摘要:

The new genus and speciesAlainaspis platyrhinafrom the Silurian of Prince of Wales and Somerset Islands, Northwest Territories, Canada is a large cyathaspidid of the subfamily Poraspidinae with distinctive proportions of probable adaptive significance. It is most closely related toBoothiaspis, previously described as an amphiaspid, but here reassigned to the Poraspidinae. The distribution of this genus helps to provide local correlation between the lower member of the Peel Sound Formation and the Somerset Island Formation on Prince of Wales and Somerset Islands. Associated invertebrates and vertebrates indicate a late Ludlovian to Pridolian age for the fauna.

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011848

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

A new skeleton of the amphibious reptileChampsosaurusfrom the late Paleocene of western North Dakota reveals that the head and body were dorsoventrally flattened as an adaptation to a fully aquatic existence. The nearly intact and undistorted skull demonstrates that a well developed secondary palate was present. Long nasal passages and a flexible neck functioned in snorkeling. The essentially complete articulated postcranial skeleton indicates that the ribcage was relatively rigid. Gastralia functioned with this rigid unit in compression and expansion of the pleural cavity and lowered the center of gravity to assist in underwater stability. An integument of fine circular or rhomboid scales was present.

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011849

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Skull material of the prosauropod dinosaurMassospondylus, previously known only from Africa, has been found in the Kayenta Formation (Glen Canyon Group) of northeastern Arizona. A reconstruction of the skull, corrected for distortion, is compared with that ofPlateosaurus. The dentition provides evidence for an herbivorous diet in prosauropods; the presence of small palatal teeth is reported for the first time in any dinosaur. The associated fauna is related to faunas from the Elliot and Clarens sandstone formations in southern Africa, and an Early Jurassic (rather than Late Triassic) age is accepted for these formations as well as for the Kayenta Formation.

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011850

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

A new family of theropod dinosaurs is described based on metatarsi from North America and Argentina. Because birds are theropod descendants, there are often problems in assigning isolated metatarsi to the proper group. Differences between the metatarsi of ground birds and theropods are detailed. In particular, it is shown that the length/width ratio of articulated metatarsi cannot be used to distinguish higher taxa. This new family represents the first occurrence of the same genus of theropod dinosaur from both Laurasia and Gondwanaland at the end of the Cretaceous, a time when the two supercontinents were supposedly still separate.

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011851

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

All genera previously referred to the Manitshini are reviewed.IschyrotomusMatthew is synonymized withPseudotomusCope, and the tribe Manitshini is restricted to this latter genus and the ChadronianManitsha. Pseudotomusis represented by three Bridgerian species, four Uintan species, and one Duchesnean and Chadronian species.

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011852

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

New finds of brontotheres, raoellid artiodactyls and cetaceans are reported from the Middle Eocene Upper Subathu Group exposed in the Kalakot-Metka-Moghla inliers of Rajauri District, Jammu and Kashmir. The brontothere is closely allied toEotitanops dayifrom the Ganda Kas region of Pakistan and is much smaller thanPakotitanops. Raoellids are represented by four genera and five species includingMetkatius kashmiriensis, gen. et sp. nov. andKunmunella transversa, sp. nov. The Eocene artiodactyls of India do not resemble contemporary forms from contiguous regions and are probably endemic to the subcontinent. The systematics of previously described Indo-Pakistani genera have been revised and listed. Associated mammals include a jaw fragment of a protocetid whale,Ichthyolestes pinfoldi, which is also known from coeval beds in Pakistan.

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011853

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011854

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011855

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0272-4634    

DOI:10.1080/02724634.1985.10011856

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor