The developmental and structural uniqueness of the embryo of the extremophile viviparous nematode, Tokorhabditis tufae [PDF]
Frontiers in Physiology, 2023 Viviparity, a reproductive form that supplies nutrients to the embryo during gestation, has repeatedly and independently occurred in multiple lineages of animals.
Tatsuya Yamashita +3 more
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Convergent genomic signatures associated with vertebrate viviparity [PDF]
BMC BiologyBackground Viviparity—live birth—is a complex and innovative mode of reproduction that has evolved repeatedly across the vertebrate Tree of Life. Viviparous species exhibit remarkable levels of reproductive diversity, both in the amount of care provided ...
Rhiannon V. Eastment +2 more
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Demography Meets Climate Change: Life History Challenges for a Neotropical Viviparous Lizard. [PDF]
Ecol EvolConsidering the current biodiversity crisis, it is crucial to understand the impact of global environmental changes on natural populations. Analyzing demographic parameters from long‐term studies is the most effective approach to uncovering patterns that describe population dynamics.
Santos MLG +3 more
europepmc +2 more sources
Living Environment and Basic Features of the Nematodes Associated with Dung Beetle Onthophagus atripennis [PDF]
Journal of NematologyViviparity is a very rare reproductive mode in nematodes, having been documented in only six species. Five of these species have been isolated among the dung beetles Onthophagus, suggesting that studying the environments associated with dung beetles may ...
Ikeda Yuya +2 more
doaj +2 more sources
Higher locomotor costs of pregnancy in viviparous compared to oviparous common lizards (Zootoca vivipara) [PDF]
Ecology and EvolutionPregnancy is a physiological cost of reproduction for animals that rely on fleeing to avoid predators. Costs of reproduction are predicted to differ between alternative reproductive strategies or modes, such as egg‐laying (oviparity) or live‐bearing ...
Robert Hussain +2 more
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Geographical distribution and phoretic associations of the viviparous nematode Tokorhabditis atripennis with Onthophagus dung beetles in Japan [PDF]
Journal of NematologyViviparity is generally considered to be rare in animals. In nematodes, only six species of Rhabditida are viviparous. Five of these species have been identified in association with Onthophagus dung beetles, with Tokorhabditis atripennis being repeatedly
Ikeda Yuya +3 more
doaj +2 more sources
Evolutionary Patterns of Maternal Recognition of Pregnancy and Implantation in Eutherian Mammals [PDF]
AnimalsThe implantation of the embryo into the maternal endometrium is a complex process associated with the evolution of viviparity and placentation in mammals.
Henrique Bartolomeu Braz +7 more
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Terrestrial origin of viviparity in mesozoic marine reptiles indicated by early triassic embryonic fossils. [PDF]
PLoS ONE, 2014 Viviparity in Mesozoic marine reptiles has traditionally been considered an aquatic adaptation. We report a new fossil specimen that strongly contradicts this traditional interpretation.
Ryosuke Motani +4 more
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Early Development Drives Variation in Amphibian Vulnerability to Global Change
Frontiers in Ecology and Evolution, 2022 Understanding how natural selection determines species’ life histories can reveal their resilience or sensitivity to anthropogenic changes. For example, the safe harbor hypothesis posits that natural selection will favor life histories that maximize the ...
George C. Brooks, Holly K. Kindsvater
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Animals, 2021 Oviducal glands (OGs) are distinct expanded regions of the anterior portion of the oviduct, commonly found in chondrichthyans, which play a key role in the production of the egg in-vestments and in the female sperm storage (FSS).
Martina Francesca Marongiu +8 more
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