Flies have a marked trident on the thorax. The phenotype is variable, slightly dominant and overlaps wild type. The scutellum, thorax and sternopleural plates are blackish.
Dark trident or streak on thorax. Scutellum and sternopleural plates also dark. Thorax often contains bubbles. Variable; overlaps wild type but also semidominant. RK3.
"tri32k", "tri33d27" and tri1 all from the same South Amherst stock.