Many argosrlt ommatidia mis-rotate; the variance (s.d.) in degree of rotation is greater than in wild type in adult eyes and the mean angle of orientation of the ommatidia is only 77.84[o] (compared to 90[o] in wild type).
Homozygotes, argosrlt/argosΔ7 or argosrlt/Df(3L)st7P animals exhibit a ommatidial rotation phenotype. Clusters are seen that are both over and under-rotated with respect to their neighbours and developmental stage. Mutant animals do not exhibit any photoreceptor R3/R4 cell fate defects.
About 12% of ommatidia in homozygous argosrlt animals exhibit extra R cells. Of those that ommatidia that remain about 49% exhibit misrotations, about 6% exhibit achirality, and about 1% exhibit the wrong chirality. About 11% of ommatidia in argosΔ7/argosrlt animals exhibit extra R cells. Of those that ommatidia that remain about 52% exhibit misrotations, about 1% exhibit achirality, and about 1% exhibit the wrong chirality. About 16% of ommatidia in argos5F4/argosrlt animals exhibit extra R cells. Of those that ommatidia that remain about 53% exhibit misrotations, about 2% exhibit achirality, and about 0.3% exhibit the wrong chirality.
The addition of argosrlt/+ enhances the eye cell polarity phenotype seen in fz19/fz20 animals.
Photoreceptor orientation is abnormal. The majority of ommatidia have the normal number of photoreceptors, in normal trapezoidal configuration, though 17% of ommatidia have an extra photoreceptor cell. But 47% of photoreceptor clusters actually rotate more than 90o. nmo mutants are epistatic to argosrlt with respect to ommatidial precluster orientation.