A new obolellid brachiopod from the Wirrealpa Limestone (Cambrian; Stage 4), Flinders Ranges, South Australia

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Palaeoworld Pub Date : 2024-12-04 DOI:10.1016/j.palwor.2024.11.005

Glenn A. Brock , Zhi-Liang Zhang , Lars E. Holmer

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引用次数: 0

Abstract

Obolellids are a monophyletic group of calcareous brachiopods with a worldwide distribution that often occur near the Series 2 (Stage 4)–Miaolingian Series (Wuliuan Stage) boundary. The poorly known taxon, Obolella wirrialpensis Etheridge, 1905 originally described from the lower Cambrian Wirrealpa Limestone in the Flinders Ranges has several unique character traits including prominent “stepped” concentric lamellae and, unusually for the family, lacks any type of radial ornament. The ventral valve has a well-defined acuminate beak and single asymmetrical tooth on the left side of a raised, orthocline ventral interarea platform that aligns with a wide median notch in the dorsal valve. This unique suite of character traits reveals the taxon to be a new endemic obolellid genus, here revised as Jagoellus n. gen., part of the late Stage 4 Chalasiocranos-Kaimenella shelly fossil zone and lower Kostjubella djagoran brachiopod assemblage zone from Australia.

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来源期刊

Palaeoworld PALEONTOLOGY-

CiteScore

4.00

自引率

5.90%

发文量

期刊介绍： Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata