Please use this identifier to cite or link to this item: http://hdl.handle.net/1946/5339
Icelandic groundwater amphipods survived the glaciations in refugia forming new endemic species such as Crangonyx islandicus and Crymostygius thingvallensis. However a strong evolutionary pressure has led to a morphological convergence that makes difficult a clear taxonomy classification within this group. The aim of this study is twfold, firstly to assess the position of these species within the superfamily Crangonyctoidae,and secondly to assess and compare the phylogeography of of C. islandicus using different fragment sizes (420 and 1200 base paires) of the 16S rRNA gene. A taxonomy of the family Crangonyctoidea using the 16S gene differs from the one based on morphology. A higher variation rate was found along the 1200bps fragment due to a faster evolutionary rate, than in the smaller region.