Results 41 to 50 of about 1,738 (172)

New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America [PDF]

open access: yesJournal of Paleontology, 2016
AbstractCeratodontid lungfishes are generally rare, poorly represented elements of North America’s Mesozoic ecosystems, with previously known maximum diversity in the Late Jurassic. Herein we describe four new species of the form genusCeratodus, from the Cretaceous of the Western Interior, considerably expanding fossil representation of post-Triassic ...
Joseph A. Frederickson   +1 more
openaire   +1 more source

Taxonomic Composition and Trophic Structure of the Continental Bony Fish Assemblage from the Early Late Cretaceous of Southeastern Morocco [PDF]

open access: yes, 2015
International audienceThe mid-Cretaceous vertebrate assemblage from south-eastern Morocco is one of the mostdiversified continental vertebrate assemblages of this time worldwide.
Boudad, Larbi   +5 more
core   +4 more sources

Intra-Testicular Signals Regulate Germ Cell Progression and Production of Qualitatively Mature Spermatozoa in Vertebrates [PDF]

open access: yes, 2014
Spermatogenesis, a highly conserved process in vertebrates, is mainly under the hypothalamic-pituitary control, being regulated by the secretion of pituitary gonadotropins, FSH and LH, in response to stimulation exerted by Gonadotropin Releasing Hormone (
Gilda Cobellis   +6 more
core   +2 more sources

Evolution and Development of the Atrial Septum

open access: yesThe Anatomical Record, Volume 302, Issue 1, Page 32-48, January 2019., 2019
ABSTRACT The complete division of the atrial cavity by a septum, resulting in a left and right atrium, is found in many amphibians and all amniotes (reptiles, birds, and mammals). Surprisingly, it is only in eutherian, or placental, mammals that full atrial septation necessitates addition from a second septum.
Bjarke Jensen   +2 more
wiley   +1 more source

The Lungfish: Creature from the Past [PDF]

open access: yes, 1975
The survivor from prehistoric times, the salmon-fleshed Queensland lungfish, may fall victim to agricultural destruction of its ...
Grigg, Gordon C.
core  

The Chinchilla Local Fauna: an exceptionally rich and well-preserved Pliocene vertebrate assemblage from fluviatile deposits of south-eastern Queensland, Australia [PDF]

open access: yes, 2015
The Chinchilla Sand is a formally defined stratigraphic sequence of Pliocene fluviatile deposits that comprise interbedded clays, sands, and conglomerates located in the western Darling Downs, south-east Queensland, Australia.
Louys, Julien, Price, Gilbert
core   +1 more source

The pH sensitivity of Aqp0 channels in tetraploid and diploid teleosts

open access: yesThe FASEB Journal, Volume 29, Issue 5, Page 2172-2184, May 2015., 2015
ABSTRACT Water homeostasis and the structural integrity of the vertebrate lens is partially mediated by AQP0 channels. Emerging evidence indicates that external pH may be involved in channel gating. Here we show that a tetraploid teleost, the Atlantic salmon, retains 4 aqp0 genes (aqp0a1, ‐0a2, ‐0b1, and ‐0b2), which are highly, but not exclusively ...
Francois Chauvigné   +5 more
wiley   +1 more source

The Monogenean Parasite Fauna of Cichlids: A Potential Tool for Host Biogeography

open access: yesInternational Journal of Evolutionary Biology, Volume 2011, Issue 1, 2011., 2011
We discuss geographical distribution and phylogeny of Dactylogyridea (Monogenea) parasitizing Cichlidae to elucidate their hosts′ history. Although mesoparasitic Monogenea (Enterogyrus spp.) show typical vicariant distribution, ectoparasitic representatives from different continents are not considered sister taxa, hence their distribution cannot result
Antoine Pariselle   +6 more
wiley   +1 more source

Ig heavy chain genes and their locus in grass carp Ctenopharyngodon idella [PDF]

open access: yes, 2010
The cDNA and genomic sequences of IgD and IgZ were characterized in grass carp Ctenopharyngodon idella in the present study, and with the identification of a BAC clone covering zeta, mu, and delta genes, the IgH locus containing these Ig genes and other ...
Chang, M. X.   +9 more
core   +1 more source

Darwin, Haeckel, and the “Mikluskan gas organ theory”

open access: yesDevelopmental Dynamics, Volume 253, Issue 4, Page 370-389, April 2024.
Abstract A previously unknown reference to the Russian ethnologist, biologist, and traveler Nikolai N. Miklucho‐Maclay (1846–1888) was discovered in correspondence between Charles Darwin (1809–1882) and Ernst Haeckel (1834–1919). This reference has remained unknown to science, even to Miklucho‐Maclay's biographers, probably because Darwin used the ...
Ingmar Werneburg   +2 more
wiley   +1 more source

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