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The Early Permian dvinosaur temnospondyl Acroplous vorax Hotton, 1959 is redescribed based on new specimens from the Eskridge Formation of Nebraska, and an unpublished specimen collected from the Speiser Shale of Kansas in 1960, along with reanalysis of previously described Acroplous specimens. The Nebraska Acroplous specimens are part of the oldest Permian (Asselian) nonmarine vertebrate faunal assemblage in the ... Read more »
Viewings: 1893 | Data: 02.07.2008 | Rating: 0.0/0 | Comments (0)

An opalized unionoid bivalve bearing potential vertebrate bite marks is described from Lower Cretaceous nonmarine deposits of Lightning Ridge, New South Wales, Australia. Damage to the shell includes a series of regularly spaced indentations with associated depression fracturing and some surface crushing. These injuries are consistent with vertebrate feeding traces reported on other fossil molluscs (cephalopods) a ... Read more »
Viewings: 1651 | Data: 02.07.2008 | Rating: 0.0/0 | Comments (0)

Malarguesaurus florenciae gen. et sp. nov. is a new and robust somphospondylian titanosauriform (Dinosauria, Sauropoda) from the Neuquén basin, Mendoza Province, Argentina. The specimen comes from Upper Cretaceous strata assigned to the Portezuelo Formation (upper Turonian-lower Coniacian). It includes proximal, middle and distal caudal vertebrae, chevrons, dorsal ribs, and appendicular bones. Malarguesaurus is ch ... Read more »
Viewings: 1709 | Data: 02.07.2008 | Rating: 0.0/0 | Comments (0)

The gap in our understanding of the evolutionary transition from fish to tetrapod is beginning to close thanks to the discovery of new intermediate forms such as Tiktaalik roseae. Here we narrowit further by presenting the skull, exceptionally preserved braincase, shoulder girdle and partial pelvis of Ventastega curonica from the Late Devonian of Latvia, a transitional intermediate form between the ‘elpistostegids’ Panderichthys and Tiktaalik and the Devonian tetrapods (limbed vertebrates) Acanthostega and Ichthyostega. Ventastega is the most primitive Devonian tetrapod represented by extensive remains, and casts light on a part of the phylogeny otherwise only represented by fragmentary taxa ... Read more »
Viewings: 2247 | Data: 01.07.2008 | Rating: 4.0/1 | Comments (1)

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