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. 2013 Jun 21;8(6):e66624. doi: 10.1371/journal.pone.0066624

Figure 71. Characters of the bony labyrinth traced across placental mammal phylogeny.

Figure 71

Characters: 1, Entry of posterior limb of lateral semicircular canal – (0): secondary common crus, (1): posterior ampulla, (2): vestibule; 2, Position of plane of lateral semicircular canal relative to posterior semicircular canal when labyrinth is in anterior view – (0): low (sagittal labyrinthine index = 0.0), (1): hight (sagittal labyrinthine index >0.0); 3, Largest semicircular canal arc radius of curvature – (0): anterior canal, (1): lateral canal, (2): posterior canal; 4, Shape of cochlear spiral – (0): low (aspect ratio ≤0.55), (1): high (aspect ratio >0.55); 5, Number of cochlear turns – (0): 1 to 2 turns (∼360–720°), (1): 2 to 3 turns (720–1080°), (2): over 3 turns (>1080°); 6, Percent volume of total bony labyrinth conrtributed by cochlea – (0): ≤50%, (1): 51–75%, (2): >75%.