Results 21 to 30 of about 2,701 (193)

Parturition time for the Blacktip shark, Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae), in Southwestern Atlantic [PDF]

open access: yesNeotropical Ichthyology, 2020
The determination of the period of parturition and identification of nursery areas are fundamental for the management and conservation of a fishing resource.
Jones Santander-Neto   +2 more
doaj   +1 more source

Diversification of the Neoselachii (Chondrichthyes) during the Jurassic and Cretaceous [PDF]

open access: yes, 2006
The Neoselachii are a monophyletic group including all of the extant sharks and rays. They underwent rapid diversification throughout the Jurassic and Cretaceous, going from low-diversity assemblages of members of extinct orders in the Late Triassic to ...
Underwood, Charlie J.
core   +1 more source

New host and ocean records for Driocephalus cerebrinoxius (Sphyriidae, Siphonostomatoida) and a reconsideration of phylogeny within Sphyriidae. [PDF]

open access: yesActa Ichthyologica et Piscatoria, 2006
Background. Driocephalus cerebrinoxius is an unusual representative of an unusual family of parasitic copepods (Sphyriidae, Siphonostomatoida, Copepoda). This report documents new host and ocean records for D. cerebrinoxius and considers the phylogenetic
G.W. Benz   +4 more
doaj   +3 more sources

Os carcharhiniformes (cCondrichthyes, Neoselachii) da Bacia de Alvalade (Portugal)

open access: yesSpanish Journal of Palaeontology, 2021
The uppermost Miocene, Esbarrondadoiro Formation (Alvalade basin, Portugal) yielded more than 10 thousandSelachian teeth at Santa Margarida, Esbarrondadoiro and Vale de Zebro outcrops. Forty-five taxa were identifiedbelonging to the orders Hexanchiformes, Squaliformes, Lamniformes, Carcharhiniformes, Torpediniformes and Myliobatiformes.
Miguel Telles Antunes   +1 more
openaire   +2 more sources

Sharks of the order Carcharhiniformes from the British Coniacian, Santonian and Campanian (Upper Cretaceous). [PDF]

open access: yes, 2008
Bulk sampling of phosphate-rich horizons within the British Coniacian to Campanian (Upper Cretaceous) yielded very large samples of shark and ray teeth.
AGASSIZ L. J. R.   +55 more
core   +1 more source

New species and new records of camallanid nematodes (Nematoda, Camallanidae) from marine fishes and sea snakes in New Caledonia

open access: yesParasite, 2019
Recent examinations of camallanid nematodes (Camallanidae) from marine fishes off New Caledonia, collected in the years 2003–2011, revealed the presence of the following five new species of Procamallanus Baylis, 1923, all belonging to the subgenus ...
Moravec František, Justine Jean-Lou
doaj   +1 more source

Environmental controls on the distribution of neoselachian sharks and rays within the British Bathonian (Middle Jurassic). [PDF]

open access: yes, 2003
Extensive sampling from a range of facies within the Bathonian (Middle Jurassic) of southern England has allowed the palaeoenvironmental distribution of a number of taxa of neoselachian sharks and rays to be assessed.
Underwood, Charlie J.
core   +1 more source

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

open access: yesBrazilian 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   +1 more
doaj   +1 more source

Trypanorhynch Assemblages Indicate Ecological and Phylogenetical Attributes of Their Elasmobranch Final Hosts [PDF]

open access: yes, 2017
This study explores non-metric multidimensional scaling (nMDS) as a tool for investigating parasites as indicators of the elasmobranch biology. An attractive feature of nMDS is its ability to allow assemblage-level parasite data to be simultaneously ...
Palm, Harry W.   +2 more
core   +1 more source

Morphology of the anterior vertebral region in elasmobranchs: special focus, Squatiniformes [PDF]

open access: yesFossil Record, 2011
The morphology of extant and extinct Squatiniformes is well conserved within this lineage, but differences are of consequence to character interpretations for phylogenetic analyses.
K. M. Claeson, A. Hilger
doaj   +5 more sources

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