Results 21 to 30 of about 656 (162)

Skeletal development in the heterocercal caudal fin of spotted gar (lepisosteus oculatus) and other lepisosteiformes. [PDF]

Dev Dyn, 2018
Background: The caudal fin of actinopterygians experienced substantial morphological changes during evolution. In basal actinopterygians, the caudal fin skeleton supports an asymmetrical heterocercal caudal fin, while most teleosts have a symmetrical homocercal caudal fin.
Desvignes T, Carey A, Braasch I, Enright T, Postlethwait JH.   +4 more
europepmc   +4 more sources

[Histology of reproductive cycle of tropical gar Atractosteus tropicus females (Lepisosteiformes: Lepisosteidae) in Tabasco, Mexico].

Revista de biologia tropical, 2013
In Southeast Mexico, A. tropicus is a species with great ecological, economic, cultural and aquaculture value, however wild populations have diminished due to diverse anthropological causes. The objective of this study was to characterize the reproductive cycle of A.
Otilio, Méndez-Marin, Arlette Amalia, Hernández Franyutti, Carlos Alfonso, Alvarez-González, Wilfrido Miguel, Contreras-Sánchez, Mari Carmen, Uribe Aranzábal   +4 more
  +11 more sources

A phylogenomic perspective on the radiation of ray-finned fishes based upon targeted sequencing of ultraconserved elements [PDF]

, 2012
Ray-finned fishes constitute the dominant radiation of vertebrates with over 30,000 species. Although molecular phylogenetics has begun to disentangle major evolutionary relationships within this vast section of the Tree of Life, there is no widely ...
Alfaro, Michael E., Faircloth, Brant C., Santini, Francesco, Sorenson, Laurie   +3 more
core   +9 more sources

Diet of the North American river otter (Lontra canadensis) in North Carolina using 2 methods

Wildlife Society Bulletin, Volume 47, Issue 4, December 2023., 2023
River otters (Lontra canadensis) are key predators in North Carolina's aquatic systems; however, they are often seen as competitors by trout fishermen and fish hatcheries. We conducted necropsies and analyzed the stomach contents using the standard observational methods and metabarcoding DNA analysis.
Charles W. Sanders II, Stephen F. Spear, Kristina Black, Colleen Olfenbuttel, Christopher S. DePerno   +4 more
wiley   +1 more source

The larval attachment organ of the bowfin Amia ocellicauda Richardson, 1836 (Amiiformes: Amiidae) and its phylogenetic significance

Journal of Fish Biology, Volume 103, Issue 6, Page 1300-1311, December 2023., 2023
Abstract Larval attachment organs (LAOs) are unicellular or multicellular organs that enable the larvae of many actinopterygian fishes to adhere to a substrate before yolk‐sac absorption and the free‐swimming stage. Bowfins (Amiiformes) exhibit a sizable LAO on the snout, which was first described in the late 19th and early 20th centuries.
Amanda K. Pinion, Ralf Britz, Kole M. Kubicek, Dustin S. Siegel, Kevin W. Conway   +4 more
wiley   +1 more source

The first Caipirasuchus (Mesoeucrocodylia, Notosuchia) from the Late Cretaceous of Minas Gerais, Brazil: new insights on sphagesaurid anatomy and taxonomy [PDF]

PeerJ, 2018
Field work conducted by the staff of the Centro de Pesquisas Paleontológicas Llewellyn Ivor Price of the Universidade Federal do Triângulo Mineiro since 2009 at Campina Verde municipality (MG) have resulted in the discovery of a diverse vertebrate fauna ...
Agustín G. Martinelli, Thiago S. Marinho, Fabiano V. Iori, Luiz Carlos B. Ribeiro   +3 more
doaj   +2 more sources

Distribution of the transcription factor islet‐1 in the central nervous system of nonteleost actinopterygian fish: Relationship with cholinergic and catecholaminergic systems

Journal of Comparative Neurology, Volume 531, Issue 11, Page 1126-1146, August 2023., 2023
Abstract Islet‐1 (Isl1) is one of the most conserved transcription factors in the evolution of vertebrates, due to its continuing involvement in such important functions as the differentiation of motoneurons, among other essential roles in cell fate in the forebrain.
Daniel Lozano, Nerea Moreno, Sara Jiménez, Adrián Chinarro, Ruth Morona, Jesús M. López   +5 more
wiley   +1 more source

The dental system of †Kazanichthys viatkensis (Actinopterygii, Acrolepididae) from the middle Permian of European Russia: palaeobiological and palaeoecological inferences

Papers in Palaeontology, Volume 9, Issue 4, July/August 2023., 2023
Abstract Among ray‐finned fishes (Actinopterygii), the crushing, durophagous feeding strategy first evolved in the early Carboniferous period, with the †Eurynotiformes possessing dentitions with single layers of partially to fully fused blunt teeth.
Aleksandr S. Bakaev, Zerina Johanson, Aaron LeBlanc   +2 more
wiley   +1 more source

Uncovering the promiscuous activity of IL‐6 proteins: A multi‐dimensional analysis of phylogeny, classification and residue conservation

Protein Science, Volume 31, Issue 11, November 2022., 2022
Abstract The IL‐6 family of cytokines, known for their pleiotropic behavior, share binding to the gp130 receptor for signal transduction with the necessity to bind other receptors. Leukemia inhibitory factor receptor is triggered by the IL‐6 family proteins: leukemia inhibitory factor (LIF), oncostatin‐M (OSM), cardiotrophin‐1 (CT‐1), ciliary ...
André da Costa, Ricardo Franco‐Duarte, Raul Machado, Andreia C. Gomes   +3 more
wiley   +1 more source

Phylogeny and evolutionary history of the amniote egg

Journal of Morphology, Volume 282, Issue 7, Page 1080-1122, July 2021., 2021
We review morphological features of the amniote egg and embryos in a large comparative phylogenetic framework, including all major clades of extant vertebrates. We discuss 40 characters that are relevant for an analysis of the evolutionary history of the vertebrate egg. Special attention is given to the morphology of the cellular yolk sac, the eggshell,
J. Matthias Starck, James R. Stewart, Daniel G. Blackburn   +2 more
wiley   +1 more source