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The fauna of terrestrial Parasitengona was studied in a human-transformed habitat, located on the Odra River shore in Wrocław agglomeration, and compared with that observed in natural habitats. The anthropogenic influence did not markedly affect the species diversity due to the presence of microhabitats which created favourable conditions for the mites. Altogether 13 species, representing four families and constituting almost nine percent of the Polish fauna of Parasitengona terrestria, were found within the studied area of ca. 200 m2. Species composition, compared with that observed in undisturbed habitat, differed with respect to nine taxa. Data on biology and ecology of the examined taxa are provided. The results of laboratory experiments allow for synonymization of Hauptmannia brevicollis Oudemans, 1910 with Abrolophus norvegicus (Thor, 1900) and Hauptmannia pseudolongicollis Haitlinger, 1987 with Abrolophus quisquiliarus (Hermann, 1804).
A redescription of Leptus phalangii (De Geer, 1778) (= L. nemorum (C. L. Koch, 1836), syn. nov., = L. beroni Fain, 1991, syn. nov.) based on adults, deutonymphs and larvae, is supplemented with data on life cycle and ecology of the species. Larvae of L. phalangii developed, under laboratory conditions, into deutonymphs of L. nemorum, species hitherto known only from active postlarval forms. A field-collected female of L. phalangii is designated as the neotype.
Hitherto data on ecological relations between terrestrial Parasitengona mites and ants are summarized and supplemented with the characteristics of two observed cases, which confirm the specific feeding adaptations of some Erythraeidae. Altogether, 21 species representing six Parasitengona families have been recorded as displaying permanent, temporary or accidental relationship with ants. Of those only the parasitic larvae of Forania mentonensis (André, 1929), F. sendrai Mayoral et Barranco, 2010, Makolia crimeaensis Saboori, Khaustov et Hakimitabar, 2009, Leptus clarki Southcott, 1989 and L. debeauforti (Oudemans, 1905) may be regarded as specialists. The verified diagnosis of M. crimeaensis, based on the material originating from Crimea (Ukraine) is proposed.
The results of experimental rearing of Neotrombicula inopinata and Leptotrombidium russicum and of field studies aiming at finding the hitherto unknown habitats occupied by active postlarval forms are presented. Diagnoses of deutonymphs reared from field-collected larvae of both species are provided. Literature interpretation of deutonymph of N. inopinata is inconsistent with the characteristics of deutonymph of N. inopinata obtained from larvae by experimental rearing. Larvae of L. russicum and L. silvaticum can be separated only on the base of host spectrum. Considering the biology of the parasite and host species, it is likely that postlarval forms of bat-parasitizing species may be confined to tree and cave habitats, whereas those species that are known as parasites of rodents inhabit the soil habitats.
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