BRACHIOPODS FROM THE BYRD GROUP (CAMBRIAN SERIES 2, STAGE 4) CENTRAL TRANSANTARCTIC MOUNTAINS, EAST ANTARCTICA: BIOSTRATIGRAPHY, PHYLOGENY AND SYSTEMATICS

Brachiopods from Cambrian Series 2, Stage 4 carbonate strata of the Byrd Group in the Central Transantarctic Mountains, East Antarctica, are described for the first time. These include six lingulate, one paterinate, and one rhynchonelliform taxa, including the new lingulate brachiopod Plicarmus wild...

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Bibliographic Details
Published in:Papers in Palaeontology
Main Authors: Claybourn, Thomas M., Skovsted, Christian, Holmer, Lars, E., Bing, Pan, Myrow, Paul M., Topper, Timothy, P., Brock, Glenn, A.
Format: Article in Journal/Newspaper
Language:English
Published: Enheten för paleobiologi 2020
Subjects:
brachiopods
East Antarctica
Cambrian Series 2
Biostratigraphy
Palaeobiogeography
cladistics
Natural Sciences
Naturvetenskap
Transantarctic Mountains
Byrd
Antarc*
Antarctica
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-3873
https://doi.org/10.1002/spp2.1295
Description
Summary:Brachiopods from Cambrian Series 2, Stage 4 carbonate strata of the Byrd Group in the Central Transantarctic Mountains, East Antarctica, are described for the first time. These include six lingulate, one paterinate, and one rhynchonelliform taxa, including the new lingulate brachiopod Plicarmus wildi gen. et sp. nov. The biostratigraphy correlates closely to the brachiopods recently reported from the Xinji Formation (Shuiyu section) in North China, as well as brachiopods recovered from the Dailyatia odyssei Zone across the Arrowie Basin of South Australia. These findings also support the previously identified close palaeobiogeography of these regions. The first unambiguous example of the acrotretid brachiopod Eohadrotreta zhenbaensis Li and Holmer outside South China is also identified in the context of its ontogenetic stages. Well preserved specimens of the acrotheloid Schizopholis yorkensis (Holmer and Ushatinskaya in Gravestock et al.) facilitates a new reconstruction of its musculature and visceral region. This data is synthesised into a new cladistic analysis that resolves Acrotheloidea as a well-supported monophyletic clade and supports previous hypotheses of a morphocline in acrotheloid evolution.

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