Two's company: Monozygotic twinning in the small-spotted catshark (Scyliorhinus canicula). [PDF]
J Fish BiolAbstract Developmental abnormalities in elasmobranchs (sharks and rays) are rarely documented, with reported cases primarily involving fin or cranial deformities. Monozygotic twinning, the formation of identical twins from a single zygote, is particularly rare in these species and has been observed overwhelmingly in viviparous elasmobranchs.
Gajić AA +6 more
europepmc +2 more sources
Sexual Size Dimorphism in Rays and Skates (Elasmobranchii: Batoidea). [PDF]
Ecol EvolInterspecific trends in sexual size dimorphism are superficially similar in batoids to sharks, but are underlain by different modes of evolution. Selection for substantial SSD in batoids seems to be weaker than in sharks. This may be due to differences in the strength of fecundity selection.
Gayford JH +4 more
europepmc +2 more sources
Morphology of the unique egg cases of hornsharks (Heterodontiformes: Heterodontidae). [PDF]
J Fish BiolAbstract Many of the egg cases of oviparous chondrichthyans remain unknown and undescribed in the literature. Egg cases can be a useful taxonomic character for species distinction and can be a valuable indicator of a species distribution in the field.
O'Neill HL, Tokunaga K, White WT.
europepmc +2 more sources
Artificial Insemination and Parthenogenesis in the Zebra Shark Stegostoma tigrinum
Frontiers in Marine Science, 2022 Maintaining self-sustaining populations of zoo and aquarium collections can be challenged when natural reproduction fails within mixed-sex populations; however, reproductive success can sometimes be restored with the application of reproductive ...
Lance Adams +7 more
doaj +1 more source
To What Extent Can Life History Strategies Inform Reptile Conservation Planning? [PDF]
Ecol EvolConservation planners must effectively target interventions to reduce the extinction risk of species. If we can use a species' life history strategies to predict their responses to interventions, this offers a promising approach to better understand species extinction risks and conservation potential.
Stevenson EA +4 more
europepmc +2 more sources
Animals, 2022 The sub-order Scorpenoidei appears to be particularly interesting due to the presence of intermediate stages between oviparity and viviparity in several species.
Cristina Porcu +8 more
doaj +1 more source
Growth and reproduction in captivity unveils remarkable life-history plasticity in the smallnose fanskate, Sympterygia bonapartii (Chondrichthyes: Rajiformes) [PDF]
, 2018 Analizamos el crecimiento y la reproducción de ejemplares de raya marmorada, Sympterygia bonapartii nacidas en cautiverio. Se obtuvieron ovicápsulas a partir de la oviposición de dos hembras capturadas en la naturaleza y mantenidas en el Acuario Temaikèn.
Abraham, Carolina +4 more
core +3 more sources
Pregnant Females as Historical Individuals: An Insight From the Philosophy of Evo-Devo
Frontiers in Psychology, 2021 Criticisms of the “container” model of pregnancy picturing female and embryo as separate entities multiply in various philosophical and scientific contexts during the last decades.
Laura Nuño de la Rosa +2 more
doaj +1 more source
Why are some species older than others? A large-scale study of vertebrates. [PDF]
, 2016 BACKGROUND: Strong variations are observed between and within taxonomic groups in the age of extant species and these differences can clarify factors that render species more vulnerable to extinction.
Cattin, L. +3 more
core +2 more sources