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Fig. 1. Comparative sketch of adult hagfish, lamprey and zebrafish inner
ears. Lateral views with anterior to the left; not to scale. Sensory
maculae are shown in dark grey; cristae are shown in light grey. Note the
single macula communis in the hagfish and lamprey ear, and the asymmetric
arrangement of three separate sensory maculae in the zebrafish ear. AH, V and
PH are the anterior horizontal, vertical and posterior horizontal regions,
respectively, of the lamprey macula communis. (Adapted from diagrams in
Gegenbaur, 1898;
de Burlet and Versteegh, 1930;
Lowenstein, 1971;
Hagelin, 1974;
Bang et al., 2001.)