Parisotoma notabilis is the most common species of Collembola in Europe and is currently designated as ubiquist. This species has been extensively used in numerous studies and is considered as well characterized on a morphological ground. Despite the homogeneity of its morphology, the sequencing of the barcoding fragment (5′ end of COI) for several populations throughout Europe and North America revealed four distinct genetic lineages. The divergence found between these lineages was similar to the genetic distance among other species of the genus Parisotoma included in the analysis. All four lineages have been confirmed by the nuclear gene 28S. This congruence between mitochondrial and nuclear signals, as well as the geographical distribution pattern of lineages observed in Europe, supports the potential specific status of these lineages. Based on specimens from the type locality (Hamburg), the species name was successfully assigned to one of these lineages. This finding raises several problems as Parisotoma notabilis has been widely used in many ecological studies. Accumulation of new data for the different lineages detected, especially ecological information and life history traits, is needed to help resolve this situation.

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Phylogeny of the Brachystomellidae (Collembola) -were the mandibles ancestrally absent and did they re-appear in this family? -Zoologica Scripta, 34, 305-312. A phylogenetic study was carried out on the family Brachystomellidae, which was found to be monophyletic. The genera Brachystomella and Folsomiella were polyphyletic. Folsomiella nothofagutalis was removed from Folsomiella and placed in Neorganella . The analysis showed that mandibles were ancestrally absent in this group and then re-appeared later in Probrachystomellides nicolaii .

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