Phenotypes involving absence of otoliths. (A) The morphology of semicircular canals is normal in empty ear (emp)m107 but the otoliths do not form. At 36 hpf the otic vesicle of helter skelter (hek)m504 larvae (C) appears to be larger than its wild-type counterpart (B). The ear of znikam (znk)m574 is smaller at 3 dpf than its wild-type equivalent and the otic capsule less distinct (D, compare with Fig. 5D). In some outcrosses ectopic otoliths form in the ears of haos (hos)m751 animals (arrowheads in E). In all panels anterior is left and dorsal up. A and E show larval ears at 5 dpf.