First report on Guanshan Biota (Cambrian Stage 4) at the stratotype area of Wulongqing Formation in Malong County, Eastern Yunnan, China

Chen, Feiyang; Zhang, Zhifei; Betts, Marissa J.; Zhang, Zhiliang; Liu, Fan

doi:10.1016/j.gsf.2018.09.010

Cited by 25 publications

(23 citation statements)

References 52 publications

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“…1a). Previous intensive excavations of the Guanshan Konservat-Lagerstätte from the Gaoloufang and Kanfuqing sections near Kunming and Malong 23 have revealed a biota dominated by a rich assemblage of trilobites, bivalved arthropods, palaeoscolecid worms and an assortment of nonmineralized soft-bodied organisms. Aggregated high-density shell-bed concentrations of N. wulongqingensis have now been recovered at a number of localities ( Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

“…1). The Guanshan Biota is unusual in being proportionately dominated by brachiopods 23 , and so, is strongly differentiated from other Cambrian Konservat-Lagertätten such as the Chengjiang, Sirius Passet, Emu Bay Shale and the Burgess Shale, which are euarthropod-dominated assemblages [24][25][26][27] . The organophosphatic linguliform brachiopod Neobolus wulongqingensis sp.…”

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confidence: 99%

“…4f-h; see also ref. 23 ) in the brachiopods indicates rapid burial and minimal transport by episodic obrution deposits 18 . Despite this, the soft body of the tube-dwelling animal is not well-preserved, and its biological affinities are not self-evident.…”

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confidence: 99%

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An encrusting kleptoparasite-host interaction from the early Cambrian

et al. 2020

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Parasite-host systems are pervasive in nature but are extremely difficult to convincingly identify in the fossil record. Here we report quantitative evidence of parasitism in the form of a unique, enduring life association between tube-dwelling organisms encrusted to densely clustered shells of a monospecific organophosphatic brachiopod assemblage from the lower Cambrian (Stage 4) of South China. Brachiopods with encrusting tubes have decreased biomass (indicating reduced fitness) compared to individuals without tubes. The encrusting tubes orient tightly in vectors matching the laminar feeding currents of the host, suggesting kleptoparasitism. With no convincing parasite-host interactions known from the Ediacaran, this widespread sessile association reveals intimate parasite-host animal systems arose in early Cambrian benthic communities and their emergence may have played a key role in driving the evolutionary and ecological innovations associated with the Cambrian radiation.

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Section: Methodsmentioning

confidence: 99%

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An encrusting kleptoparasite-host interaction from the early Cambrian

et al. 2020

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“…Journal of Paleontology 95(1):40-55 of the Wulongqing Formation, there are numerous occurrences of various types of linguloid brachiopod shell aggregations, including Neobolus, Eoobolus, and Shijiangjunthele (Chen et al, 2019;Zhang et al, 2020a, b). They mainly form monotaxic concentrations of intercalated conjoined shell valves in the siliciclastic deposits.…”

Section: Description Of Acrotretoid Shell Beds With Linnarssoniamentioning

confidence: 99%

“…Taxonomic investigation of the well-known Guanshan Biota (Cambrian, Stage 4) from eastern Yunnan of South China starting in 1997 (Luo et al, 1999, 2008), and to date abundant and diverse macroscopic brachiopods (~5 mm in shell length) have been documented from deposits of the Guanshan Biota, including three linguloids ( Eoobolus , Palaeobolus , Neobolus ) (Zhang et al, 2020a, b), one acrotheloid ( Schizopholis ), siphonotretoid ( Acanthotretella ), kutorginid ( Kutorgina ), as well as a nisusioid ( Nisusia ) (Luo et al, 1999, 2008; Hu et al, 2010, 2013; Chen et al, 2019). However, microscopic acrotretoid brachiopods (usually <2 mm in width) have not previously been documented and described from the Wulongqing Formation (Guanshan Lagerstätte, Cambrian Stage 4) (Hu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

First report of acrotretoid brachiopod shell beds in the lower Cambrian (Stage 4) Guanshan Biota of eastern Yunnan, South China

et al. 2020

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Brachiopod shell accumulations are abundant and diverse in the lower Cambrian strata of Yunnan Province, South China, but most commonly they are composed of linguloid and acrotheloid brachiopods. Here, we describe the first record of shell beds with high-density accumulations of microscopic acrotretoid brachiopods (usually <2 mm in width) in the muddy deposits of the Wulongqing Formation (Guanshan Biota, Cambrian Stage 4) in the Wuding area of Yunnan Province. The acrotretoid shell beds from the Wulongqing Formation vary from thin mm-thick pavements to more well-developed beds, several centimeters thick. The occurrence of remarkably rich acrotretoid shell beds indicates that microscopic lingulates began to exert an important role in hardening and paving the soft-substrate seafloor during the early Cambrian evolution of Phanerozoic “mixgrounds.” The new Guanshan material is referred to a new species, Linnarssonia sapushanensis n. sp., which differs from other species of Linnarssonia mainly in having a well-developed internal pedicle tube, as well as a relatively longer dorsal median septum. The occurrence of Linnarssonia sapushanensis n. sp. in the Wulongqing Formation in eastern Yunnan extend the oldest record of the genus on the Yangtze Platform of South China back to at least Cambrian Stage 4. UUID: http://zoobank.org/3e0c3878-6ce2-4eed-87bf-e39647c310c4

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