Source Book of Flying Primates Copies of most of these papers can be obtained by emailing Jack Pettigrew 1.
Megabats have the advanced pathway from eye to midbrain.
A cladistic analysis of brain traits that supports the flying primate hypothesis 3. Shows the range of visual abilities of microbats and the dramatic contrast with the visual system of flying foxes. As well as having lower acuity, microbats have an inverted position of the horizontal streak when compared with most other mammals, including flying foxes. The ghost bat has the most highly-developed visual system, with the largest number of retinal ganglion cells, of any microbat. One can therefore argue safely that visual specialisations that were found to be absent from ghost bats are unlikely to turn up in Amorphochilus, Furipterus or some other rare, non-visual microbat .