Bryobiinae

t

Taxonomy

Common names

clover mites

Probability of encounter

medium

Quarantine importance

Medium. The genus Tetranycopsis has few economically important pests. Fewer than 10 species are described and most do not infest agricultural crops.

• T. zambezianus feeds on soybean and cotton in parts of southern Africa and Madagascar.
• The hazelnut mite T. horridus (C&F) is a pest of filberts in Europe, Asia, and Oregon and also feeds on yarrow, walnut, spruce, pine, red cedar, and beans.

Diagnosis

• Claws and empodium pad-likepad-like:
  in Prostigmata, used to refer to empodia that do not have a distal hook (claw-like); when tenent hairs are present a 'pad-like' empodium may look more like a pincushion; in other Acari, usually a simple, pad-like empodium.
  
• Prodorsumprodorsum:
  the dorsal surface of the propodosoma.
  with 4 pairs of setaeseta:
  (pl. setae, from L. = bristle) cuticular process composed of a hollow shaft (sometimes filled with a refractive material) produced from a membranous socket (the alveolus); the hair-like, spine-like, branched or variously expanded structures on the surfaces of the legs and body.  Most setae function as mechanoreceptors, but others (e.g., solenidia) are chemoreceptors or have unknown or ambiguous functions.
  (vi, ve, sci, sce); without prominent lobes over the gnathosomagnathosoma:
  (= capitulum) the anteriormost part of a mite or ricinuleid, composed of the cheliceral and pedipalpal segments and separated from the body (idiosoma) by a ring of soft cuticle.
  .
• Opisthosomaopisthosoma:
  (= abdomen) the posterior body division in arachnids; usually not distinct in mites because of the fusion of the opisthosoma with part of the prosoma to form the idiosoma.
  with 12 pairs of setaeseta:
  (pl. setae, from L. = bristle) cuticular process composed of a hollow shaft (sometimes filled with a refractive material) produced from a membranous socket (the alveolus); the hair-like, spine-like, branched or variously expanded structures on the surfaces of the legs and body.  Most setae function as mechanoreceptors, but others (e.g., solenidia) are chemoreceptors or have unknown or ambiguous functions.
  (c1–3, d1–3, e1–3, f1–2, h1)

Similar taxa

The true spider mites in the Tetranychinae do not have empodiaempodium:
(pl. empodia) an unpaired structure arising between the tarsal claws, ranging from pad-like to claw-like and often bearing structures such as tenent hairs, dense setulae, or taking the form of a featherclaw (Eriophyoidea)..
with tenent hairs. Either the claws or the empodiaempodium:
(pl. empodia) an unpaired structure arising between the tarsal claws, ranging from pad-like to claw-like and often bearing structures such as tenent hairs, dense setulae, or taking the form of a featherclaw (Eriophyoidea)..
are hooked in other tribes of Bryobiinae.

References

• Baker and Pritchard 1960Baker and Pritchard 1960:
  Baker EW, Pritchard AE. 1960. The tetranychoid mites of Africa. Hilgardia 29 (11): 455–574.
• Baker and Tuttle 1994Baker and Tuttle 1994:
  Baker EW, Tuttle DM. 1994. A guide to the spider mites (Tetranychidae) of the United States. Indira Publishing House, West Bloomfield, Michigan. 347 pp.
• Bolland 2001Bolland 2001:
  Bolland HR. 2001. Mites (Acari: Tetranychidae and Phytoseiidae) from the Tatra Mountains in Slovakia, with special remarks on Tetranycopsis hystriciformis Reck. International Journal of Acarology 27 (3): 225–227.
• Bolland et al. 1998Bolland et al. 1998:
  Bolland HR, Gutierrez J, Flechtmann CHW. 1998. World catalogue of the spider mite family (Acari: Tetranychidae). Brill, Leiden.
• Helle and Sabelis 1985Helle and Sabelis 1985:
  Helle W and Sabelis MW, eds. 1985. Spider mites: Their biology, natural enemies, and control. World Crop Pests, Vol. 1A. Elsevier, New York.
• Jeppson et al. 1975Jeppson et al. 1975:
  Jeppson LR, Keifer HH, and Baker EW. 1975. Mites injurious to economic plants. University of California Press, Berkeley.