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The multituberculate Catopsalis from the early Paleocene of the Crazy Mountains Basin in Montana

100%

Buckley G. A.

Acta Palaeontologica Polonica

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1995

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tom 40

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nr 4

389-398

A new species of the taeniolabidid multituberculate Catopsalis is described from the Simpson Quarry fauna of the Puercan age Bear Formation of the Crazy Mountains Basin, south-central Montana. The molars retain a conservative cusp formula, yet are distinct from those of other early members of the genus in their extremely large size, which is approximately the same as that of C. calgariensis from the late Torrejonian to early Tiffanian. The combination of apomorphic and plesiomorphic features in the new species indicates a greater degree of complexity in the evolution of the genus than previously recognized.

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New multituberculate-like teeth from the Middle Jurassic of England

80%

Kermack K. A., Kermack D. M., Lees P. M., Mills J. R. E.

Acta Palaeontologica Polonica

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1998

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tom 43

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nr 4

581-606

New fossil mammal teeth are described from the Middle Jurassic (Bathonian) Forest Marble of Kirtlington, Oxfordshire, England. They are referred to a new genus and species, Eleutherodon oxfordensis, family Eleutherodontidae nov., suborder Eleutherodontida nov., order incertae sedis, assigned to Allotheria Marsh, 1880. These teeth are unique, but share with multituberculates and haramiyids the longitudinal arrangement of their cusps and with the former at least the propalinal action of the jaws in chewing, and palinal movement of the dentary during the power stroke. They differ in that respect from the Greenlandic Late Triassic Haramiyavia clemmenseni in which an orthal movement is predominant.

3

The braincase of two Late Cretaceous Asian multituberculates studied by serial sections

80%

Hurum J. H.

Acta Palaeontologica Polonica

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1998

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tom 43

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nr 1

21-52

The braincase structure of two Late Cretaceous Mongolian djadochtatherian multituberculates Nemegtbaatar gobiensis and Chulsanbaatar vulgaris from the ?late Campanian of Mongolia is presented based on the two serially sectioned skulls and additional specimens. Reconstructions of the floor of the braincase in both taxa are given. The complete intracranial sphenoid region is reconstructed for the first time in multituberculates. Cavum epiptericum is a separate space with the taenia clino-orbitalis (ossified pila antotica) as the medial wall, anterior lamina of the petrosal and possibly the alisphenoid as the lateral wall, and the basisphenoid, petrosal and possibly alisphenoid ventrally. The fovea hypochiasmatica is shallow, tuberculurn sellae is wide and more raised from the skull base than it is in the genus Pseudobolodon. The dorsal opening of the carotid canal is situated in the fossa hypophyseos. The taenia clino-orbitalis differs from the one described in Pseudobolodon and Lambdopsalis in possessing just one foramen (metoptic foramen). Compared to all extant mammals the braincase in Nemegtbaatar and Chulsanbaatar is primitive in that both the pila antotica and pila metoptica are retained. In both genera the anterior lamina of the petrosal is large with a long anterodorsal process while the alisphenoid is small. A review is given of the cranial anatomy in Nemegtbaatar and Chulsanbaatar.

Ograniczanie wyników

3 Acta Palaeontologica Polonica

1 Buckley G. A.

1 Hurum J. H.

1 Kermack D. M.

1 Kermack K. A.

1 Lees P. M.

1 Mills J. R. E.

2 1998

1 1995

The multituberculate Catopsalis from the early Paleocene of the Crazy Mountains Basin in Montana

New multituberculate-like teeth from the Middle Jurassic of England

The braincase of two Late Cretaceous Asian multituberculates studied by serial sections