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Devonian rhizodontids and tristichopterids (Sarcopterygii; Tetrapodomorpha) from East Gondwana
Abstract
Devonian rhizodontid fishes from East Gondwana include Gooloogongia loomesi Johanson & Ahlberg 1998 from near Canowindra, New South Wales (NSW), Australia and Aztecia mahalae gen. nov., sp. nov. from southern Victoria Land, Antarctica. Gooloogongia loomesi is known from well-preserved cranial and postcranial material, and as such represents the most complete rhizodont known. Newly discovered elements (braincase, pelvic girdle) are described for the first time. Aztecia mahalae gen. nov., sp. nov. is based on shoulder girdle material formerly assigned to Notorhizodon Young et al. 1992, which, based on skull and lower jaw morphology, is a member of the Tristichopteridae. The presence of several plesiomorphic characters suggests that Gooloogongia occupies a basal phylogenetic position within the Rhizodontida, while Aztecia n. gen. possesses a more derived shoulder girdle. We argue that the Rhizodontida evolved on the Gondwanan landmass. Notorhizodon occupies a relatively derived position within the Tristichopteridae, but is contemporary with the earliest and phylogenetically most basal Laurussian members of the group. This shows that the tristichopterids achieved a worldwide distribution considerably earlier than previously thought.
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Fossils from transitional species such as Tiktaalik, Acanthostega, and Ichthyostega have helped identify key morphological and anatomical structures crucial to vertebrate terrestrial adaptation.
“Many fossils from important transitional species, such as Tiktaalik, Acanthostega, and Ichthyostega, have helped to identify key morphological and anatomical structures crucial to vertebrate terrestrial adaptation (Coates, 1996; Johanson & Ahlberg, 2001; Shubin et al., 2006).”
From Ancestral developmental potentials in early bony fish contributed to vertebrate water-to-land transition (2021) · cites this paper as Johanson & Ahlberg, 2001
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Fin ray patterns at the fin-to-limb transition
Stewart, T. A., Lemberg, J. B., Taft, N. K., Yoo, I., Daeschler, E. B., & Shubin, N. H. (2020) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1915983117 · Cited by 40
“For example, rhizodontids have a long unsegmented proximal region that spans most of the ray’s length (29, 30), and rays of the osteolepid Gogonasus andrewsae have distinctive perforations and cross-sectional geometry (31).”
Bi, X.-P., 深圳518083，中国, 深., BGI-Shenzhen, S., Zhang, G.-J., 650223，中国, 中. 昆., 650223，中国, 中. 昆., Villum Center for Biodiversity Genomics, S. F. E. A. E., Center for Excellence in Animal Evolution and Genetics, C. A. O. S., State Key Laboratory of Genetic Resources and Evolution, K. I. O. Z., & Villum Center for Biodiversity Genomics, S. F. E. A. E. (2021) · Zoological Research · doi:10.24272/j.issn.2095-8137.2021.066 · Cited by 15
Metadata
- Authors
- Johanson, Z., & Ahlberg, P. E.
- Affiliations
- Australian Museum (AU)
- Natural History Museum (GB)
- Venue
- Transactions of the Royal Society of Edinburgh: Earth Sciences
- Publisher
- Cambridge University Press (CUP)
- Published
- 2001-03
- Volume
- 92
- Issue
- 1
- Pages
- 43-74
- ISSN
- 0263-5933 (ISSN-L)
- 1473-7116
- OpenAlex
- W2132874804
- Cited by
- 75
- References
- 0
- Citations by year
- 2026: 3 · 2025: 3 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 4 · 2019: 4 · 2018: 7 · 2017: 2 · 2016: 2 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 3
- FWCI
- 1.86
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Earth and Environmental Science Transactions of the Royal Society of Edinburgh (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- Devonian fishes, East Gondwana, shoulder girdle, neurocranium, phylogenetic position, Laurussia, new genus and species, vertebrate paleontology
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