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Relevant bibliographies by topics / Lepospondyli

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Journal articles

Academic literature on the topic 'Lepospondyli'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Lepospondyli"

1

Berman, David S. "Origin and early evolution of the amniote occiput." Journal of Paleontology 74, no. 5 (2000): 938–56. http://dx.doi.org/10.1017/s0022336000033114.

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Reinterpretation of cranial materials of the diadectomorphs Limnoscelis and Diadectes has prompted a reconsideration of the origin and early evolution of the amniote occiput. The basic approach is a phylogenetic study of major groups of Paleozoic tetrapods based 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, Temnospondyli, Seymouriamorpha, Baphetidae (= Loxommatidae), Anthracosauria, Diadectomorpha, Synapsida, and Reptilia has produced the following results: 1) the ingroup taxa exhibit a basal dichotomy in which one division consists of the unresolved relationships of Lepospondyli, Temnospondyli, and Seymouriamorpha; 2) the pattern of relationships of the second division of the ingroup taxa is a series of nested clades, terminating with the Diadectomorpha and Synapsida as sister taxa sharing a more recent common ancestor than either does with Reptilia. This relationship requires assignment of Diadectomorpha to Amniota; and 3) the Anthracosauria and Baphetidae are progressively more distant clades or sister taxa. On the basis of the cladistic analysis, the attainment of the amniote occiput is described as passing through four morphological grades of organization. Each grade of the series is characterized by a set of derived character states that defines the progressively more-derived nodes and from which branch a clade containing the unresolved trichotomy of Lepospondyli, Temnospondyli, and Seymouriamorpha; the Baphetidae clade; the Anthracosauria clade; and the Diadectomorpha + Synapsida and Reptilia clades, respectively.

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2

Anderson, Jason S. "Revision of the aïstopod genus Phlegethontia (Tetrapoda: Lepospondyli)." Journal of Paleontology 76, no. 6 (2002): 1029–46. http://dx.doi.org/10.1017/s0022336000057851.

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The aïstopod family Phlegethontiidae is restudied based on new specimens from Pit 11 of Mazon Creek, Illinois, and the coal shales of Nýřany, Czech Republic, as well as most available specimens from North America. Phlegethontiids have highly fenestrate skulls, with orbits placed just anterior their skull's mid point. Dermal skull bones are greatly reduced in number and limited in extent, whereas the endochondral braincase is hyperossified. The frontals are fused medially and enclose the parietal foramen and anterior sagittal crest. As in most other aïstopods, the quadrate, pterygoid, and epipterygoid are fused into a composite bone, the palatoquadrate complex. Details of cranial anatomy contradict a previous model of cranial kinesis by severely limiting the skull's potential mobility. Remnants of the pectoral girdle are present, perhaps due to the presence of an operculum–opercularis-like connection to the stapes. No remnants of the pelvis are present.Three species are recognised within the family. Phlegethontia linearis has short anterior vertebrae, high neural spines on at least the anterior four vertebrae, and vertebrae number between 230–250 in total. Phlegethontia longissima has low neural spines throughout the column, anterior vertebrae that are twice as long as P. linearis, and only 200–210 total vertebrae. Sillerpeton permianum, known from a single braincase and an unassociated string of vertebrae, is distinguished from Phlegethontia by the retention of a separate foramen for the passage of the occulomotor nerve. Phlegethontia “phanerhalpa” is a tiny braincase fragment that differs from the other species of Phlegethontia only in the placement of the jugular foramen relative to the centre of the foramen magnum. This is probably a size-related feature, and P. “phanerhalpa” is considered a nomen dubium.

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3

ANDERSON, JASON S. "REVISION OF THE AÏSTOPOD GENUS PHLEGETHONTIA (TETRAPODA: LEPOSPONDYLI)." Journal of Paleontology 76, no. 6 (2002): 1029–46. http://dx.doi.org/10.1666/0022-3360(2002)076<1029:rotagp>2.0.co;2.

