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Figure 4 | Frontiers in Zoology

Figure 4

From: Evolutionary origins of ultrasonic hearing and laryngeal echolocation in bats inferred from morphological analyses of the inner ear

Figure 4

(A) Relationship between log basilar membrane length and log body mass0.33. Coloured points indicate the hypothetical modern bat common ancestor bat (grey diamond); Old World fruit bats (orange); echolocating Yinpterochiroptera (blue); Yangochiroptera (green); non-bat placental mammals (brown); subterranean mole-rats (pink); semi-aquatic seals (light blue); marsupials (white). The regression lines are shown for the placental mammal species, including bats (solid line) and excluding bats (dashed line). (B) Estimated hearing limits of the hypothetical modern bat common ancestor based on ancestral reconstructions of inner ear morphology. High frequency hearing limits at (i) 30 and (ii) 60 dB, respectively, are estimated using the relationship between log relative membrane length and hearing limits in extant taxa. Low frequency hearing limits at (iii) 30 and (iv) 60 dB, respectively, are estimated using the relationship between the product of log basilar membrane length and the number of cochlear turns with low frequency hearing limits in extant taxa, following[18, 20]. For colour coding see Figure 4a.

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