sentences:  The name "Halimornis" means "bird of the sea".It would have lived alongside the more advanced seabird "Ichthyornis dispar".It is one of the only known enantiornithine birds to have lived in a marine environment, along with the Australian "Nanantius eos", the slightly younger "Martinavis" and "Ichthyornis" "minusculus", which was originally misidentified as "Ichthyornis" based on its presence in marine deposits.