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. 2007 Sep 12;2(9):e889. doi: 10.1371/journal.pone.0000889

Figure 2. Hearing adaptations in the temporal region of the non-pareiasaurian parareptiles from the Mezen River Basin.

Figure 2

(a) Lateral view of the skull of Bashkyroleter mesensis (PIN 162/30), which possesses the largest tympanum among the investigated taxa, as indicated by the non-sculptured posterolateral depression and the temporal emargination. (b) Lateral view of the skull of Macroleter poezicus (PIN uncataloged), the basalmost taxon within the clade. Bone abbreviations: f, frontal; j, jugal; m, maxilla; n, nasal; pmx, premaxilla; po, postorbital; pof, postfrontal; prf, prefrontal; qj, quadratojugal; sq, squamosal; st, supratemporal. Scale bar equals 2 cm.