The first find in 1949 by Harold Weston Robbins, a partial fossil skeleton found near Alenquer, was in 1957 named Apatosaurus alenquerensis by Albert-Félix de Lapparent and Georges Zbyszewski.
In 1949, Harold Weston Robbins discovered the first partial fossil skeleton of a dinosaur near Alenquer. This specimen was subsequently named Apatosaurus alenquerensis by Albert-Félix de Lapparent and Georges Zbyszewski in 1957.