Results 41 to 50 of about 77,436 (299)

Morphological variation in atlas and axis of Neotropical spiny rats (Rodentia, Echimyidae)

The Anatomical Record, EarlyView.
Abstract The unique morphologies of the first two cervical vertebrae, the atlas and axis, represent a significant innovation in mammalian evolution. These structures support the weight of the head and enable intricate movements of the head and neck.
Thomas Furtado da Silva Netto, João Felipe Leal Kaiuca, Adriana Itatí Olivares, William Corrêa Tavares   +3 more
wiley   +1 more source

A new Middle Miocene selachian assemblage (Chondrichthyes, Elasmobranchii) from the Central Paratethys (Nyirád, Hungary): implications for temporal turnover and biogeography

Geologica Carpathica, 2016
A new Middle Miocene (Langhian - early Serravallian) assemblage with shark and ray teeth from Nyirád (Hungary, Transdanubia, Veszprém County) consists of nine families, with 15 different species. The assemblage shares many common genera with other Middle
Szabó Márton, Kocsis László
doaj   +1 more source

Geology of the Tehachapi Mountains, California [PDF]

, 1954
The San Joaquin-Sacramento Valley, also known as the Great Valley of California, separates the Coast Ranges on the west from the Sierra Nevada on the east. The southern part of this major physiographic and structural province is about 50 miles in average
Buwalda, John P.
core  

The cranial, mandibular, and hyoid anatomy of softshell turtles (Trionychidae): A revised character list for phylogenetic analysis

The Anatomical Record, EarlyView.
Abstract Softshell turtles (Pan‐Trionychidae) are an early branching clade of hidden‐necked turtles (Cryptodira) with a rich fossil record extending back to the Early Cretaceous. The evolutionary history of softshell turtles is still unresolved because of their conservative morphology combined with high levels of polymorphism related to morphological ...
Léa C. Girard, Walter G. Joyce
wiley   +1 more source

Nelumbo protospeciosa Saporta 1891 from the Berane Basin (Lower Miocene) [PDF]

Geološki Anali Balkanskoga Poluostrva, 2018
Berane Basin in Montenegro has been known for rich paleoflora of diverse geological ages. The remains of paleovegetation of various ages were preserved by the lake occurring in this area from Late Oligocene to Early Pliocene.
Đorđević-Milutinović Desa, Stevanović Branka, Ćulafić Goran   +2 more
doaj   +1 more source

Patterns of spinal motion, kinematic spaces and the land‐to‐sea transition in carnivorans

The Anatomical Record, EarlyView.
Using 3D reconstructions, we quantify intervertebral joint mobility to investigate how cervical, thoracic, and lumbar vertebral regions evolved distinct kinematic roles in pinnipeds. The findings reveal lineage‐specific adaptations for swimming and highlight the functional significance of vertebral joint flexibility in ecological transitions.
Juan Miguel Esteban, Alberto Martín‐Serra, Alejandro Pérez‐Ramos, Borja Figueirido   +3 more
wiley   +1 more source

Insights into the Middle–Late Miocene palaeoceanographic development of Cyprus (eastern Mediterranean) from a new δ¹⁸O and δ¹³C stable isotope composite record [PDF]

Climate of the Past
The Middle to Late Miocene was a time of significant global climate change. In the eastern Mediterranean region, these climatic changes coincided with important tectonic events, which resulted in changes to the organisation of oceanic gateways, altering ...
T. Cannings, T. Cannings, A. H. F. Robertson, D. Kroon   +3 more
doaj   +1 more source

MicroCT reinvestigation of the only articulated fossil anostomid fish reveals synonymy of Arhinolemur Ameghino, 1898 and Megaleporinus Ramirez et al., 2017

The Anatomical Record, EarlyView.
Abstract Arhinolemur scalabrinii† Ameghino, 1898 was originally described as a strepsirrhine primate (Mammalia) but has been recognized as an anostomid fish since 2012. It remains the only extinct anostomid species known from complete cranial material.
Karen M. Panzeri, Humberto L. Andrelino, Sergio Bogan, José P. O'Gorman, Federico Agnolín, Brian L. Sidlauskas, Nahuel Vega, Agustín G. Martinelli, José L. Birindelli   +8 more
wiley   +1 more source

Tertiary conglomerates of the North border of Sierra de Cameros

Cuadernos de Investigación Geográfica, 2013
The present paper is a study of the age of the siliceous conglomerates not consolidates situated in the Northern Sierra de Cameros. The age of these rocks are: Upper Oligocene (Chattian or older) the oldest; middle Miocene (Vindobonian) the intermediate;
Félix Pérez Lorente, Sara Pavía Santamaría, Carlos Pereda Olasolo   +2 more
doaj   +1 more source

Marine-Nonmarine Relationships in the Cenozoic Section of California [PDF]

, 1954
Highly fossiliferous marine sediments of Cenozoic age are widely distributed in the coastal parts of central and southern California, as well as in the Sacramento-San Joaquin Valley region farther inland.
Durham, J. Wyatt, Jahns, Richard H., Savage, Donald E.   +2 more
core