This is the first part of a multivolume monograph dealing with the about 400 species of springtails (Collembola) which are known to occur in the Nordic countries, including the Arctic Islands. Volume 1 contains richly illustrated identification keys and full descriptions of 161 species of the section Poduromorpha. The geographical distribution and the preferred natural habitats of the species are summarised.
New morphological concepts in species diagnostics are introduced, in particular concerning the mouthparts' morphology which greatly aids in precise identification of the many difficult species of the family Onychiuridae.
The book will be indispensable to everyone working with springtail identification in northern Europe. The introduction of new diagnostic characters will be of universal interest to any Collembola taxonomist.
This volume completes the survey of the ca. 400 species of springtails, which can be found in Finland, Sweden, Norway, Denmark, Iceland, the Faroes and the Arctic Islands and includes the sections Entomobryomorpha and Symphypleona. The first volume, published in 1998, covered Poduromorpha. Identification keys and full descriptions of the species are richly illustrated by line drawings. Photos are provided for some species displaying characteristic patterns of pigmentation. New diagnostic characters, including sensillary chaetotaxy and details of the mouth apparatus, are introduced.
With the appearence of this book soil scientists and the interested amateur have now a modern tool to identify all species of Nordic springtails. In addition the habitat preferences and geographical distribuition are summarised. The book will be of general interest to everyone working on springtail identification.
The paper includes the following species: Isotoma antennalis (Bagnall, 1940), I. blufusata Fjellberg, 1978, I. divergens Axelson, 1900, I. fennica Reuter, 1895, I. germanica Hüther & Winter, 1961, I. hiemalis Schött, 1893, I. infuscata (Murphy, 1959), I. nanseni Fjellberg, 1978, I. neglecta Schäffer, 1900, I. nivea Schäffer, 1896, I. olivacea Tullberg, 1871, I. propinqua Axelson, 1902, I. ruseki n.sp., I. tigrina (Nicolet, 1842), I. tshernovi Martynova, 1974 and I. violacea Tullberg, 1876. A key for separation of the species is given.
The following four species are redescribed on the basis of recently collected material: Pseudanurophorus inoculatus Bödvarsson, 1957 (Swedish Lappland, North Norway, Greenland), Isotomodella pusilla Martynova, 1967 (South Norway, Swedish Lappland), Vertagopus arcticus Martynova, 1969 (Swedish Lappland), and Proisotoma subarctica Gisin, 1950 (Swedish Lappland, North Norway). The species of Isotomodella and Vertagopus are reported for the first time from Europe. A lectotype of P. inoculatus is designated.
Vertagopus pseudocinereus n.sp. is described from specimens collected under bark on dead Pinus silvestris and Betula pubescens at Pasvik, Finnmark County, North Norway. The species was also observed on imported timber at Spitsbergen. The morphological difference from V. cinereus (Nicolet) mainly the absence of ventral setae from the thora and second abdominal segment. Male V. pseudc cinereus are dimorphic with shortened abdomina macrochaetae in the reproductive phase.
Five species and two genera of Odontellidae are reported from the Canary Islands. Two species are described as new: Axenyllodes microphthalmus sp. n. and Axenyllodes nematodes sp. n. A supplementary description is given to Pseudostachia populosa (Selga).
Vertagopus sarekensis (Wahlgren) was found on dry localities in alpine region in Northern Norway and Swedish Lappland, where it ascends to the highest mountain tops (2000 m a.s.l.). It is separated from V. westerlundi (Reuter), besides in colour, by morphological details of antenna, number of ventral setae of thorax and abdomen, shape of mucro and general clothing. Adults in reproductive phase show a distinct sexual dimorphism: Abdominal macrochaetae of the male are much shorter and thicker than in the female, and setae of the characteristically swollen frons are thick and thorn-like. A lectotype of V. sarekensis is designated.
Isotoma notabilis Schäffer, I. agrelli Delamare and I. ekmani nom. nov. are easily separable by differences in the maxillary lamellae. I. ekmani is reported from Arctic Canada, Greenland and alpine habitats in Sweden and Norway. I. agrelli has been found in France and Norway. The distribution of I. notabilis is cosmopolitan.
15 new species from North America are described: I. alaskensis n. sp. (Alaska), I. atkasukiensis n. sp. (Alaska), I. blufusata n. sp. (Holarctic), I. christianseni n. sp. (Illinois), I. creli n. sp. (Alaska), I. inupikella n. sp. (Alaska), I. komarkovae n. sp. (Alaska), I. macleani n. sp. (Alaska), I. manitobae n. sp. (Manitoba), I. maxillosa n. sp. (Illinois), I. nanseni n. sp. (Holarctic), I. nixoni n. sp. (Alabama, Indiana, Kentucky), I. randiella n. sp. (Illinois), I. taigicola n. sp. (Alaska) and I. torildae n. sp. (Illinois). The systematic characters are briefly discussed. In particular the morphology of the antennae, labrum, maxillae, ventral tube and furca were found useful. Cyclomorphosis (occurrence of distinct summer and winter forms) was found in I. blufusata n. sp., I. neglecta Schäffer and probably I. inupikella n. sp. A key for separation of the new species and some related ones is given. All the new species belong to the subgenus Desoria Nicolet, 1841.