Live-bearing cockroach genome reveals convergent evolutionary mechanisms linked to viviparity in insects and beyond [PDF]
iScience, 2023 Summary: Live birth (viviparity) has arisen repeatedly and independently among animals. We sequenced the genome and transcriptome of the viviparous Pacific beetle-mimic cockroach and performed comparative analyses with two other viviparous insect ...
Bertrand Fouks +13 more
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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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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
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Heads or tails first? Evolution of fetal orientation in ichthyosaurs, with a scrutiny of the prevailing hypothesis [PDF]
BMC Ecology and Evolution, 2023 According to a longstanding paradigm, aquatic amniotes, including the Mesozoic marine reptile group Ichthyopterygia, give birth tail-first because head-first birth leads to increased asphyxiation risk of the fetus in the aquatic environment.
Feiko Miedema +6 more
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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
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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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Frontiers in Zoology, 2021 Parity mode (oviparity/viviparity) importantly affects the ecology, morphology, physiology, biogeography and evolution of organisms. The main hypotheses explaining the evolution and maintenance of viviparity are based on bioclimatic predictions and also ...
J. L. Horreo +2 more
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Frontiers in Ecology and Evolution, 2022 In a captive colony of Chersina angulata in Cape Town, South Africa, we observed in 2015/16 retention of the last egg clutch inside the female until the hatching stage was reached, conforming to the generally accepted definition of viviparity ...
Gerald Kuchling, Margaretha D. Hofmeyr
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