Fig. 1

Landscape of the complete Antarctic krill mitogenome. a Circular map of the Antarctic krill mitogenome. The inner circle represents GC content (%), while the middle circle represents the percentage identity between our assembly and the published mitogenome (NC_040987.1) using non-overlapping 100 bp sliding windows. Boxes inside and outside the outer circle represent genes on the major coding and minor coding strands, respectively, with colors indicating gene functions. The directions of the arrows show the transcribed orientation from 5’ to 3’. b Self-alignment synteny of our assembled mitogenome. Green and red lines represent forward and reverse alignments, respectively. A tandem repeat of 13.8 repeats with 166 bp repeat units was observed in the CR (control region). c Synteny between our assembly and the published mitogenome. Green and red lines represent forward and reverse alignments, respectively. d Comparative analysis of mitogenomes among krill and the closely related species. The left panel shows the phylogenetic tree, and the right panel illustrates the organization of mitochondrial genes. Saropogon luteus is used as an outgroup, representing the ancestral mitochondrial gene order. Translocations are represented by green lines, and inverted translocations in red lines