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Topics containing the search term "photoreceptors" are:

1. Echolocation in birds: oilbirds and swiftlets
   The best known example of echolocating birds are the South American oilbirds (Steatornis caripensis), so called because their flesh yields abundant oil.

2. Vision in echinoderms
   Among brittlestars and sea urchins we find visual systems that in some ways rival the arthropods in the form of compound eye-like structures.

3. Compound eyes in sabellid annelids
   Compound eyes have evolved convergently in the annelids, notably amongst the sabellids, where they evidently serve as an optical alarm system.

4. Camera eyes in alciopid annelids
   There is a striking example in the group known as the alciopids, which are pelagic polychaetes. The similarity of their camera eye to the vertebrate eye has attracted considerable comment.

5. Camera-like eyes in arthropods
   Arthropods are famous for their compound eyes, but some groups have had a fair crack at evolving the optically superior camera eye…

6. Strepsipterans: convergent halteres and eyes
   Strepsipteran females spend their whole life inside a wasp. The males are rather more exciting, particularly in terms of convergence…

7. Camera eyes of cephalopods
   The remarkable similarity between the camera eyes of cephalopods and vertebrates is one of the best-known examples of evolutionary convergence.

8. Octopus and other cephalopods: convergence with vertebrates
   What could be more different from us than the alien-like octopus? Hold on. Look it in the eye and think again.