New Specimens of Nemegtomaia from Mongolia Figure 9. The nest of Nemegtomaia barsboldi, MPC-D 107/15. A, disposition of preserved eggs within the nest. Eggshells have been recovered under the skull (B), left pes (C) and leg (D), suggesting the direct apposition of the oviraptorid on top of the eggs. During the early excavation of the nest, it was possible to document a lower layer of eggs lying approximately 10 cm below the body (E–G). doi:10.1371/journal.pone.0031330.g009 Eggs None of the eggs is preserved in its entirety, and therefore all of the dimensions of an egg cannot be measured accurately (Fig. 9A). Available data on oviraptorid eggs in the literature [5– 7,20,21,60,63,64] indicate an average length of 17 cm (min = 11.5 cm, max = 25 cm), and a width of 7 cm (min = 5 cm, max = 8.5 cm). By comparison, the most complete eggs found in specimen MPC-D 107/15 are estimate to be 5 to 6 cm wide and 14 to 16 cm long. Preserved eggshells are macroscopically nearly identical to those described by Norell et al. [20,21] and can be referred to the elongatoolithid oofamily [60,65,66], originally considered to be the ornithoid basic type (Figure 10). Eggshells are relatively thin, ranging between 1 and 1.2 mm. The outer surfaces of the eggs are ornamented with linearituberculate ridges and nodes that rise approximately 0.3 mm above the shell (Fig. 10F). Such longitudinal ornamentations do not show any specific trend PLoS ONE | www.plosone.org 12 February 2012 | Volume 7 | Issue 2 | e31330