The eco-morphological adaptation of the pupal stages of some Polish Thripidae has been investigated in the laboratory. The propupa and pupa of species developing in grass inflorescences or in narrow cravices of leaf sheaths (Chirothrips pallidicornis, Iridothrips iridis) are characterized by shorter setae and smaller abdominal thorns than species developing on leaf blades or in flowers (Frankliniella tenuicornis, F. intonsa, Pezothrips dianthi, Thrips fulvipes, T. fuscipennis, T. menyanthidis, T. physapus, T roepkei, T. sambuci, T. simplex). Species feeding on monocots pupate and molt on their hosts as do the folicolous species feeding on dicots. In contrast, the floricolous ones feeding on dicots drop off the hosts and develop in the soil. Variation in the shape of the abdominal apical projection of the pupal stages of the female are described.
Middle-eastern Poland is a region with the best-recognised fauna of thrips in comparison with the remaining area of the country. A list of threatened thrips species (Thysanoptera, Insecta) of this region is given with 44 species divided in five extinction-risk categories. The criteria used for classification into particular categories are based on data about frequency of species occurrence, area of occupancy, fragmentation of sites and presence of their host plants. One,
, was classified as critically endangered, eleven species as endangered, nine as vulnerable, fifteen as species of near threatened and eight belong to the least concern group. Most of the species occur on only one locality or have a fragmented distribution, their extinction is mainly a result of the disappearance of their host plants and habitat destruction. Nine species are also mentioned on red lists of the neighbouring countries the Czech Republic and Germany. Of these only
is threatened in all three countries, yet.