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Rhizodont crossopterygian fish from the Dinantian of Foulden, Berwickshire, Scotland, with a re-evaluation of this group
Abstract
Material of crossopterygian fishes from Foulden, Berwickshire, is important in including the first known entire specimen giving a clear picture of the body form of the Family Rhizodontidae (sensu Andrews 1973). This group is specialised in having numerous subsidiary lateral lines on the body, a ventrally expanded shoulder girdle, fins with peculiar stiffened structure, the pectorals forming greatly enlarged paddles and other fins being reduced in size. The Foulden remains fall into large and small size-ranges occurring largely at different levels in the sequence, but although these may represent growth in one taxon the available parts of the body are mostly complementary. Separate preliminary descriptions of the two size-ranges are therefore given, the small complete form being named?Strepsodus anculonamensis sp. nov., and the large form remaining unnamed pending further study. An abridged historical account of previously named rhizodont genera (Rhizodus, Strepsodus, Sauripterus and Pycnoctenion) is given in order to explain why the new Foulden form(s) cannot at present be generically assigned more closely. A revised diagnosis of the Family Rhizodontidae leads to a discussion of the functional morphology and mode of life of fish of this type. Analogies with modern forms indicate that, like some sharks and crocodiles, they may have fed by tearing flesh off large prey, rotating or shaking against its inertia. Ways in which variously shaped rhizodont teeth (recurved, sigmoid etc.) may have functioned are suggested. Addenda deal with (1) the possible occurrence at Foulden of a large lungfish and (2) (after considering primitive and advanced rhizodont features) the renaming of Rhizodus ornatus Traquair 1878 from higher in the Scottish lower Carboniferous, as the type of a new genus,Screbinodus.
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At their distal tips, rays were likely branching, similar to other rhizodontids.
“At their distal tips, rays can be segmented (33) and were likely branching, similar to other rhizodontids (29).”
From Fin ray patterns at the fin-to-limb transition (2020) · cites this paper as [29]
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Cited by
Sorted by citations
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).”
Metadata
- Authors
- Andrews, S. M.
- Corresponding author
- Andrews, S. M.
- Venue
- Transactions of the Royal Society of Edinburgh: Earth Sciences
- Publisher
- Cambridge University Press (CUP)
- Published
- 1985
- Volume
- 76
- Issue
- 1
- Pages
- 67-95
- ISSN
- 0263-5933 (ISSN-L)
- 1473-7116
- OpenAlex
- W2110539808
- Cited by
- 79
- References
- 0
- Citations by year
- 2025: 2 · 2024: 2 · 2023: 3 · 2022: 1 · 2020: 1 · 2019: 3 · 2018: 4 · 2017: 1 · 2016: 2 · 2015: 2 · 2014: 1 · 2012: 2
- FWCI
- 4.89
- 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
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Keywords
- Dinantian, Carboniferous fishes, new species, family diagnosis, functional morphology, feeding behaviour, dental morphology, lungfish
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