Affiliation:
1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
2. Shaanxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi’an 710069, China
Abstract
Radiodonta, an extinct stem-euarthropod group, has been considered as the largest predator of Cambrian marine ecosystems. As one of the radiodont-bearing Konservat-Lagerstätten, the Guanshan biota (South China, Cambrian Stage 4) has yielded a diverse assemblage of soft-bodied and biomineralized taxa that are exclusive to this exceptional deposit. “Anomalocaris” kunmingensis, the most abundant radiodont in the Guanshan biota, was originally assigned to Anomalocaris within the Anomalocarididae. Despite this taxon being formally assigned to the family Amplectobeluidae more recently, its generic assignment remains uncertain. Here, we present new materials of “Anomalocaris” kunmingensis from the Guanshan biota, and reveal that the frontal appendages possess two enlarged endites; all endites bear one posterior auxiliary spine and up to four anterior auxiliary spines; three robust dorsal spines and one terminal spine protrude from the distal part. These new observations, allied with anatomical features illustrated by previous studies, allow us to assign this taxon to a new genus, Guanshancaris gen. nov. Brachiopod shell bearing embayed injury and incomplete trilobites, associated with frontal appendages in our specimens, to some extent confirm Guanshancaris as a possible durophagous predator. The distribution of amplectobeluids demonstrates that this group is restricted to Cambrian Stage 3 to Drumian, and occurs across South China and Laurentia within the tropics/subtropics belt. Moreover, the amount and abundance of amplectobeluids evidently decreases after the Early–Middle Cambrian boundary, which indicates its possible preference for shallow water, referring to its paleoenvironmental distribution and may be influenced by geochemical, tectonic, and climatic variation.
Funder
Natural Science Foundation of China
Strategic Priority Research Program of the Chinese Academy of Sciences
111 Project
Natural Science Basic Research Plan of Shaanxi Province
China Postdoctoral Science Foundation
Subject
General Agricultural and Biological Sciences,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology
Reference80 articles.
1. Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah;Daley;J. Syst. Palaeontol.,2013
2. Making sense of ‘lower’ and ‘upper’ stem–group Euarthropoda, with comments on the strict use of the name Arthropoda von Siebold, 1848;Biol. Rev. Camb. Philos. Soc.,2016
3. The Largest Cambrian Animal, Anomalocaris, Burgess Shale, British Columbia;Whittington;Philos. Trans. R. Soc. B Biol. Sci.,1985
4. Evidence for Monophyly and Arthropod Affinity of Cambrian Giant Predators;Chen;Science,1994
5. The Emu Bay Shale, a Lower Cambrian fossil Lagerstätte, Kangaroo Island, South Australia;Nedin;Mem. Assoc. Australas. Palaeontol.,1995
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