show Abstracthide AbstractThe Amazon molly, Poecilia formosa (Teleostei: Poeciliinae) is an unisexual, all-female species. It evolved through the hybridisation of two closely related sexual species and exhibits clonal reproduction by sperm dependent parthenogenesis (or gynogenesis). Our interest is focussed on genomic and transcriptomic features of this unusual species, like the genomic consequences of the absence of meiosis for many generations.