate-living primate, the golden snub-nosed monkey (Rhinopithecus roxellana) to variation in resource quality and quantity and in nutrient requirements associated with seasonal environments. 3. We present a...

Geometric morphometric analysis of Protoconites minor from the Cambrian (Terreneuvian) Yanjiahe Formation in Three Gorges, South China

Junfeng Guo, Yanlong Chen, Zuchen Song, Zhifei Zhang, Marissa J. Betts, Yajuan Zheng & Xiaoyong Yao
The Ediacaran to Cambrian transition is a critical interval of time during which major evolutionary changes occurred. Recently, abundant Protoconites minor have been recovered from the silty shales of the lower Cambrian Yanjiahe Formation (Terreneuvian, Fortunian – Stage 2) in the Three Gorges area of South China. These fossils represent an important ecological diversification of macroscopic organisms at the onset of the Cambrian. Protoconites minor is a probable cnidarian-grade organism preserved by carbon compression. Herein,...

Strain-hardening effect on critical strain assessment of pipe plastic bending at buckling

M. Zheng & Z.M. Li
In the current paper, the characteristic factor is extracted from the analytical solution of the bending moment for a rectangular strainhardening beam first. Thereafter, the characteristic factor β is transplanted into the previously proposed assessment of the critical buckling strain for rigid-perfectly plastic bending pipe by analogy method, thus an extended expression of the critical buckling strain for a pipe plastic bending including strain-hardening effect is developed. Moreover, available test data is employed to check...

The names don’t matter but the numbers do: searching for stability in Carboniferous brachiopod paleocommunities from the North American Midcontinent

Luke Strotz & Bruce Lieberman
A key question in paleoecology and macroevolution is whether assemblages of species (paleocommunities) are persistent entities that endure over millions of years. Whilst community turnover in the face of abiotic change is the presumed norm, paleocommunities have been shown to persist for long time periods and regardless of environmental disruption. It remains an open question however, as to what processes allow for this. We investigate these questions by analyzing the Carboniferous brachiopod paleocommunities from the...

Data from: An intermediate type of medusa from the early Cambrian Kuanchuanpu Formation, South China

Xing Wang, Jean Vannier, Xiaoguang Yang, Shin Kubota, Qiang Ou, Xiaoyong Yao, Kentaro Uesugi, Osamu Sasaki, Tsuyoshi Komiya & Jian Han
The tetraradial or pentaradial fossil embryos and related hatched individuals from the early Cambrian Kuanchuanpu Formation are of great interest for understanding the early evolution of medusozoans. The phylogenetic and evolutionary significance of their external and internal characters (e.g. manubrium, tentacles, septa and claustra) is still controversial. Here we describe a new pentamerous medusozoan, Hanagyroia orientalis gen. et sp. nov., characterized by five well-developed perradial oral lips around a remarkably large manubrium, a conspicuous equatorial...

Electrochemical and thermodynamic properties of 1-phenyl-3-(phenylamino)propan -1-one with Na2WO4 on N80 Steel

Yun Wang, Lei Zhang, Jun Hu, Jiangli Cao & Minxu Lu
The corrosion inhibition effect and adsorption behavior of 1-phenyl-3-(phenylamino)propan-1-one(PPAPO) on N80 steel in hydrochloric solution have been investigated by Fourier transform infrared (FTIR), electrochemical method and scanning electron microscopy (SEM). The corrosion inhibition mechanism of PPAPO with Na2WO4 was interpreted from the point of view of the thermodynamic. The results indicated that PPAPO with Na2WO4 acted as a mixed type inhibitor. The inhibition film formed on N80 steel surface can increase the charge transfer resistance...

Data from: Cold and hungry: combined effects of low temperature and resource scarcity on an edge-of-range temperate primate, the golden snub-nose monkey

Rong Hou, Colin A. Chapman, Ollie Jay, Songtao Guo, Baoguo Li & David Raubenheimer
Both biotic and abiotic factors play important roles in influencing ecological distributions and niche limits. Where biotic and abiotic stressors co-occur in space and time, homeostatic systems face a different category of challenge in which stressors compound to impose a challenge that is greater than the sum of the separate factors. We studied the homeostatic strategies of the golden snub-nosed monkey (Rhinopithecus roxellana), a species living in temperate deciduous forests at the edge of the...

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