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All juvenile stages of Limnozetes ciliatus (Schrank, 1803) and deuto- and tritonymph of L. palmeme Behan-Pelletier, 1989 are redescribed and illustrated, and the larva and protonymph of L. palmerae are described and illustrated for the first time. Both species are similar with respect to the body shape, but differ mainly in the shape of some setae in the juveniles, presence of aggenital setae, formula of genital setae, and sculpture of cerotegument in the adult. Relations of species within Limnozetes Hull, 1916 are discussed, and keys to the larvae and nymphs of four European species of this genus are provided.
The morphology of juvenile stages and ontogeny of Heterozetes palustris (Willmann, 1917) and Zetomimus furcatus (Pearce & Warburton, 1906) are redescribed and illustrated. The juveniles of the former species have most prodorsal and gastronotal setae long, and smooth integument with microtuberculate cerotegument, while those of the latter species have most prodorsal and gastronotal setae short, with three pairs of longer and thicker setae in the posterior part of gastronotum, tuberculate integument, and two darker stripes, transverse and longitudinal, in the shape of letter T, with microtuberculate cerotegument. Most of nymphs of Z. furcatus bear one scalp, and rarely 2-3 scalps of previous instars that adhere to the gastronotum, which is observed here for the first time. The adults of both species have several morphological characters of Ceratozetoidea, while their juveniles lack a humeral organ and distinct sclerites, which occur in most Ceratozetoidea.
Juvenile stages of Punctoribates punctum (C. L. Koch, 1839) and P. hexagonus Berlese, 1908 are redescribed, those of P. sellnicki Willmann, 1928 are described for the first time, and both juveniles and adults of all species are illustrated. The juvenile stages of these species are similar in body shape and the number of setae on the prodorsum, gastronotum and anal, anogenital and epimeral regions, but differ in the shape and length of some prodorsal and gastronotal setae. Keys to the larvae and nymphs of these species are prepared.
The morphology of juvenile stages of Parachipteria bella (Sellnick, 1928) and P. willmanni Hammen, 1952 is described and both these and adults are illustrated. The respective juvenile stages of P. bella are smaller than those of P. willmanni. In P. bella the anterior region of the prodorsum is distinctly reticulated, but that of P. willmanni is not. In P. bella the gastronotal setae, especially those of the d- and l-series, look relatively longer and thicker than in P. willmanni. Keys to the juveniles and adults of Parachipteria bella, P. willmanni, Achipteria coleoptrata (Linnaeus, 1758) and A. nitens (Nicolet, 1855) are proposed.
The morphology of juvenile stages and ontogeny of Scheloribates holsaticus (Weigmann, 1969), S. initialis (Berlese, 1908), and S.palliduhis (C. L. Koch, 1841) were investigated. The juveniles of these species have excentrosclerites at similar gastronotal setae (c₂, la, lp, and h₁ in larva, and c₂, la, lp, h-series, and p₁ in nymphs), and solenidion to, on tarsus I strongly curved outwards, which are typical of Scheloribatidae, but they differ by body size and the shape of most gastronotal setae. The successive juvenile stages of S. holsaticus are the largest, while those of S. pallidulus are the smallest. The former species has most gastronotal setae barbed, while S. initialis and S. pallidulus have them smooth. The latter species has these setae thinner and more curved than other species, and pliable in distal parts. The adult of all these species have notogastral sacculi, but S. holsaticus has 13 pairs of notogastral setae, including pairs c₂ and d-series, while other species have 10 pairs of setae, including pair c₂.
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