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The two harvestmen Dicranopalpus ramosus and Odiellus spinosus were first recorded from Denmark in 2007 and 2006, respectively. Two nation-wide surveys of the species in urban habitats were conducted in 2010 and 2017 providing information on their initial colonization and subsequent establishment and spread. By 2017, D. ramosus occurred in all parts of Denmark and was a frequent and abundant species in most of Jutland. On the Danish islands, the species was present but much less frequent. Odiellus spinosus occurred sporadically in eastern Jutland and more frequently on the islands. During the early years, new records of both species came from spaced-out locations, indicating arrival by long-distance jump dispersal possibly by independent colonisations from abroad and most probably mediated by human traffic. The range expansion of D. ramosus in northern Europe has occurred with a speed of 35–100+ km per year.

Two Mediterranean Auchenorrhyncha species, the planthopper Latilica maculipes (Melichar, 1906) and the leafhopper Synophropsis lauri (Horváth, 1897) are reported for the first time from Hungary. With 2 figures

Records of the short-tailed whipscorpion Stenochrus portoricensis Chamberlin, 1922 (Schizomida: Hubbardiidae) from greenhouses in North Rhine-Westphalia are presented together with detailed diagnostic drawings of the species. Stenochrus portoricensis is native to southern North America and the Caribbean and is the most commonly introduced species of Schizomida in Europe. In Germany the species has only been recorded previously from Hesse. A review of all introduced schizomid records in Europe reveals that S. portoricensis is currently the only species that occupies habitats outside of greenhouses. [ABSTRACT FROM AUTHOR]

The American linyphiid spider Erigone dentosa O. Pickard-Cambridge, 1894, was found in a plant market garden in the city of Zeitz (Saxony-Anhalt). It is the first record of this species for the German fauna. The author has been observing the spider assemblages of this plant nursery by irregular sampling for the last twenty years. Erigone dentosa was firstly caught by hand in February 2020, until September 12 specimens were recorded. It is unknown, how this species has reached the plant nursery. A total of 68 spider species and three harvestmen species was found, seven of them are alien species. [ABSTRACT FROM AUTHOR]

This is the first detailed contribution on the arachnid fauna from heated greenhouses in the Botanical Garden of the P.J. Šafárik University in Košice (Slovakia). Over ten years 62 spider taxa in 21 families were found. Two spiders, Mermessus trilobatus (Emerton, 1882) and Hasarius adansoni (Audouin, 1826), were recorded in Slovakia for the first time. Another interesting record was the cellar spider Hoplopholcus sp. and a new locality for the exotic spiders Coleosoma floridanum Banks, 1900 and Triaeris stenaspis Simon, 1891 was discovered. Additionally, a short survey of other arachnids (except Acari) was done. A single specimen of a provisionally identifiable palpigrade species (cf. Eukoenenia florenciae), one harvestmen species, Opilio canestrinii (Thorell, 1876), and four pseudoscorpion species were recorded. The rare pseudoscorpion species Chthonius ressli Beier, 1956 was collected for the second time in Slovakia.

Our macrozoobenthon samplings carried out in the Eger stream during 2015–2016 resulted in recording an alien species Marisa cornuarietis (Linneaus, 1758) the giant ramshorn snail which has not been reported so far from outdoorwaters in Hungary. Here we report on collecting several specimens from the urban section of the stream close to the outflow of the Eger thermal spa.

The composition of microcrustacean fauna was investigated in different water bodies of Gemenc-Béda-Karapancsa Floodplains with special regard to the distribution of alien and rare taxa. Between 2002 and 2013 101 taxa (57 Cladocera, 27 Copepoda, 17 Ostracoda,) were recorded from the water bodies with differing degrees of connectivity to the main river (eu-, para-, plesio- and paleopotamon). 18 species are reported for the first time from the area of Danube-Drava National Park and among them Daphnia ambigua, Pleuroxus denticulatus and Eurytemora velox are allochtonous species in Hungary. E. velox and P. denticulatus have persistent populations in the area, but their contribution to floodplain biodiversity is still not significant. Daphnia ambigua has only local and temporal populations and its presence is confined to the disconnected side of the floodplain. The abundance of thirty species was very low and their distribution pattern in the floodplain is different. The microcrustacean diversity of the plesiopotamal side arms is remarkable, particularly in the Nyéki-Holt-Danube.

In December 2018 the fire department recovered an exotic spider from a supermarket. The species was identified as the Mediterranean sparassid Olios argelasius (Walckenaer, 1806), which is native neither in the tropics nor in Central Europe. [ABSTRACT FROM AUTHOR]

Since about the year 2000 a hitherto unidentified species of the genus Leiobunum C. L. Koch, 1839, has rapidly invaded central and western Europe. Records are known from The Netherlands (probably the country of first occurrence in Europe), Germany, Austria and Switzerland. This introduced species, until now, mainly inhabits walls of buildings and rocky environments. Adults characteristically aggregate during daytime into groups of up to 1.000 individuals. The species is described and details on its present distribution, habitat preference, phenology and behaviour are presented.