The early primary succession on a moraine near a melting glacier in southern Norway was analysed for abiotic and biotic driving forces, and for meaningful division into phases. Four successional phases were identified during the first eight years, during which a complex ecosystem developed. First year: Colonization of cold-adapted Collembola and establishment of terrestrial biofilm with diatom algae. One to three years: Rapid colonization of microarthropods and predatory macroarthropods. Three to six years: Pioneer mosses became common and fed several of the arthropods. Six to eight years: Ancient carbon released from the glacier was assimilated into the food web. In the succession process, abiotic and biotic driving forces acted together. Wind was a key force for the dispersal of several organisms into the virgin ground. Biofilm, mosses and ancient carbon were important driving forces as food sources. Certain cold-adapted arthropods, as well as arthropods preferring open ground, were forced to follow the retreating ice edge and gradually disappeared from the moraine. Good knowledge of the ecology of each species is necessary to understand early succession pattern.

The subfamily Xoridinae is a relatively small and rare group within the species rich family of Ichneumonidae. Xorides indicatorius (Latreille, 1906) is recorded from two hot-spot locations in southern Norway. A total of 12 species of Xorides are currently recorded from Norway.

Additions and corrections to the Nordic-Baltic Checklist of Lepidoptera (Aarvik et al. 2017) are presented. 42 species new to the Nordic-Baltic area as well as numerous new country records are added.

Hygrobates norvegicus (Thor, 1897), the type species of the subgenus Rivobates Thor, 1897 is redescribed, based on the syntypes harboured at the Museum of Natural History in Oslo and fresh material recently collected from various parts of Norway. The species is defined considering its morphological variability range and molecular data (CO1 sequences), bibliographical data published during the past 125 years are discussed. The synonymy of Hygrobates polyporus Piersig, 1898 With H. norvegicus is confirmed and H. norvegicus imminutus Maglio, 1909 is regarded a nomen dubium.

The yellow-faced bee Hylaeus signatus (Panzer, 1798) is reported from Norway. Five males and two females were sweep-netted in the Botanical Garden of Oslo [AK] 9 July 2024. The first record in Sweden was from the Botanical Garden in Stockholm in 1963. There are now records present from Skåne north to Uppsala (Uppland) and Krylbo (Dalarna), and the northwesternmost from Åmål (Vastergötland) around 146 km in straight line from Oslo. In Denmark H. signatus is reported from Svendborg at Funen (Fyn) 1918 and the Botanical Garden of Copenhagen (North East Zealand) in 2006 and 2008. There is a single record from Finland from the Botanical Garden of Helsinki (Nylandia) 1958. In Northern Europe, it is strictly associated with Reseda L. (Resedaceae Martinov), which is the only flower where the females gather pollen. All the Norwegian specimens were netted when visiting flowers of Reseda luteola L. The genus Reseda is represented in Norway with four non-native species, and at least two of them seem well established (i.e. R. luteola L. and R. lutea L.). H. signatus may have a predominantly rural distribution in Northern Europe where Reseda is found. These may be gardens, particularly botanical gardens, roadsides, ruderate areas, beaches, limestone areas or other abandoned places where Reseda has established. It is assumed that H. signatus has established itself naturally in Norway from Swedish populations but may have been present in a longer period. H. signatus is the 13th Hylaeus species in Norway, and with this addition the list of Norwegian bees (Apoidea, Apiformes) counts a total of 213 species.

Paramormia ustulata (Walker, 1856) is recorded from Shetland for the first time and a revised checklist of the Shetland Psychodidae is given. The Psychodidae fauna of Shetland is briefly compared With that of mainland Britain, Norway and the Faroe Islands.

We present five new records of soil oribatid mites, including four found in the Norwegian subarctic, in Finnmark: Chamobates voigtsi (Oudemans, 1902), Hermannia nodosa Michael, 1888, Kunstidamaeus nidicola (Willmann, 1936) and Oribatella sexdentata Berlese, 1916, and one found in Svalbard: Scutozetes arcticus Ermilov & Makarova, 2021. This paper presents details of these new records and comments on the known distribution and ecology of the species.

A total of 40 individuals from the family Pteromalidae from the insect collection at Tromsø Museum has been studied. The material was collected by Tron Soot-Ryen at 16 localities, mainly from northern Norway in the years 1922 to 1948. The findings include records of 23 species from three subfamilies, including six species recorded for the first time in Norway: Halticoptera polita (Walker, 1834), Lamprotatus claviger Thomson, 1876, Pteromalus cardui (Erdös, 1953), Pteromalus chlorospilus (Walker, 1834), Stictomischus scaposus Thomson, 1876 and Tomicobia promulus (Walker, 1840). Information about the distribution and biology of each species is provided.