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

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 (Metabologr...

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Published inJournal of paleontology Vol. 94; no. 5; pp. 955 - 965
Main Authors Muir, Lucy A, Zhang, Yuandong, Botting, Joseph P, Ma, Xuan
Format Journal Article
LanguageEnglish
Published New York, USA The Paleontological Society 01.09.2020
Cambridge University Press
Paleontological Society
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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.
AbstractList 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.
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 th1 1 and th1 2 , thecal elongation, and greater outward inclination of the thecal walls. UUID: http://zoobank.org/81c433a0-9069-48d2-ae72-1267400cbf77 .
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.
Author Ma, Xuan
Zhang, Yuandong
Muir, Lucy A
Botting, Joseph P
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  givenname: Xuan
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Snippet The latest Ordovician to earliest Silurian graptolite Avitograptus avitus is important in the biostratigraphy of the Ordovician–Silurian boundary interval. Two...
The latest Ordovician to earliest Silurian graptolite Avitograptus avitus is important in the biostratigraphy of the Ordovician-Silurian boundary interval. Two...
Abstract The latest Ordovician to earliest Silurian graptolite Avitograptus avitus is important in the biostratigraphy of the Ordovician–Silurian boundary...
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SubjectTerms Anji China
Asia
Avitograptus
biologic evolution
biometry
Biostratigraphy
Biota
China
Dimorphograptidae
Elongation
Far East
Fushi Reservoir
Graptolithina
Hemichordata
Hirnantian
invertebrate
lithostratigraphy
Monograptoidea
morphology
New combinations
new names
New species
new taxa
Ordovician
Paleontology
Paleozoic
Parakidograptus
Pterobranchia
REGULAR ARTICLES
Silurian
Small mammals
Stratigraphy
taxonomy
Upper Ordovician
Wenchang Formation
Zhejiang China
Title Avitograptus species (Graptolithina) from the Hirnantian (uppermost Ordovician) Anji Biota of South China and the evolution of Akidograptus and Parakidograptus
URI http://www.bioone.org/doi/abs/10.1017/jpa.2020.12
https://www.cambridge.org/core/product/identifier/S0022336020000128/type/journal_article
https://pubs.geoscienceworld.org/jpaleontol/article/94/5/955/590596/Avitograptus-species-Graptolithina-from-the
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