Although species are central units for biological research, recent findings in genomics are
raising awareness that what we call species can be ill-founded entities due to solely …

Parker, Baker, and Smith provided the first robust theory explaining why anisogamy evolves
in parallel in multicellular organisms. Anisogamy sets the stage for the emergence of …

Unisexual animals are commonly found in some polyploid species complexes, and most of
these species have had a long evolutionary history. However, their method for avoiding …

This paper summarizes the trends in nematode species description and systematics
emerging from a comparison of the latest comprehensive classification and census of …

Hybridization is a common evolutionary process with multiple possible outcomes. In
vertebrates, interspecific hybridization has repeatedly generated parthenogenetic hybrid …

Although obligately asexual lineages are thought to experience selective disadvantages
associated with reduced efficiency of fixing beneficial mutations and purging deleterious …

Asexual reproduction is ancestral in prokaryotes; the switch to sexuality in eukaryotes is one
of the major transitions in the history of life. The study of the maintenance of sex in …

Identifying the alleles that reduce hybrid fitness is a major goal in the study of speciation
genetics. It is rare to identify systems in which hybrid incompatibilities with minor phenotypic …

Although commonly reported among widespread marine taxa, hybridization has only been
recorded for one species of marine sponge to date. Sponges have evolved an array of …

Hybridization is one of the major factors contributing to the emergence of highly successful
parasites. Hybrid vigour can play an important role in this process, but subsequent rounds of …