1-day old homozygous adults raised at 18[o]C (in ambient light) show a 100% penetrant rhabdomere attachment phenotype, with 2 or more rhabdomeres in each ommatidium being attached to each other. The severity of the phenotype is similar in 15 and 40 day old mutant flies.
At 65% pupal development, the area of the inter-rhabdomeral space (IRS) in mutant ommatidia is 59% smaller than in controls, while in adults the IRS of mutant ommatidia appears similar to that of controls.
At 25 [o]C, some homozygous rumiΔ26
mutant animals reach adulthood but display very severe loss of bristles on the thorax and shortening of the legs. These flies die on the food after eclosion or trapped in the pupal case during eclosion, presumably owing to leg defects. As the temperature is decreased to room temperature (21-23 [o]C), approximately three quarter of the rumiΔ26
mutants exhibit an intermediate loss of microchaetae. At room temperature, the legs are not short, but subtle leg joint defects are commonly observed. When raised at 18 [o]C, most homozygous rumiΔ26
animals show loss of small patches of microchaetae in anterior parts of the notum and slight increase in the density of microchaetae. No shortening of the legs is observed at 18 [o]C, although most animals show minor defects in leg joints.
mutant animals fail to reach the pharate adult stage when cultured at temperatures above 25 [o]C.
mitotic clones raised at 30[o]C exhibit the loss of thoracic sensory bristles and margin loss and vein expansion in the wing.
embryos lacking both maternal and zygotic rumi
function raised at 28o
C have a neurogenic phenotype.