Overall it resembles the living long-legged arachnids called harvestmen, such as the modern genus Phalangio, which are not classed as true spiders. The body is flattened and oval in shape, with a wide connection between prosoma and abdomen, instead of the narrow 'wasp waist' of true spiders. It is difficult to interpret their lifestyles, considering their extinction and the rarity and poor condition of their fossils. Their air-breathing organs suggest they were terrestrial, and their mourhparts were weak.