New symmetrodonts (Mammalia, Theria) from the Purbeck Limestone Group, Lower Cretaceous, southern England

Ensom, P.C.; Sigogneau-Russell, D.

doi:10.1006/cres.2000.0227

Cited by 16 publications

(33 citation statements)

References 10 publications

(10 reference statements)

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“…Furthermore, the incomplete type is missing the parastylar region of the tooth. Eurylambda has been suggested to be a junior synonym of Tinodon (Prothero, 1981;Fox, 1985;McKenna and Bell, 1997;Sigogneau-Russell and Ensom, 1998;Ensom and Sigogneau-Russell, 2000) and we tentatively follow this interpretation here (see below), although for convenience we continue to use the name Eurylambda for the upper molars. TINODONTIDAE FOX, 1985 Tinodon bellus Marsh, 1879(Amphidon aequicrurius Simpson, 1925aEurylambda Simpson, 1929).…”

Section: Introductionmentioning

confidence: 76%

“…The importance of Eurylambda in our understanding of early ''symmetrodont'' relationships has recently been stressed by Ensom and Sigogneau-Russell (2000). Eurylambda, putatively a junior synonym of Tinodon, represents one of the few examples of upper tooth morphology among ''symmetrodonts'' and it has played a crucial role in the study of dental occlusion Jenkins, 1967, 1968;Crompton, 1971).…”

Section: Discussionmentioning

confidence: 99%

“…Eurylambda represents the archetype for basal nontribosphenic holotheres (Hopson, 1994;Wible et al, 1995). Ensom and Sigogneau-Russell (2000) recently described a new species of Tinodon, Tinodon micron, from the Purbeck Limestone Group, Lower Cretaceous of England. The type specimen is a lower molar that agrees quite closely with the American species of Tinodon.…”

Section: Discussionmentioning

confidence: 99%

“…The type specimen is a lower molar that agrees quite closely with the American species of Tinodon. In addition to lower molars, Ensom and Sigogneau-Russell (2000) attributed an isolated upper molar to the same species and compared it to Eurylambda. We concur with their analysis in noting the close similarities between the two North American specimens of Eurylambda and the English specimen, DORCM GS 694, referred to T. micron.…”

Section: Discussionmentioning

confidence: 99%

“…Discovery of a second specimen of Eurylambda is important because the type, a fragmentary maxilla with one tooth, has previously been the only model for the upper dentition of basal or obtuse angled ''symmetrodonts'' Jenkins, 1967, 1968;Crompton, 1971;Ensom and Sigogneau-Russell, 2000). Furthermore, the incomplete type is missing the parastylar region of the tooth.…”

Section: Introductionmentioning

confidence: 99%

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A New Specimen of Eurylambda aequicrurius and Considerations on “Symmetrodont” Dentition and Relationships

Rougier

Spurlin

Kik³

2003

American Museum Novitates

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A new specimen of the tinodontid ''symmetrodont'' Eurylambda (Simpson, 1925a, 1929) from the Late Jurassic Como Bluff Quarry, Morrison Formation, is described. The specimen, a complete upper left molariform, is probably an M1. The major crown cusps of Eurylambda show similarities to those of triconodontids on the one hand and to spalacotherioids on the other. Cusp B of basal mammaliaforms is tentatively proposed as homologous with the cusp traditionally described as a stylocone in Eurylambda and with cusp BЈ of Peralestes. These homologies imply that the stylocone is ancestrally a small cusp in the lineage leading to Theria and that the development of a parastylar lobe or ''hook'' is a derived feature of post-tinodontid mammals. If accepted, this scenario results in a more complex origin for the therian upper molar than previously recognized. Wear facet 1 (Crompton, 1971) of holotherians would not be homologous between Kuehneotherium-Eurylambda-Zhangheotherium, on the one hand, and the therians, on the other.

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Section: Introductionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A New Specimen of Eurylambda aequicrurius and Considerations on “Symmetrodont” Dentition and Relationships

Rougier

Spurlin

Kik³

2003

American Museum Novitates

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A new phylogeny for basal Trechnotheria and Cladotheria and affinities of South American endemic Late Cretaceous mammals

Averianov

Martin

Лопатин

2013

Naturwissenschaften

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The endemic South American mammals Meridiolestida, considered previously as dryolestoid cladotherians, are found to be non-cladotherian trechnotherians related to spalacotheriid symmetrodontans based on a parsimony analysis of 137 morphological characters among 44 taxa. Spalacotheriidae is the sister taxon to Meridiolestida, and the latter clade is derived from a primitive spalacolestine that migrated to South America from North America at the beginning of the Late Cretaceous. Meridiolestida survived until the early Paleocene (Peligrotherium) and early Miocene (Necrolestes) in South America, and their extinction is probably linked to the increasing competition with metatherian and eutherian tribosphenic mammals. The clade Meridiolestida plus Spalacotheriidae is the sister taxon to Cladotheria and forms a new clade Alethinotheria. Alethinotheria and its sister taxon Zhangheotheria, new clade (Zhangheotheriidae plus basal taxa), comprise Trechnotheria. Cladotheria is divided into Zatheria (plus stem taxa, including Amphitherium) and Dryolestida, including Dryolestidae and a paraphyletic array of basal dryolestidans (formerly classified as "Paurodontidae"). The South American Vincelestes and Groebertherium are basal dryolestidans.

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Postcranial Skeleton of the Cretaceous Mammal Akidolestes cifellii and Its Locomotor Adaptations

Meng

Luo

2012

J Mammal Evol

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New symmetrodonts (Mammalia, Theria) from the Purbeck Limestone Group, Lower Cretaceous, southern England

Cited by 16 publications

References 10 publications

A New Specimen of Eurylambda aequicrurius and Considerations on “Symmetrodont” Dentition and Relationships

A New Specimen of Eurylambda aequicrurius and Considerations on “Symmetrodont” Dentition and Relationships

A new phylogeny for basal Trechnotheria and Cladotheria and affinities of South American endemic Late Cretaceous mammals

Postcranial Skeleton of the Cretaceous Mammal Akidolestes cifellii and Its Locomotor Adaptations

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