An interesting endemic genus, with the male having a conspicuously elongated abdomen.
Stout, green, sluggish. T. tipulata feeds on native tree foliage. T. topea can feed on matai.
Pupates in a cocoon on ground detritus.
Greenish wings. Male has elongated abdomen (Tatosoma means 'long body') that likely evolved to impress the female during courtship. September to March. Rests on mossy tree trunks by day. Flies at night, attracted to light.