Results 1 to 10 of about 1,226 (194)

Reappraisal of the extinct barbelthroat shark †Bavariscyllium and the nebulous origin of carcharhiniform galeomorphs [PDF]

Communications Biology
We present a revised diagnosis of the extinct galeomorph shark †Bavariscyllium based on dental and skeletal material from the Upper Jurassic of Germany and test its purported carcharhiniform affinity through morphometric and phylogenetic analyses ...
Sebastian Stumpf, Julia Türtscher, Faviel A. López-Romero, Eduardo Villalobos-Segura, Arnaud Begat, Manuel Amadori, Richard P. Dearden, Bruce Lauer, René Lauer, Andreas Hecker, Jürgen Kriwet   +10 more
doaj   +5 more sources

Evolutionary Stability of the Shark Snout: Geometric Morphometrics of Ventral Facial Openings. [PDF]

Ann N Y Acad Sci
Landmark‐based geometric morphometrics of 453 shark species reveal that ventral head morphology is conserved across Selachii. Morphospace and ancestral reconstructions support strong phylogenetic control and limited divergence from ancestral conditions.
Aicardi S, Rosa G, Longo A, Bozzo M, Risso B, Damonte E, Amaroli A, Candiani S, Ferrando S.   +8 more
europepmc   +2 more sources

Diverse mechanical properties, composition, and performance of shark dermal denticles [PDF]

Nature Communications
Sharks have roamed the oceans since the Devonian, surviving multiple mass extinctions. Today, sharks are agile, streamlined swimmers, ambush predators hiding beneath the sand, and giants cruising in slow motion.
Rikke Beckmann Dahl, Ashish Ghimire, Yoshiyuki Iizuka, Jen-Pan Huang, Peter Rask Møller, Guan-Shuo Mai, Wei-Chen Lin, Cheng-Chun Yang, Yu-Chun Chou, Tsung-Hui Huang, Po-Yu Chen, Sheng-Feng Shen   +11 more
doaj   +2 more sources

Ion Torrent data for the genome assembly and phylogenomic placement of mitochondrial genomes with a focus on houndsharks (Chondrichthyes: Triakidae) [PDF]

Data in Brief
Here, we present, for the first time, the Ion TorrentⓇ next-generation sequencing (NGS) data for five houndsharks (Chondrichthyes: Triakidae), which include Galeorhinus galeus (number of bases pairs (bp) 17,487; GenBank accession number ON652874 ...
Jessica C. Winn, Aletta E. Bester-van der Merwe, Simo N. Maduna   +2 more
doaj   +2 more sources

Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change [PDF]

Scientific Reports, 2022
Estimating deep-time species-level diversification processes remains challenging. Both the fossil record and molecular phylogenies allow the estimation of speciation and extinction rates, but each type of data may still provide an incomplete picture of ...
Baptiste Brée, Fabien L. Condamine, Guillaume Guinot   +2 more
doaj   +2 more sources

Phylogeny explains capture mortality of sharks and rays in pelagic longline fisheries: a global meta-analytic synthesis [PDF]

Scientific Reports, 2022
Apex and mesopredators such as elasmobranchs are important for maintaining ocean health and are the focus of conservation efforts to mitigate exposure to fishing and other anthropogenic hazards.
Eric Gilman, Milani Chaloupka, Lee R. Benaka, Heather Bowlby, Mark Fitchett, Michel Kaiser, Michael Musyl   +6 more
doaj   +2 more sources

Habitat Availability, Jurassic and Cretaceous Origins of the Deep-Bodied Shark Morphotype and the Rise of Pelagic Sharks. [PDF]

Ecol Evol
We find support for a benthic origin of sharks, with four discrete transitions towards pelagic‐type morphology occurring during the Jurassic and Cretaceous. Increased habitat availability driven by biotic and abiotic environmental change may have driven shifts towards pelagic‐type morphology. These results may help explain discordance between molecular
Gayford JH, Jambura PL, Türtscher J, Sternes PC, Seamone SG, Shimada K.   +5 more
europepmc   +2 more sources

First record of albinism in the smooth dogfish Mustelus Schimitti Springer, 1939 (Carcharhiniformes - Triakidae) from Southern Brazil

Brazilian Archives of Biology and Technology, 2002
This paper reports on a subadult male specimen of the smooth dogfish, Mustelus schimitti, caught in the continental shelf of Rio Grande Sul, during winter of 1993, which exhibited the characteristics of total albinism.Este trabalho registra a primeira ...
Simone Ferreira Teixeira, Maria Lúcia Góes de Araújo   +1 more
exaly   +3 more sources

The Phenomenon of Piebaldism in Sharks: A Review of Global Sightings and Patterns. [PDF]

Ecol Evol
Chromatic disorders like piebaldism—a rare form of leucism causing partial pigment loss—have been documented in 25 wild shark cases across 17 species and 11 families, with varying anatomical distribution. This study compiles published and unpublished records to better understand the taxonomic and geographical spread of piebaldism and its potential ...
Whitehead DA, Parmegiani A, Gobbato J, Mizyan M, Askin A, Scroglieri S, Galli P, Seveso D, Montano S, Gayford JH.   +9 more
europepmc   +2 more sources

Annotated Bioinformatic Pipelines for Phylogenomic Placement of Mitochondrial Genomes [PDF]

Bio-Protocol
The limited standards for the rigorous and objective use of mitochondrial genomes (mitogenomes) can lead to uncertainties regarding the phylogenetic relationships of taxa under varying evolutionary constraints.
Jessica Winn, Aletta Bester-van der Merwe, Simo Maduna   +2 more
doaj   +2 more sources