Flat Mites of the World


Key characters

  • c2, d2, e2, f2 absent (Figs. 1, 2, 3)
  • v2, sc1, c1, d1, e1 minute (Figs. 1, 2)
  • sc2, f3 extremely elongate (Figs. 1, 2, 3); held at right angles to body when alive (Fig. 4)
  • h2 not elongate
  • body extremely flat (Fig. 4)
  • anterior margin of prodorsum with forked projection
  • ventral, genital and anal plates not developed (Figs. 5-6)
  • 3 pairs ps setae (Figs. 5-6)
  • 4 segmented palp; solenidion inserted at base of palp tarsus not at tip

Similar taxa

Tenuipalpus - has seta h2 elongate; setae sc2, f3 similar to other dorsal setae

Ultratenuipalpus sensu stricto - no dorsal setae elongate

Number of species

One - U. bunyai


Mesa, Ochoa and Evans




Araucaria bidwilli (Araucariaceae)


  • bright red with some black markings when alive; dorsal setae white (Fig. 6)
  • eggs red


Seta f3 is not elongate in the larvae.


Fig. 1. Urigersonus bunyai female dorsum (after Smiley & Gerson 1995).


Fig. 2. Urigersonus bunyai female dorsum (image: Gary Bauchan, USDA-ARS).


Fig. 3. Urigersonus bunyai female dorsum.


Fig. 4. Urigersonus bunyai female live.


Fig. 5. Urigersonus bunyai female venter, with detail of genital region.


Fig. 6. Urigersonus bunyai female venter, detail of genital region (image: Gary Bauchan, USDA-ARS).