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Acanthostega

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Figure  1 —The transition between osteolepiform fish and primitive amphibia...
Published: 01 November 2001
Figure 1 —The transition between osteolepiform fish and primitive amphibians represented by Eusthenopteron and Panderichthys from the Frasnian and Acanthostega from the Famennian (Upper Devonian), a period of approximately 15 m.y. Eusthenopteron and Panderichthys from Carroll (1997
Journal Article
Journal: Geology
Published: 01 July 1999
Geology (1999) 27 (7): 637–640.
... succession that has yielded Acanthostega and Ichthyostega , two tetrapods that are regarded as critically important taxa for our understanding of the origin and early evolution of the tetrapods. These palynological assemblages conclusively show that the rocks are Devonian in age. The evidence resolves a 60...
Journal Article
Published: 29 April 2003
Canadian Journal of Earth Sciences (2003) 40 (4): 483–498.
... as in other early tetrapods, but it is difficult to envisage a structural role for this element as suggested by recent hypotheses. The basi- and exoccipitals co-ossified as in some specimens of Greererpeton and Acanthostega , but unlike the latter, the condyle is almost fully ossified. The exoccipitals do...
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Journal Article
Published: 01 September 2000
Journal of Paleontology (2000) 74 (5): 938–956.
... on the occiput and closely associated elements of the skull roof. A lack of adequate anatomical data has forced the elimination of only a few relevant higher-level taxa from consideration, and, using Acanthostega as the reference outgroup, a cladistic analysis of the interrelationships of the Lepospondyli...
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Journal Article
Journal: PALAIOS
Published: 01 October 2002
PALAIOS (2002) 17 (5): 529.
... of over 50 “anatomically correct” skeletal mazes of creatures ranging from Acanthostega to Archaeopteryx . Aimed at ages 5 and up, this book is a wonderful and challenging addition to any budding paleontologist's library. This poster-sized, soft back book (pages are 18” x 13 1/2”) is rolled...
Journal Article
Published: 01 March 2000
Journal of Paleontology (2000) 74 (2): 301–308.
... such as detailed studies of the Late Devonian forms Acanthostega gunnari ( Clack, 1994 , 1998 ; Coates, 1996 ; Ahlberg and Clack, 1998 ) and Ichthyostega stensioei ( Jarvik, 1996 ). These comprehensive studies of the most completely known early tetrapod taxa provide functional interpretations of postcranial...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP339.9
EISBN: 9781862395879
... both Ichthyostega and Acanthostega ) is reinterpreted. The Britta Dal Formation channels have flat bases, are poorly channelized, are of low sinuosity and are part of a very major distributory system that periodically experienced extreme flooding. The tetrapod fossils were recovered from...
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Journal Article
Published: 13 October 2020
Canadian Journal of Earth Sciences (2020) 57 (11): 1365–1369.
... kicking swimmer as opposed to a more primitive animal that primarily used tail-based propulsion in an aquatic environment. NSM.005.GF.045.112 may have had a hindlimb orientation somewhere between Crassigyrinus scoticus and earlier Devonian tetrapods such as Acanthostega or Tulerpeton . The fibulae...
FIGURES
Journal Article
Published: 01 September 2021
Journal of Paleontology (2021) 95 (5): 1048–1060.
... of Ichthyerpeton bradleyae compared with other early tetrapods. Information obtained for the other tetrapods from the following: Acanthostega (Coates, 1996 ; Pierce et al ., 2013 ); Crassigyrinus (Panchen, 1985 ; Panchen and Smithson, 1990 ; Clack and Finnay, 2005 ; Herbst and Hutchinson, 2019...
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Journal Article
Published: 01 November 2001
Journal of Paleontology (2001) 75 (6): 1202–1213.
...Figure 1 —The transition between osteolepiform fish and primitive amphibians represented by Eusthenopteron and Panderichthys from the Frasnian and Acanthostega from the Famennian (Upper Devonian), a period of approximately 15 m.y. Eusthenopteron and Panderichthys from Carroll (1997...
