Larus lacusLarus lacus is an extinct species of gull that lived in North America during the Late Pliocene.EtymologyThe genus name Larus derives from Ancient Greek, referring to a seabird. The species name lacus derives from Latin, meaning "lake or standing body of water, in reference to the lagoonal deposits at the type locality."DescriptionLarus lacus specimens stem from Sarasota County, Florida. The humerus of Larus lacus most closely resembles the Hartlaub's gull, black-headed gull, brown-hooded gull, and Franklin's gull.