Larus lacus

Larus lacus is an extinct species of gull that lived in North America during the Late Pliocene.

Etymology
The 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."

Description
Larus lacus specimens stem from Sarasota County, Florida. The humerus of Larus lacus most closely resembles the Hartlaub's gull (Chroicocephalus hartlaubii, formerly Larus hartlaubii), black-headed gull (Chroicocephalus ridibundus; formerly Larus ridibundus), brown-hooded gull (Chroicocephalus maculipennis; formerly Larus maculipennis), and Franklin's gull (Leucophaeus pipixcan; formerly Larus pipixcan).