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Journal Article
Published: 01 April 1995
Journal of the Geological Society (1995) 152 (2): 407–413.
... material of the early tetrapod Acanthostega from the Upper Devonian of East Greenland Palaeontology 1988 31 699 724 Coates M.I. Clack J.A. Polydactyly in the earliest known tetrapod limbs Nature 1990 347 66 68 Coates M.I. Clack J.A. Fish-like gills and breathing...
Image
List of axial, appendicular, and scalation characters of  Ichthyerpeton bra...
Published: 01 September 2021
Table 1. List of axial, appendicular, and scalation characters of Ichthyerpeton bradleyae compared with other early tetrapods. Information obtained for the other tetrapods from the following: Acanthostega (Coates, 1996 ; Pierce et al ., 2013 ); Crassigyrinus (Panchen, 1985 ; Panchen
Image
( a ) Cladogram of early tetrapods showing distribution of paroccipital pro...
Published: 29 April 2003
reconstructions of six early tetrapods: Acanthostega , a primitive Devonian tetrapod; Whatcheeria – Pederpes (based on GLAHMS 100815, FMPR1801, and Lombard and Bolt 1995 ); Pholiderpeton , a Westphalian embolomere (from Clack 1987 ); Greererpeton , a colosteid (based on KU 87695 and Smithson 1982
Journal Article
Published: 01 November 2010
Journal of Paleontology (2010) 84 (6): 1135–1151.
... tetrapods internasals are present in Acanthostega ( Clack, 1994 ), Ichthyostega ( Jarvik, 1996 ), and baphetids ( Beaumont, 1977 ). A (fused) single midline internasal appears to be derived and is otherwise found only in Ichthyostega ( Jarvik, 1996 ). Presence of an interfrontonasal (paired...
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Journal Article
Published: 18 November 2005
Canadian Journal of Earth Sciences (2005) 42 (8): 1481–1499.
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Journal Article
Published: 01 September 2007
Journal of Paleontology (2007) 81 (5): 873–894.
...) such as Acanthostega gunnari Jarvik, 1952 ( Coates and Clack, 1990 , 1991 ; Coates, 1996 ) and secondarily aquatic temnospondyls ( Watson, 1919 ), including T. insignis . The skull of T. insignis was first described by Cope (1878) , and further descriptions were undertaken by Cope (1884) , Case (1911...
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Series: Geological Society, London, Special Publications
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.180.01.29
EISBN: 9781862394285
...-Söderbergh 1932 a ) and it has found its way into popular literature as well as textbooks and scientific journals as the ‘four-legged fish’ (Jarvik 1952 , 1980 , 1996 ). In 1952 it was joined by a second genus, Acanthostega (Jarvik 1952 ). The history of the expeditions to collect these vertebrates...
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Journal Article
Published: 01 January 2007
Journal of Paleontology (2007) 81 (1): 143–153.
... of lepidotrichia in the caudal fin, reduction of the internal gills (gill arches generally cartilaginous and not grooved for afferent branchial artery, contrary to Acanthostega Jarvik, 1952 and Ichthyostega Säve-Söderbergh, 1932 ) The new microanatomical data on the endoskeletal fin bones...
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Figure  3 —Outline sketches of skulls of late Paleozoic tetrapods in  1, 3 ...
Published: 01 September 2000
Figure 3 —Outline sketches of skulls of late Paleozoic tetrapods in 1, 3 – 9, 11, 13 – 17, occipital and 2, 10, 12, right lateral cheek region views. 1, 2, Acanthostega gunnari (from Clack, 1998 ); 3, Asaphestera intermedia (Microsauria) (from Carroll and Gaskill, 1978 ); 4
Journal Article
Published: 11 March 2010
Canadian Journal of Earth Sciences (2010) 47 (3): 209–219.
.... Although this may represent the neural or haemal spine of the terminal vertebra, both its horizontal orientation and greater length compared with adjacent spines suggest that it may represent a urostyle. This structure has been reported in the archaic tetrapods Ichthyostega ( Jarvik 1996 ) and Acanthostega...
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