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4

Anderson, Jason S. "A new aïstopod (Tetrapoda: Lepospondyli) from Mazon Creek, Illinois." Journal of Vertebrate Paleontology 23, no. 1 (2003): 79–88. http://dx.doi.org/10.1671/0272-4634(2003)23[79:anatlf]2.0.co;2.

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5

Carroll, Robert L. "A juvenile adelogyrinid (Amphibia: Lepospondyli) from the Namurian of Scotland." Journal of Vertebrate Paleontology 9, no. 2 (1989): 191–95. http://dx.doi.org/10.1080/02724634.1989.10011752.

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6

Olori, Jennifer C. "Morphometric analysis of skeletal growth in the lepospondylsMicrobrachis pelikaniandHyloplesion longicostatum(Tetrapoda, Lepospondyli)." Journal of Vertebrate Paleontology 33, no. 6 (2013): 1300–1320. http://dx.doi.org/10.1080/02724634.2013.775141.

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7

Henrici, Amy C., Thomas Martens, David S. Berman, and Stuart S. Sumida. "An ostodolepid ‘microsaur’ (Lepospondyli) from the Lower Permian Tambach Formation of central Germany." Journal of Vertebrate Paleontology 31, no. 5 (2011): 997–1004. http://dx.doi.org/10.1080/02724634.2011.596601.

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8

Anderson, Jason S., and Robert R. Reisz. "A new microsaur (Tetrapoda: Lepospondyli) from the Lower Permian of Richards Spur (Fort Sill), Oklahoma." Canadian Journal of Earth Sciences 40, no. 4 (2003): 499–505. http://dx.doi.org/10.1139/e02-066.

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Bolterpeton carrolli n.gen. n.sp. is described from the Lower Permian fissure-fill deposits of Richards Spur, Oklahoma. Bolterpeton is united with the gymnarthrid microsaur Cardiocephalus by having teeth compressed labiolingually, a narrow anterior process of the prearticular penetrating the splenial, and the arrangement of the contacts among the splenial, prearticular, and coronoids. It is united with both Cardiocephalus and Euryodus by the size and distribution of the coronoid teeth and the presence of longitudinal striations of enamel on the lingual tooth surface. Unlike those two genera Bolterpeton has peg-like teeth, but it remains unknown whether this represents the primitive condition or a reversal of the massive conical teeth typical of gymnarthrids. Bolterpeton possesses a flat lamina that runs along the lingual surface of the tooth margin. Where two laminae meet at the point of the tooth a labiolingual ridge is formed, which is most pronounced at smaller sizes. Reexamination of Cardiocephalus shows it to have the same morphology on its "incisors." Previous authors have defined teeth bearing this ridge as "weakly bicuspid." If this ridge were homologous with the "strongly bicuspid" condition of lissamphibians, Bolterpeton would provide the first example of this tooth morphology in lepospondyls and would strengthen recent hypotheses suggesting lepospondyls gave rise to some, if not all, modern amphibians.

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9

Reisz, R. R., and S. P. Modesto. "Archerpeton anthracos from the Joggins Formation of Nova Scotia: a microsaur, not a reptile." Canadian Journal of Earth Sciences 33, no. 5 (1996): 703–9. http://dx.doi.org/10.1139/e96-053.

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New anatomical information, provided by reinterpretation of the pectoral girdle and exposure of previously unprepared portions of the holotype, reveals that the early tetrapod Archerpeton anthracos (Westphalian A of Joggins, Nova Scotia) is a microsaurian lepospondyl, rather than a reptile, as originally described. Archerpeton anthracos is similar to another Joggins microsaur, Asaphestera intermedia, from which it is distinguished by autapomorphies of the appendicular skeleton. The discovery that A. anthracos is a microsaur increases the number of lepospondyls at Joggins to six species and reduces the number of amniotes to two species, Hylonomus lyelli and Protoclepsydrops haplous.

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10

Szostakiwskyj, Matt, Jason D. Pardo, and Jason S. Anderson. "Micro-CT Study of Rhynchonkos stovalli (Lepospondyli, Recumbirostra), with Description of Two New Genera." PLOS ONE 10, no. 6 (2015): e0127307. http://dx.doi.org/10.1371/journal.pone.0127307.

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