Tuparezetes: A hairy mite with a penchant for hairy leaves

Tuparezetes nymph - Scale bar = 0.1 mm

Tuparezetes nymph – Scale bar = 0.1 mm

Oribatid mites are a dominant component of the microfauna of forest soils throughout the world, but they also climb trees. The last post’s Neotrichozetes is one such arboreal beastie as is this week’s Tuparezetes. One clue to its arboreal life style is the globular head of the sensillus (what oribatid workers call the bothridial seta in a trichobothrium). Another is the long stiff-haired look.

Tuparezetes nymph dorsal view - Scale bar = 0.1. mm

Tuparezetes nymph dorsal view – Scale bar = 0.1. mm

These shots are of an immature Tuparezetes, probably a tritonymph. All stages can be found on shrubs and trees with densely hairy leaves in cool temperate to tropical rainforests in eastern Australia and in New Zealand where they graze on fungi growing among the hairs. The genus was described by AV Spain in 1969 and the type species, Tuparezetes christineae, was collected from Leatherwood or Tupare (hence the generic name): Olearia colensoi, a kind of shrubby daisy in the subalpine zone of New Zealand. He also described a second species, Tuparezetes philodendrus, from Nothofagus solandri and Olearia lacunosa.  In Australia, I collected the genus (probably undescribed species) from Blanketleaf (Bedfordia arborescens) in cool temperate rainforest in Victoria, from canopy fogging in subtropical rainforest in Lamington National Park and from an unidentified tropical rainforest tree near Paluma in Queensland.

Adult Tuparezetes showing wax cap (modified from Hunt et al. 1998).

Adult Tuparezetes showing wax cap (modified from Hunt et al. 1998).

I’ve always considered Alister Spain’s descriptions a model of how a taxonomic paper should be. As well as a detailed morphological analysis the genus and species are based on numerous collections and there is a section on the ecology of  each species including the identification of fungal species found in gut contents. In not sure that I agree with Alister’s explanation for the most bizarre feature of this mite, though – the deep waxy crest present between the dorsal setae. He suggests this is an arboreal adaptation related to water balance, but the hairy leaves that this mite inhabits should have a well developed boundary layer and good humidity retention even in high winds. Still, I have no better hypothesis to offer.

References

Hunt, G., Colloff, M.J., Dallwitz, M., Kelly. J. & Walter, D.E. 1998. An interactive key to the oribatid mites of Australia. CSIRO Publishing, Collingwood, Victoria. (Compact Disk and User Guide).

Spain AV. 1969. A new genus and two new species of arboreal Oppiidae (Acari: Cryptostigmata) from New Zealand. Pacific Insects 11: 155-163.

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4 Responses to “Tuparezetes: A hairy mite with a penchant for hairy leaves”

  1. Dac Crossley Says:

    Thanks, Dave, nice blog. It is somewhat surprising, the number of soil species that will climb up into the vegetation. Are they suitable prey for the mite predators that hang out on the foliage? I’m sure that ants can find them.

  2. Expiscor (17 June 2013) | Arthropod Ecology Says:

    […] Hairy Mites! Macromite has a new post up.  […]

  3. Bevan Says:

    Hi Dave ,,
    Do you have more pictures please.

    Kind Regards
    Bevan

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