Asexual species universally seem to have come into being very recently. They likely go extinct due to lack of genetic diversity and attendant mutational load catastrophe and/or losing arms races with parasites.
Bdelloidea are an interesting counterexample: they evolved obligate parthenogenesis ~25 mya.
My understanding from reading Mitochondria: Power, Sex, Suicide is that they are not truly asexual but turn out to do some sexual recombination. I don’t remember the details and I’m not an expert though so wouldn’t put my hand in the fire for it.
Bdelloidea are an interesting counterexample: they evolved obligate parthenogenesis ~25 mya.
My understanding from reading Mitochondria: Power, Sex, Suicide is that they are not truly asexual but turn out to do some sexual recombination. I don’t remember the details and I’m not an expert though so wouldn’t put my hand in the fire for it.