The quill mites are from the family Syringophilidae. Although little is known about these parasitic mites, 33 species have been discovered, most prevalently in North America. They are all ectoparasites and they are usually found in birds from the order Passeriformes (comprising approximately 32 specific bird species). Their life cycle is simple since they are monoxenous organisms that sexually reproduce and eat within the feather of their hosts.
The genus Syringophilopsis is one of the most diverse of this family with over 33 identified species. Females have harpoon finger-like digits in their chelicerae, three teeth in their hypostomal apex which is ornamented by 1 or 2 protuberances. In males, the hysteronotal shield can be present, absent, free or fused. Both genders possess a propodontal shield and they are both relatively large in comparisons of other mites in the family Syringophilidae.