Data from: Tree of sex: a database of sexual systems

The vast majority of eukaryotic organisms reproduce sexually, yet the
nature of the sexual system and the mechanism of sex determination often
vary remarkably, even among closely related species. Some species of
animals and plants change sex across their lifespan, some contain
hermaphrodites as well as males and females, some determine sex with
highly differentiated chromosomes, while others determine sex according to
their environment. Testing evolutionary hypotheses regarding the causes
and consequences of this diversity requires interspecific data placed in a
phylogenetic context. Such comparative studies have been hampered by the
lack of accessible data listing sexual systems and sex determination
mechanisms across the eukaryotic tree of life. Here, we describe a
database developed to facilitate access to sexual system and sex
chromosome information, with data on sexual systems from 11038 plant, 709
fish, 173 amphibian, 593 non-avian reptilian, 195 avian, 479 mammalian,
and 11556 invertebrate species.