Results 231 to 240 of about 1,898,413 (348)

Dental crown morphological variation and heterodonty in carcharhiniform sharks

The Anatomical Record, EarlyView.
Abstract Elasmobranch teeth are highly mineralized structures that constitute the majority of the fossil record for this group. Despite their taxonomic and evolutionary significance, detailed descriptions of dental morphology remain scarce. The order Carcharhiniformes, the most diverse among sharks, comprises 304 valid species that display remarkable ...
Flávia Zanini, Karla D. A. Soares
wiley   +1 more source

Abundance, Distribution and Population Trends of Waterbirds in the Usangu Wetland: A Biodiversity Hotspot Threatened by Human Activities. [PDF]

Ecol Evol
Chaula A, Ignas S, Ngonyoka A.
europepmc   +1 more source

An integrative approach to understanding bird origins

Science, 2014
Xing Xu, Zhonghe Zhou, R. Dudley, S. Mackem, C. Chuong, G. Erickson, D. Varricchio   +6 more
semanticscholar   +1 more source

Endothermy, neuron counts, and other issues: Further remarks on neurocognitive evolution in fossil vertebrates

The Anatomical Record, EarlyView.
Abstract Last year, we challenged the view that large‐bodied theropod dinosaurs such as Tyrannosaurus rex resembled primates in cognition and behavior, a proposition made by Herculano‐Houzel in 2023. More recently, Jensen et al. have criticized our work on this topic, raising methodological and conceptual issues.
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Hady George, Thomas R. Holtz Jr., Darren Naish, Grant R. Hurlburt   +5 more
wiley   +1 more source

Ancient DNA reveals elephant birds and kiwi are sister taxa and clarifies ratite bird evolution

Science, 2014
Kieren J. Mitchell, B. Llamas, J. Soubrier, Nicolas J. Rawlence, T. Worthy, Jamie R. Wood, Michael S. Y. Lee, A. Cooper   +7 more
semanticscholar   +1 more source

Role of soft tissue and bone interactions in the developmental integration and modularity of the skull in neural crest‐specific gap junction alpha‐1 knockout mice

The Anatomical Record, EarlyView.
Abstract The vertebrate skull is composed of bones derived from neural crest cells and mesoderm. The evolutionary capacity of the skull has been linked, in part, to the emergence of neural crest cells; however, this increased capacity for evolutionary change requires that variation within neural crest‐ and mesoderm‐derived bones remains partly ...
Alyssa C. Moore, Madeline Tourigny, Diana Quinonez, Kevin Barr, Matthew W. Grol, Katherine E. Willmore   +5 more
wiley   +1 more source

Identifying avian influenza hotspots in wild birds in the Netherlands. [PDF]

PLoS One
Petie R, Costa EF, Kampichler C, Slaterus R, Gonzales JL.   +4 more
europepmc   +1 more source

Gonadal development in scorpion mud‐turtles, Kinosternon scorpioides, in a controlled environment

The Anatomical Record, EarlyView.
Stage 20 was identified as the critical point for gonadal differentiation in Kinosternon scorpioides, providing key insights into sex determination. These findings enhance conservation strategies by supporting reproductive management and population viability in both in situ and ex situ programs. Abstract Research on gonadal development including sexual
Brenda Braga, Verônica Oliveira‐Bahia, Maria Auxiliadora Ferreira, José Ribamar Felipe Marques, Diva Araújo Guimarães   +4 more
wiley   +1 more source

NUTCRACKER orchestrates cortical cell divisions and sustains stem cell niche integrity in the rice root meristem. [PDF]

J Exp Bot
Kirschner GK, Oyarce P, Yao J, Aljedaani F, Butt H, Smet W, Mahfouz M, Blilou I.   +7 more
europepmc   +1 more source

Bird–building collisions in the United States: Estimates of annual mortality and species vulnerability

, 2014
S. Loss, Tom C. Will, Sara S. Loss, P. Marra   +3 more
semanticscholar   +1 more source