Endocranial volume, endosseous labyrinth volume, body mass and encephalization quotients (EQ) of sampled charadriiform taxa.

Inner ear endosseous labyrinth volume was calculated by averaging computed values for the right and left labyrinths. Body mass values denoted by an ‘*’ are from previously published sources [26], [38] owing to lack of data for sampled skeletonized specimens. Based on comparisons with other known Mancallinae skulls (e.g., SDSNH 25236, SDSNH 68312; [28]), the size of the Mancallinae sp. skull (SDSNH 23753) sampled represents a small individual likely corresponding to the size of Mancalla vegrandis. The size of Mancalla vegrandis correlates with values attributed to ‘Mancalla milleri’ in the morphometric study of Livezey [28], [34], and thus, the mass estimated for ‘Mancalla milleri’ by Livezey (1988) is used here.