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Tetranychinae—Key feature pages

Tarsus I duplex setae

In most true spider mites tarsustarsus:
(pl. tarsi) the subdistal leg segment between the tibia and the pretarsus (apotele).
 I has 2 duplex setalsetal:
of or pertaining to a seta.
 complexes—a large solenidionsolenidion:
(pl. solenidia) a hollow, optically inactive chemosensory seta on the limbs of acariform mites appearing to have transverse rows of minute pores (actually pore canals) under light microscopy, (the transverse pattern is often not apparent in SEM); often bulbous or otherwise modified; sometimes associated with a companion seta.  Solenidia are designated with Greek letters by leg segment: Ω (omega) on the tarsus, Φ (phi) on the tibia, and Σ (sigma) on the genu.
 (omegaomega:
(Ω) designation for solenidion the tarsus of acariform mites (Φ (phi) on the tibia, and Σ (sigma) on the genu).
 prime & omegaomega:
(Ω) designation for solenidion the tarsus of acariform mites (Φ (phi) on the tibia, and Σ (sigma) on the genu).
 double prime) closely inserted next to a small guard seta (ft prime & ft double prime):

  • In Eotetranychus Schizotetranychus, Panonychus, and Allonychus the duplex setaeduplex setae:
    a pair of setae or a seta and a solenidion sharing the same insertion.
     are inserted past the midpoint of the tarsustarsus:
    (pl. tarsi) the subdistal leg segment between the tibia and the pretarsus (apotele).
     and close to each other.

  • In Oligonychus the duplex setaeduplex setae:
    a pair of setae or a seta and a solenidion sharing the same insertion.
     are often said to be distaldistal:
    towards the free end of an appendage.
     and adjacent, but often only in the sense that they are more closely inserted than, for example, in Tetranychus.

  • In Amphitetranychus and Tetranychus the duplex setaeduplex setae:
    a pair of setae or a seta and a solenidion sharing the same insertion.
     are well separated and not inserted towards the anterior end of the tarsustarsus:
    (pl. tarsi) the subdistal leg segment between the tibia and the pretarsus (apotele).
    .

  • In the Eurytetranychini the duplex setaeduplex setae:
    a pair of setae or a seta and a solenidion sharing the same insertion.
     are loosely organized or absent.

Feature pages