A new small soft-bodied non-trilobite artiopod from the Cambrian Stage 4 Guanshan Biota

Geological Magazine ◽

10.1017/s0016756821001254 ◽

2021 ◽

pp. 1-5

Author(s):

De-Guang Jiao ◽

Kun-Sheng Du ◽

Xi-Guang Zhang ◽

Jie Yang ◽

Daniel Eggink

Keyword(s):

Yunnan Province ◽

Stage 4 ◽

Guanshan Biota ◽

Lateral Posterior

Abstract We describe an extraordinarily preserved non-trilobite artiopod Bailongia longicaudata gen. et sp. nov. from the Cambrian Stage 4 Guanshan Biota in Yiliang, Kunming of the Yunnan Province in China. Its exoskeleton consists of a large semi-elliptical cephalon with paired lateral posterior eyes, nine tapering homonomous tergites and a long slender tailspine. Appendages include paired small antennae, at least three pairs of post-antennal cephalic limbs, and trunk biramous limbs consisting of an endopod and an exopod with lamellae. B. longicaudata does not conform to any taxon within Artiopoda, although the eyes invite comparisons with Xandarella spectaculum, Sinoburius lunaris and Phytophilaspis. Parsimony analyses indicate Bailongia is a member of Artiopoda and cannot be readily accommodated within any of the major artiopod clades.

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

Journal of Paleontology ◽

10.1017/jpa.2020.66 ◽

2020 ◽

Vol 95 (1) ◽

pp. 40-55 ◽

Cited By ~ 1

Author(s):

Xiaolin Duan ◽

Yue Liang ◽

Lars E. Holmer ◽

Zhifei Zhang

Keyword(s):

South China ◽

Lower Cambrian ◽

Yunnan Province ◽

First Record ◽

Soft Substrate ◽

Median Septum ◽

Stage 4 ◽

Shell Beds ◽

Guanshan Biota ◽

A New Species

AbstractBrachiopod 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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A crown group priapulid from the early Cambrian Guanshan Lagerstätte

Geological Magazine ◽

10.1017/s001675681700019x ◽

2017 ◽

Vol 154 (6) ◽

pp. 1329-1333 ◽

Cited By ~ 3

Author(s):

SHI-XUE HU ◽

MAO-YAN ZHU ◽

FANG-CHEN ZHAO ◽

MICHAEL STEINER

Keyword(s):

Yunnan Province ◽

The Body ◽

Early Cambrian ◽

Caudal Appendage ◽

Crown Group ◽

Stage 4 ◽

Mazon Creek ◽

Chengjiang Lagerstätte ◽

Moscovian Stage ◽

New Discovery

AbstractA well-preserved fossil priapulid worm, Xiaoheiqingella sp., is reported from the early Cambrian Guanshan Lagerstätte (Cambrian Series II, Stage 4) near Kunming City, Yunnan Province, SW China. The body of the animal consists of four sections: a swollen introvert, a constricted neck, a finely annulated trunk and a caudal appendage. The body configuration exhibits a close resemblance to that of the crown group priapulid Xiaoheiqingella peculiaris from the early Cambrian Chengjiang Lagerstätte. The new discovery provides another striking example of crown group priapulids, representing the third occurrence of crown group fossil priapulids after the Chengjiang Lagerstätte (Cambrian Series II, Stage 3) and the Mazon Creek Lagerstätte (late Moscovian Stage, Pennsylvanian). The discovery also sheds new light on the early diversity and evolution of priapulid worms.

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New observations on Vetulicola longbaoshanensis from the Lower Cambrian Guanshan Biota (Series 2, Stage 4), South China

Science China Earth Sciences ◽

10.1007/s11430-017-9088-y ◽

2017 ◽

Vol 60 (10) ◽

pp. 1795-1804 ◽

Cited By ~ 4

Author(s):

JinShu Li ◽

JianNi Liu ◽

Qiang Ou

Keyword(s):

South China ◽

Lower Cambrian ◽

Stage 4 ◽

Guanshan Biota

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New multipodomerous appendages of stem-group euarthropods from the Cambrian (Stage 4) Guanshan Konservat-Lagerstätte

Royal Society Open Science ◽

10.1098/rsos.211134 ◽

2021 ◽

Vol 8 (11) ◽

Author(s):

De-guang Jiao ◽

Stephen Pates ◽

Rudy Lerosey-Aubril ◽

Javier Ortega-Hernández ◽

Jie Yang ◽

...

Keyword(s):

South China ◽

First Record ◽

Phylogenetic Position ◽

Ecological History ◽

Stem Group ◽

Stage 4 ◽

The Family ◽

Guanshan Biota ◽

History Of ◽

Element Bearing

Stem-group euarthropods are important for understanding the early evolutionary and ecological history of the most species-rich animal phylum on Earth. Of particular interest are fossil taxa that occupy a phylogenetic position immediately crownwards of radiodonts, for this part of the euarthropod tree is associated with the appearance of several morphological features that characterize extant members of the group. Here, we report two new euarthropods from the Cambrian Stage 4 Guanshan Biota of South China. The fuxianhuiid Alacaris ? sp. is represented by isolated appendages composed of a gnathobasic protopodite and an endite-bearing endopod of at least 20 podomeres. This material represents the youngest occurrence of the family Chengjiangocarididae, and its first record outside the Chengjiang and Xiaoshiba biotas. We also describe Lihuacaris ferox gen. et sp. nov. based on well-preserved and robust isolated appendages. Lihuacaris ferox exhibits an atypical combination of characters including an enlarged rectangular base, 11 endite-bearing podomeres and a hypertrophied distal element bearing 8–10 curved spines. Alacaris ? sp. appendages display adaptations for macrophagy. Lihuacaris ferox appendages resemble the frontal appendages of radiodonts, as well as the post-oral endopods of chengjiangocaridid fuxianhuids and other deuteropods with well-documented raptorial/predatory habits. Lihuacaris ferox contributes towards the record of endemic biodiversity in the Guanshan Biota.

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