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Avitograptus species (Graptolithina) from the Hirnantian (uppermost Ordovician) Anji Biota of South China and the evolution of Akidograptus and Parakidograptus

Published online by Cambridge University Press:  07 May 2020

Lucy A. Muir Open the ORCID record for Lucy A. Muir [Opens in a new window] ,
Yuandong Zhang ,
Joseph P. Botting  and
Xuan Ma
Lucy A. Muir
Affiliation:
Department of Natural Sciences, Amgueddfa Cymru – National Museum Wales, Cathays Park, CardiffCF10 3NP, UK
Yuandong Zhang*
Affiliation:
State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing210008, China University of Chinese Academy of Sciences, Beijing100049, China
Joseph P. Botting
Affiliation:
Department of Natural Sciences, Amgueddfa Cymru – National Museum Wales, Cathays Park, CardiffCF10 3NP, UK Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road, Nanjing210008, China
Xuan Ma
Affiliation:
University of Chinese Academy of Sciences, Beijing100049, China
*
*Corresponding author
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Abstract

The latest Ordovician to earliest Silurian graptolite Avitograptus avitus is important in the biostratigraphy of the Ordovician–Silurian boundary interval. Two additional species of Avitograptus are described from the sponge-dominated Anji Biota of the Upper Ordovician Wenchang Formation (Metabolograptus persculptus Biozone) of Zhejiang Province, South China. One species, Avitograptus akidomorphus new species, is new; the other, Avitograptus acanthocystus new combination, which was previously placed in Climacograptus, is herein assigned to Avitograptus. The former species may represent the ancestral akidograptid because it is identical in thecal form to Akidograptus, but differs in the development of the proximal end. The evolutionary changes from Avitograptus avitus to Akidograptus and Parakidograptus involved distal movement of the origins of th11 and th12, thecal elongation, and greater outward inclination of the thecal walls.

UUID: http://zoobank.org/81c433a0-9069-48d2-ae72-1267400cbf77.

Type
Articles
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Journal of Paleontology , Volume 94 , Issue 5 , September 2020 , pp. 955 - 965
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Copyright © 2020, The Paleontological Society

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