The thrips constitute thysanoptères ( Thysanoptera ). They are Insecte S Ptérygote S Hétérométabole S of size lower-case, with the lengthened body. The number of known species exceeds the 5000 distributed in more than 850 kinds. They are usually called the " animals of orage".

Morphology

These insects have a reduced size often lower than 2 Misters They are equipped with 4 lengthily fringed narrow wings and asymmetrical sucker piqueuses parts oral.

Head

Ocellar silks, ocellar silks post: 3 pairs generally. Pairs I and II are smaller, more developed pair III. Pair I, in front of the ocelles ones, is often absent. Pairs II and III are on the same plan. There are always 3 ocelles laid out in triangle. The position of silks compared to the ocelles ones (inside or outside the triangle) is a criterion of determination. Ocellar silks post are placed on the back of the head and generally laid out on the same line. They are sometimes absent, and of variable size.

  • Palpus jawbone: includes/understands 2 or 3 segments.

  • Antennas:

    • the number of segments (from 6 to 9) and their relative color.
    • the shape of the sensory cones on segments 3,4 and 6. (simple, fourchus).
    • If the base of the sensory cone is broad: Odonthothrips .

Thorax

  • Prothorax :
    • the number and position of large silks on the margins former and posterior of the pronotum.
      • Si of large silks is present only at the back: kind Thrips .
      • Si of large silks is present at before and with the back: kind Frankliniella , Kakothrips .
  • Méso-Métathorax :
    • the presence or the absence of spinula.
    • the shape of the forks of the méso and métathorax.
    • the shape of the drawings of the métanotum (reticulation).
    • the presence or the absence of the campaniform sensilles (small even opening).

  • Wings:

    • They are bordered of rows of large silks. The wing nervation is always reduced. It includes/understands costal, a principal vein and a secondary.
      • the presence of tinted parts (case of the Aeolothrips ).
      • veins: the absence of vein indicates Tubulifère.
      • the position and the number of silks of the principal vein on the distal part of the wing.

Abdomen

The abdomen always includes/understands 10 segments. A segment includes/understands a tergite dorsalement, laterally the pleurotergite and ventralement a sternite. One particularly observes comprising segment VIII of the characteristic bodies.

  • Tergite VIII:

    • the comb, position and the shape of silks which constitute it.
    • the relative position of the spinacle and the cténidies.

  • Pleurotergites :

    • sculptures.
    • the presence or the absence of microtriches.
    • the number and the position of silks.

Biological features common to the order of the thysanoptères

90% of the known species are Phytophage S

Conservation of the specimens

The samples of Thrips are preserved in alcohol at 10° added with a dampener during 15 days in order to obtain insects with the slack body and the legs and well spread out wings. The well melanized species are cleared up with potash with 10% then washed before dehydration and assembly.

Classification of Tysanoptera

The determination of Thysanoptères is done starting from the females. Their size varies between 1 and 2,5 mm and their color vary clear yellow with brown dark according to the species. The male smaller, thinner, often more clearly, are deprived of drill and the 9 and 10th segments abdominal often carry ornamentations. The following characters are most frequently used:

  • TEREBRANT

    • THRIPIDAE
      • Panchaeothripinae
        • Retithrips
        • Panchaetothrips
        • Hercinothrips
        • Astrothrips
        • Helionothrips
        • Heliothrips
        • Parthenothrips
        • Selenothrips
      • Thripinae
      • Dendrothripini
        • Dendrothrips
        • Pseudodendrothrips
        • Leucothrips
      • Sericothripini
        • Drepanothrips
        • Scirtothrips
        • Sericothrips
      • Chirothripini
        • Chirothrips
        • Limothrips
      • Thripini
        • Anaphothrips
        • Apterothrips
        • Scolothrips
        • Aptinothrips
        • Belothrips
        • Pseudanaphothrips
        • Chaetanaphothrips
        • Dicromothrips
        • Oxythrips
        • Tmetothrips
        • Baliothrips
        • Bolacothrips
        • Ceratothrips
        • Frankliniella
        • Kakothrips
        • Corynothrips
        • Mycterothrips
        • Odontothrips
        • Megalurothrips
        • Sorgothrips
        • Plesiothrips
        • Florithrips
        • Platythrips
        • Microcephalothrips
        • Scolothrips
        • Taeniothrips
        • Thrips
        • Fulmekiola
        • Stendaetothrips
    • AEOLOTHRIPIDAE
        • Franklinothrips
        • Aeolothrips
        • Melanthrips
        • Rhipidothrips
        • Ankothrips
    • MEROTHRIPIDAE
        • Merothrips
    • HETEROTHRIPIDAE
        • Heterothrips
  • TUBULIFERES
    • PHLAEOTHRIPIDAE
        • Bolothrips
        • Cryptothrips
        • Megalothrips
        • Megathrips
        • Raphidothrips
        • Abiastothrips
        • Acantothrips
        • Cephalothrips
        • Gynaikothrips
        • Haplothrips
        • Hoplandrothrips
        • Hoplothrips
        • Liothrips
        • Phlaeothrips
        • Poecilothrips

See too

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