Fig. 2.

Presence of nad2 can be detected in at least five H. gammarus individuals collected from various European regions. a Linear gene organization comparison of the previous reported H. gammarus mitogenome with that reported in this study confirming the absence of nad2 in the original report in addition to substantial structural variation. The direction of arrow indicates transcription orientation. Orange, teal, purple and red arrows correspond to protein-coding genes, putative pseudogenes, rRNAs and tRNAs, respectively. b Circular comparison of the reconstructed mitogenomes showing significant nucleotide alignment across the entire newly assembled H. gammarus mitogenome with minor assembly gaps in the high-AT ribosomal rRNA regions (See Fig. 3e for details). c Sampling map of the fiveH. gammarus individuals with their exact location indicated by a star symbol