Unknown structures in multituberculate skull.
D000818:Animals; D005004:Ethmoid Bone / Q000033:anatomy & histology; D008322:Mammals / Q000033:anatomy & histology* / Q000145:classification; D010163:Paleontology; D012886:Skull / Q000033:anatomy & histology*; D013100:Sphenoid Bone / Q000033:anatomy & histology