The external morphology of the eye is indistinguishable from wild type in mutant animals. Mutant rhabdomeres are fragmented and rhabdomeres are joined to each other and to stalks of other photoreceptors by inappropriate adhesions. prom² photoreceptors are indistinguishable from wild type at 37% pupal development (p.d.). The mutant phenotype is clearly seen by 55% p.d. The inter-rhabdomeral space fails to open and photoreceptor cells contact each other in both rhabdomere tip-to-tip and rhabdomere-to-stalk contacts. Distinctive stalk and rhabdomere membranes are evident, but they are irregularly ordered. Loops of stalk membrane are trapped by abnormal adhesions. Contacts between photoreceptor cells seen in adult ommatidia commonly include those seen during rhabdomere extension; the rhabdomere of R4 often bifurcates to contact R2 and R7. In addition, strong R5/R6 contact (not seen during extension) is also common in mutant adults.

The external morphology of the eye is indistinguishable from wild type in mutant animals. Mutant rhabdomeres are fragmented and rhabdomeres are joined to each other and to stalks of other photoreceptors by inappropriate adhesions. eyc¹ photoreceptors are indistinguishable from wild type at 37% pupal development (p.d.). The mutant phenotype is clearly seen by 55% p.d. The inter-rhabdomeral space fails to open and photoreceptor cells contact each other in both rhabdomere tip-to-tip and rhabdomere-to-stalk contacts. Distinctive stalk and rhabdomere membranes are evident, but they are irregularly ordered. Loops of stalk membrane are trapped by abnormal adhesions. Contacts between photoreceptor cells seen in adult ommatidia commonly include those seen during rhabdomere extension; the rhabdomere of R4 often bifurcates to contact R2 and R7. In addition, strong R5/R6 contact (not seen during extension) is also common in mutant adults.