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Fussy earl about to join up requiring specialized cells. I have RE-I--UL-E
I have checked Chambers and think I have it but there is not an exact spelling. Any help appreciated.

It looks like RETINULAE (Anag. of Earl around UNIT (Reversed))

Thanks-just about to amend the question. You are right as I have now found it! Apologies and thanks for quick response.

This is from the online dictionary:-

re·tin·u·la
n. pl. re·tin·u·lae
A cluster of pigment-containing photosensitive cells in each ommatidium of the compound eye of an arthropod.