Online Mendelian Inheritance in Animals (OMIA) is a catalogue/compendium of inherited disorders, other (single-locus) traits, and associated genes and variants in more than 500 vertebrate animal species (other than human, mouse, rats, zebrafish and western clawed frog, which have their own resources). The 'omia' prefix is used for phenes, either across species (omia:001000) or in a specific species (omia:001000-9615)