Fertilization mode drives sperm length evolution across the animal tree of life. Nature Ecology & Evolution , 2021; DOI: 10.1038/s41559-021-01488-y Cite This Page : ...

Researchers used to believe that internal fertilization and the carrying of the young inside the mother’s body until birth together made up a specialized form of reproduction that first appeared ...

Nature's solution was internal fertilization — direct delivery from the male to the female, which required external genitalia. Tschopp and colleagues decided to trace the lineage of external ...

Internal and external fertilization: The fertilization which occurs inside the female body is called internal fertilization i.e. it takes place in mammals including human beings, birds and reptiles.

Thus, at some point, early fishes must have lost the internal fertilization method seen in placoderms, before some of their descendants 're-invented' organs with a similar function — ranging ...

John A. Long wasn't particularly interested in ancient animal sex. A successful paleontologist, he was more concerned with bones than the history of boning -- but then he stumbled on "the mother ...

The idea that placoderms relied on internal fertilization isn’t new. In 1938, paleontologist D.M.S. Watson published a report on a placoderm called Rhamphodopsis that seemed to preserve claspers ...

This implies that internal fertilization might have evolved right alongside vertebrates—perhaps it served as the reproductive strategy of choice for the earliest examples of our most ancient ...

In reptiles, it’s difficult to pin down when fertilization actually happens, in large part due to internal fertilization and sperm storage, where females can store sperm for extended periods.

To examine how the location of fertilization influences sperm evolution, the researchers compiled data on sperm size from more than 3,200 animal species - ranging from corals to mammals, including ...